From 31d681f715e61dd7be0d791bb449b4ebacbd9024 Mon Sep 17 00:00:00 2001
From: Jendrik Johannes <jendrik.johannes@gmail.com>
Date: Fri, 17 Jun 2022 13:21:08 +0200
Subject: [PATCH] Convert all samples to Groovy DSL

---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  2 +-
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-project/data-model/build.gradle        |  7 +++
 .../my-project/data-model/build.gradle.kts    |  7 ---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../main/groovy/my-java-application.gradle    | 11 ++++
 .../my-java-library.gradle}                   |  4 +-
 .../kotlin/my-java-application.gradle.kts     | 11 ----
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../main/groovy/my-java-application.gradle    |  7 +++
 .../src/main/groovy/my-java-library.gradle    |  7 +++
 .../kotlin/my-java-application.gradle.kts     |  7 ---
 .../main/kotlin/my-java-library.gradle.kts    |  7 ---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/build.gradle               |  3 ++
 .../my-build-logic/build.gradle.kts           |  3 --
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  2 +-
 .../my-java-base.gradle}                      | 14 ++---
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-other-project/build.gradle             |  3 ++
 .../my-other-project/build.gradle.kts         |  3 --
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 05_Lifecycle_Tasks/my-project/build.gradle    | 17 +++++++
 .../my-project/build.gradle.kts               | 17 -------
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  6 +--
 .../src/main/groovy/my-java-base.gradle       |  7 +++
 .../my-java-library.gradle}                   |  0
 .../src/main/kotlin/my-java-base.gradle.kts   |  7 ---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  8 +--
 .../src/main/groovy/my-java-base.gradle       |  7 +++
 .../my-java-library.gradle}                   |  0
 .../tasks/GenerateStartScript.groovy          | 36 +++++++++++++
 .../myproject/tasks/MyAppExtension.groovy}    |  2 +-
 .../src/main/kotlin/my-java-base.gradle.kts   |  7 ---
 .../myproject/tasks/GenerateStartScript.kt    | 35 -------------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      | 21 ++++----
 .../my-java-library.gradle}                   |  0
 .../my-root-project.gradle}                   |  2 +-
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      | 20 ++++----
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../src/main/groovy/metadata-rules.gradle     |  6 +++
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  4 +-
 .../my-java-library.gradle}                   |  0
 .../metadatarules/Slf4JImplRule.groovy}       |  7 +--
 .../src/main/kotlin/metadata-rules.gradle.kts |  6 ---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   | 15 +++---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  4 +-
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../main/groovy/my-java-application.gradle    | 22 ++++++++
 .../src/main/groovy/my-java-base.gradle       | 26 ++++++++++
 .../my-java-library.gradle}                   |  0
 .../kotlin/my-java-application.gradle.kts     | 22 --------
 .../src/main/kotlin/my-java-base.gradle.kts   | 26 ----------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 12 ++---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-android-application.gradle}            |  2 +-
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  4 +-
 .../my-java-base.gradle}                      | 29 +++++------
 .../my-java-library.gradle}                   |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-kotlin-multiplatform-lib.gradle}       |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle}     | 12 ++---
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  4 +-
 .../my-java-library.gradle}                   | 36 ++++++-------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 12 ++---
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      | 17 +++----
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 12 ++---
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  9 ++--
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 12 ++---
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  2 +-
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 20 ++++++++
 .../my-project-structure.settings.gradle.kts  | 20 --------
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               | 26 +++++-----
 .../my-java-base.gradle}                      | 16 +++---
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 20 ++++++++
 .../my-project-structure.settings.gradle.kts  | 20 --------
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  8 +--
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 20 ++++++++
 .../my-project-structure.settings.gradle.kts  | 20 --------
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../my-java-library.gradle}                   |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  | 12 ++---
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../main/groovy/my-java-application.gradle    |  4 ++
 .../src/main/groovy/my-java-base.gradle       | 23 +++++++++
 .../src/main/groovy/my-java-library.gradle    |  4 ++
 .../src/main/kotlin/my-java-base.gradle.kts   | 23 ---------
 .../my-build-logic/settings.gradle            |  4 +-
 .../structure-plugins/build.gradle            |  3 ++
 .../structure-plugins/build.gradle.kts        |  3 --
 .../my-project-structure.settings.gradle      | 20 ++++++++
 .../my-project-structure.settings.gradle.kts  | 20 --------
 .../my-project/app/build.gradle               | 11 ++++
 .../my-project/app/build.gradle.kts           | 11 ----
 .../my-project/business-logic/build.gradle    |  9 ++++
 .../my-project/data-model/build.gradle        |  3 ++
 .../my-project/settings.gradle                |  6 +++
 .../{build.gradle.kts => build.gradle}        |  0
 .../my-build-logic/settings.gradle            |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../MyProjectStructureSettingsPlugin.java     |  4 +-
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../my-project/business-logic/build.gradle    |  0
 .../business-logic/build.gradle.kts           |  9 ----
 .../my-project/data-model/build.gradle        |  0
 .../my-project/data-model/build.gradle.kts    |  3 --
 .../my-project/settings.gradle                |  0
 .../my-project/settings.gradle.kts            |  6 ---
 .../{build.gradle.kts => build.gradle}        | 24 ++++-----
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    | 20 ++++----
 .../module/{build.gradle.kts => build.gradle} | 20 ++++----
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../main/groovy/my-java-application.gradle    |  0
 .../src/main/groovy/my-java-base.gradle       | 51 +++++++++++++++++++
 .../src/main/groovy/my-java-library.gradle    |  0
 .../my-root.gradle}                           |  0
 .../kotlin/my-java-application.gradle.kts     |  4 --
 .../src/main/kotlin/my-java-base.gradle.kts   | 50 ------------------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../module/{build.gradle.kts => build.gradle} |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../src/main/groovy/my-java-library.gradle    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../module/{build.gradle.kts => build.gradle} |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  2 +-
 .../my-java-base.gradle}                      | 12 ++---
 .../src/main/groovy/my-java-library.gradle    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../module/{build.gradle.kts => build.gradle} |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../src/main/groovy/my-java-library.gradle    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{build.gradle.kts => build.gradle}        |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  8 +--
 .../src/main/groovy/my-java-library.gradle    |  0
 .../org/example/JavaModuleTransform.groovy}   | 30 ++++++-----
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../{build.gradle.kts => build.gradle}        |  2 +-
 .../my-java-application.gradle}               |  0
 .../my-java-base.gradle}                      |  2 +-
 .../src/main/groovy/my-java-library.gradle    |  0
 .../main/kotlin/my-java-library.gradle.kts    |  4 --
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               | 12 ++---
 .../org/example/ApplicationReportTask.groovy  | 36 +++++++++++++
 .../org/example/MyEnum.groovy}                |  2 +-
 .../org/example/ApplicationReportTask.kt      | 36 -------------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../my-java-application.gradle}               | 16 +++---
 .../org/example/GenerateStartScript.groovy    | 43 ++++++++++++++++
 .../kotlin/org/example/GenerateStartScript.kt | 44 ----------------
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../my-build-logic/java-plugins/build.gradle  |  3 ++
 .../java-plugins/build.gradle.kts             |  3 --
 .../PrintVersion.groovy}                      |  8 +--
 .../my-java-application.gradle}               |  5 +-
 .../{settings.gradle.kts => settings.gradle}  |  0
 .../app/{build.gradle.kts => build.gradle}    |  0
 .../{settings.gradle.kts => settings.gradle}  |  0
 417 files changed, 803 insertions(+), 805 deletions(-)
 rename 01_The_Settings_File/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 02_The_Build_Files/my-project/app/{build.gradle.kts => build.gradle} (63%)
 rename 02_The_Build_Files/my-project/business-logic/{build.gradle.kts => build.gradle} (72%)
 create mode 100644 02_The_Build_Files/my-project/data-model/build.gradle
 delete mode 100644 02_The_Build_Files/my-project/data-model/build.gradle.kts
 rename 02_The_Build_Files/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 03_Plugins/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (76%)
 create mode 100644 03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
 rename 03_Plugins/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (61%)
 delete mode 100644 03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
 rename 03_Plugins/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 03_Plugins/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 03_Plugins/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 03_Plugins/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 03_Plugins/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 04_Tasks/my-build-logic/java-plugins/build.gradle
 delete mode 100644 04_Tasks/my-build-logic/java-plugins/build.gradle.kts
 create mode 100644 04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
 create mode 100644 04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
 delete mode 100644 04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
 delete mode 100644 04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
 rename 04_Tasks/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 04_Tasks/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 04_Tasks/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 04_Tasks/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 04_Tasks/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 05_Lifecycle_Tasks/my-build-logic/build.gradle
 delete mode 100644 05_Lifecycle_Tasks/my-build-logic/build.gradle.kts
 create mode 100644 05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle
 delete mode 100644 05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle.kts
 rename 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (73%)
 rename 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (86%)
 rename 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 05_Lifecycle_Tasks/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 05_Lifecycle_Tasks/my-other-project/build.gradle
 delete mode 100644 05_Lifecycle_Tasks/my-other-project/build.gradle.kts
 rename 05_Lifecycle_Tasks/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 05_Lifecycle_Tasks/my-project/app/{build.gradle.kts => build.gradle} (100%)
 create mode 100644 05_Lifecycle_Tasks/my-project/build.gradle
 delete mode 100644 05_Lifecycle_Tasks/my-project/build.gradle.kts
 rename 05_Lifecycle_Tasks/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 05_Lifecycle_Tasks/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 05_Lifecycle_Tasks/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle
 delete mode 100644 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle.kts
 rename 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (75%)
 create mode 100644 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
 rename 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 delete mode 100644 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
 rename 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 06_Configuring_Task_Inputs_And_Outputs/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 06_Configuring_Task_Inputs_And_Outputs/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 06_Configuring_Task_Inputs_And_Outputs/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 06_Configuring_Task_Inputs_And_Outputs/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle
 delete mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle.kts
 rename 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (70%)
 create mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
 rename 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 create mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/GenerateStartScript.groovy
 rename 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/{kotlin/myproject/tasks/MyAppExtension.kt => groovy/myproject/tasks/MyAppExtension.groovy} (72%)
 delete mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
 delete mode 100644 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/GenerateStartScript.kt
 rename 07_Implementing_Tasks_and_Extensions/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 07_Implementing_Tasks_and_Extensions/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 07_Implementing_Tasks_and_Extensions/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 07_Implementing_Tasks_and_Extensions/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 07_Implementing_Tasks_and_Extensions/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle
 delete mode 100644 08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle.kts
 rename 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (84%)
 rename 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 08_Declaring_Dependencis/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 08_Declaring_Dependencis/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 08_Declaring_Dependencis/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 08_Declaring_Dependencis/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 08_Declaring_Dependencis/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 08_Declaring_Dependencis/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 08_Declaring_Dependencis/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle
 delete mode 100644 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle.kts
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (80%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (83%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (71%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/shared-platform/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle
 delete mode 100644 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle.kts
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (52%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle
 delete mode 100644 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle.kts
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (62%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/{kotlin/my-root-project.gradle.kts => groovy/my-root-project.gradle} (88%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle
 delete mode 100644 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle.kts
 rename 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (51%)
 rename 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 10_Dependency_Version_Conflicts/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle
 delete mode 100644 11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle.kts
 create mode 100644 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/metadata-rules.gradle
 rename 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (90%)
 rename 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/{kotlin/myproject/metadatarules/Slf4JImplRule.kt => groovy/myproject/metadatarules/Slf4JImplRule.groovy} (67%)
 delete mode 100644 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/metadata-rules.gradle.kts
 rename 11_Capability_Conflicts/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 11_Capability_Conflicts/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 11_Capability_Conflicts/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 11_Capability_Conflicts/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 11_Capability_Conflicts/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 11_Capability_Conflicts/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle
 delete mode 100644 12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle.kts
 rename 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (84%)
 rename 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (51%)
 rename 12_Publishing_Libraries/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 12_Publishing_Libraries/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 12_Publishing_Libraries/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 12_Publishing_Libraries/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 12_Publishing_Libraries/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 12_Publishing_Libraries/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 12_Publishing_Libraries/my-project/{settings.gradle.kts => settings.gradle} (81%)
 create mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle
 delete mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle.kts
 create mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
 create mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
 rename 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 delete mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
 delete mode 100644 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
 rename 13_Aggregating_Custom_Artifacts/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 13_Aggregating_Custom_Artifacts/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 13_Aggregating_Custom_Artifacts/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 13_Aggregating_Custom_Artifacts/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 13_Aggregating_Custom_Artifacts/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 13_Aggregating_Custom_Artifacts/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 14_Settings_Plugins/my-build-logic/java-plugins/build.gradle
 delete mode 100644 14_Settings_Plugins/my-build-logic/java-plugins/build.gradle.kts
 rename 14_Settings_Plugins/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 14_Settings_Plugins/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (73%)
 rename 14_Settings_Plugins/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 14_Settings_Plugins/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle.kts
 rename 18_Configuring_Testing/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts => 14_Settings_Plugins/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle (56%)
 rename 14_Settings_Plugins/my-other-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 14_Settings_Plugins/my-other-project/shared-utils/{build.gradle.kts => build.gradle} (100%)
 rename 14_Settings_Plugins/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 14_Settings_Plugins/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 14_Settings_Plugins/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 14_Settings_Plugins/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 16_Source_Sets/my-android-project/app-android/{build.gradle.kts => build.gradle} (100%)
 rename 16_Source_Sets/my-android-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 16_Source_Sets/my-build-logic/android-plugins/{build.gradle.kts => build.gradle} (75%)
 rename 16_Source_Sets/my-build-logic/android-plugins/src/main/{kotlin/my-android-application.gradle.kts => groovy/my-android-application.gradle} (88%)
 create mode 100644 16_Source_Sets/my-build-logic/java-plugins/build.gradle
 delete mode 100644 16_Source_Sets/my-build-logic/java-plugins/build.gradle.kts
 rename 16_Source_Sets/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (67%)
 rename 16_Source_Sets/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (51%)
 rename 16_Source_Sets/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 16_Source_Sets/my-build-logic/kotlin-plugins/{build.gradle.kts => build.gradle} (77%)
 rename 16_Source_Sets/my-build-logic/kotlin-plugins/src/main/{kotlin/my-kotlin-multiplatform-lib.gradle.kts => groovy/my-kotlin-multiplatform-lib.gradle} (100%)
 rename 16_Source_Sets/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 16_Source_Sets/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 16_Source_Sets/my-build-logic/structure-plugins/build.gradle.kts
 rename 16_Source_Sets/my-build-logic/structure-plugins/src/main/{kotlin/my-project-structure.settings.gradle.kts => groovy/my-project-structure.settings.gradle} (64%)
 rename 16_Source_Sets/my-kotlin-multi-platform-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 16_Source_Sets/my-kotlin-multi-platform-project/utils-kotlin/{build.gradle.kts => build.gradle} (100%)
 rename 16_Source_Sets/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 16_Source_Sets/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 16_Source_Sets/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 16_Source_Sets/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 17_Feature_Variants/my-build-logic/java-plugins/build.gradle
 delete mode 100644 17_Feature_Variants/my-build-logic/java-plugins/build.gradle.kts
 rename 17_Feature_Variants/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 17_Feature_Variants/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (66%)
 rename 17_Feature_Variants/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (69%)
 rename 17_Feature_Variants/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 17_Feature_Variants/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 17_Feature_Variants/my-build-logic/structure-plugins/build.gradle.kts
 rename 19_The_Test_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts => 17_Feature_Variants/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle (56%)
 rename 17_Feature_Variants/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 17_Feature_Variants/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 17_Feature_Variants/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 17_Feature_Variants/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 18_Configuring_Testing/my-build-logic/java-plugins/build.gradle
 delete mode 100644 18_Configuring_Testing/my-build-logic/java-plugins/build.gradle.kts
 rename 18_Configuring_Testing/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 18_Configuring_Testing/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (83%)
 rename 18_Configuring_Testing/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 18_Configuring_Testing/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle.kts
 rename 17_Feature_Variants/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts => 18_Configuring_Testing/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle (56%)
 rename 18_Configuring_Testing/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 18_Configuring_Testing/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 18_Configuring_Testing/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 18_Configuring_Testing/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 19_The_Test_Task/my-build-logic/java-plugins/build.gradle
 delete mode 100644 19_The_Test_Task/my-build-logic/java-plugins/build.gradle.kts
 rename 19_The_Test_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 19_The_Test_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (83%)
 rename 19_The_Test_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 19_The_Test_Task/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 19_The_Test_Task/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 19_The_Test_Task/my-build-logic/structure-plugins/build.gradle.kts
 rename 14_Settings_Plugins/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts => 19_The_Test_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle (56%)
 rename 19_The_Test_Task/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 19_The_Test_Task/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 19_The_Test_Task/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 19_The_Test_Task/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 20_Test_Fixtures/my-build-logic/java-plugins/build.gradle
 delete mode 100644 20_Test_Fixtures/my-build-logic/java-plugins/build.gradle.kts
 rename 20_Test_Fixtures/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 20_Test_Fixtures/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (89%)
 rename 20_Test_Fixtures/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (81%)
 rename 20_Test_Fixtures/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle.kts
 create mode 100644 20_Test_Fixtures/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
 delete mode 100644 20_Test_Fixtures/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
 rename 20_Test_Fixtures/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 20_Test_Fixtures/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 20_Test_Fixtures/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 20_Test_Fixtures/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle
 delete mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle.kts
 rename 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (63%)
 rename 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (71%)
 rename 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 21_Test_and_Code_Coverage_Reporting/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle.kts
 create mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
 delete mode 100644 21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
 rename 21_Test_and_Code_Coverage_Reporting/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 21_Test_and_Code_Coverage_Reporting/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 21_Test_and_Code_Coverage_Reporting/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 21_Test_and_Code_Coverage_Reporting/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle
 delete mode 100644 22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle.kts
 rename 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (87%)
 rename 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 22_The_JavaCompile_Task/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle.kts
 create mode 100644 22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
 delete mode 100644 22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
 rename 22_The_JavaCompile_Task/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 22_The_JavaCompile_Task/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 22_The_JavaCompile_Task/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 22_The_JavaCompile_Task/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 23_Caching/my-build-logic/java-plugins/build.gradle
 delete mode 100644 23_Caching/my-build-logic/java-plugins/build.gradle.kts
 rename 23_Caching/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 23_Caching/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (75%)
 rename 23_Caching/my-build-logic/java-plugins/src/main/{kotlin/my-java-library.gradle.kts => groovy/my-java-library.gradle} (100%)
 rename 23_Caching/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 23_Caching/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 23_Caching/my-project/business-logic/{build.gradle.kts => build.gradle} (100%)
 rename 23_Caching/my-project/data-model/{build.gradle.kts => build.gradle} (100%)
 rename 23_Caching/my-project/{settings.gradle.kts => settings.gradle} (55%)
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle
 delete mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle.kts
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
 delete mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
 rename 25_Using_Java_to_configure_builds/my-build-logic/settings.gradle.kts => 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle (58%)
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle
 delete mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle.kts
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
 delete mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle
 delete mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle.kts
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle
 create mode 100644 24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle
 rename 25_Using_Java_to_configure_builds/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (100%)
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle.kts => 25_Using_Java_to_configure_builds/my-build-logic/settings.gradle (100%)
 rename 25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/{build.gradle.kts => build.gradle} (100%)
 rename 25_Using_Java_to_configure_builds/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle.kts => 25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle (100%)
 delete mode 100644 25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle.kts
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle.kts => 25_Using_Java_to_configure_builds/my-project/data-model/build.gradle (100%)
 delete mode 100644 25_Using_Java_to_configure_builds/my-project/data-model/build.gradle.kts
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle.kts => 25_Using_Java_to_configure_builds/my-project/settings.gradle (100%)
 delete mode 100644 25_Using_Java_to_configure_builds/my-project/settings.gradle.kts
 rename 26_The_Classpath/my-project/{build.gradle.kts => build.gradle} (55%)
 rename 26_The_Classpath/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 27_Multiple_Compile_Classpaths/my-project/app/{build.gradle.kts => build.gradle} (54%)
 rename 27_Multiple_Compile_Classpaths/my-project/module/{build.gradle.kts => build.gradle} (54%)
 rename 27_Multiple_Compile_Classpaths/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (78%)
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts => 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle (100%)
 create mode 100644 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
 rename 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 rename 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/{kotlin/my-root.gradle.kts => groovy/my-root.gradle} (100%)
 delete mode 100644 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
 delete mode 100644 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
 rename 28_Dependency_Analysis_Plugin/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 28_Dependency_Analysis_Plugin/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 28_Dependency_Analysis_Plugin/my-project/{build.gradle.kts => build.gradle} (100%)
 rename 28_Dependency_Analysis_Plugin/my-project/module/{build.gradle.kts => build.gradle} (100%)
 rename 28_Dependency_Analysis_Plugin/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 29_Classpath_Collisions/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (86%)
 rename 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (65%)
 rename 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 rename 29_Classpath_Collisions/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 29_Classpath_Collisions/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 29_Classpath_Collisions/my-project/module/{build.gradle.kts => build.gradle} (100%)
 rename 29_Classpath_Collisions/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 30_Security_Vulnerabilities/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (74%)
 rename 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (66%)
 rename 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (53%)
 rename 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 rename 30_Security_Vulnerabilities/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 30_Security_Vulnerabilities/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 30_Security_Vulnerabilities/my-project/module/{build.gradle.kts => build.gradle} (100%)
 rename 30_Security_Vulnerabilities/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 31_The_Module_Path/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (75%)
 rename 31_The_Module_Path/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 31_The_Module_Path/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (92%)
 rename 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 rename 31_The_Module_Path/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 31_The_Module_Path/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 31_The_Module_Path/my-project/modulea/{build.gradle.kts => build.gradle} (100%)
 rename 31_The_Module_Path/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 32_Artifact_Transforms/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (74%)
 rename 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (79%)
 rename 31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 rename 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/{kotlin/org/example/JavaModuleTransform.kt => groovy/org/example/JavaModuleTransform.groovy} (53%)
 rename 32_Artifact_Transforms/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 32_Artifact_Transforms/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 32_Artifact_Transforms/my-project/{settings.gradle.kts => settings.gradle} (100%)
 rename 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/{build.gradle.kts => build.gradle} (89%)
 rename 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (100%)
 rename 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/{kotlin/my-java-base.gradle.kts => groovy/my-java-base.gradle} (94%)
 rename 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts => 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle (100%)
 delete mode 100644 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
 rename 33_Classpath_and_Module_Path_in_Testing/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 33_Classpath_and_Module_Path_in_Testing/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 33_Classpath_and_Module_Path_in_Testing/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle
 delete mode 100644 34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle.kts
 rename 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (56%)
 create mode 100644 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/ApplicationReportTask.groovy
 rename 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/{kotlin/org/example/MyEnum.kt => groovy/org/example/MyEnum.groovy} (52%)
 delete mode 100644 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/ApplicationReportTask.kt
 rename 34_Properties_and_Providers/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 34_Properties_and_Providers/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 34_Properties_and_Providers/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 35_Working_with_Files/my-build-logic/java-plugins/build.gradle
 delete mode 100644 35_Working_with_Files/my-build-logic/java-plugins/build.gradle.kts
 rename 35_Working_with_Files/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (68%)
 create mode 100644 35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/org/example/GenerateStartScript.groovy
 delete mode 100644 35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/org/example/GenerateStartScript.kt
 rename 35_Working_with_Files/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 35_Working_with_Files/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 35_Working_with_Files/my-project/{settings.gradle.kts => settings.gradle} (100%)
 create mode 100644 36_Task_Actions/my-build-logic/java-plugins/build.gradle
 delete mode 100644 36_Task_Actions/my-build-logic/java-plugins/build.gradle.kts
 rename 36_Task_Actions/my-build-logic/java-plugins/src/main/{kotlin/PrintVersion.kt => groovy/PrintVersion.groovy} (64%)
 rename 36_Task_Actions/my-build-logic/java-plugins/src/main/{kotlin/my-java-application.gradle.kts => groovy/my-java-application.gradle} (88%)
 rename 36_Task_Actions/my-build-logic/{settings.gradle.kts => settings.gradle} (100%)
 rename 36_Task_Actions/my-project/app/{build.gradle.kts => build.gradle} (100%)
 rename 36_Task_Actions/my-project/{settings.gradle.kts => settings.gradle} (100%)

diff --git a/01_The_Settings_File/my-project/settings.gradle.kts b/01_The_Settings_File/my-project/settings.gradle
similarity index 100%
rename from 01_The_Settings_File/my-project/settings.gradle.kts
rename to 01_The_Settings_File/my-project/settings.gradle
diff --git a/02_The_Build_Files/my-project/app/build.gradle.kts b/02_The_Build_Files/my-project/app/build.gradle
similarity index 63%
rename from 02_The_Build_Files/my-project/app/build.gradle.kts
rename to 02_The_Build_Files/my-project/app/build.gradle
index 2c0767d..577dde1 100644
--- a/02_The_Build_Files/my-project/app/build.gradle.kts
+++ b/02_The_Build_Files/my-project/app/build.gradle
@@ -3,7 +3,7 @@ plugins {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies {
diff --git a/02_The_Build_Files/my-project/business-logic/build.gradle.kts b/02_The_Build_Files/my-project/business-logic/build.gradle
similarity index 72%
rename from 02_The_Build_Files/my-project/business-logic/build.gradle.kts
rename to 02_The_Build_Files/my-project/business-logic/build.gradle
index 46a842b..a023994 100644
--- a/02_The_Build_Files/my-project/business-logic/build.gradle.kts
+++ b/02_The_Build_Files/my-project/business-logic/build.gradle
@@ -3,7 +3,7 @@ plugins {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies {
diff --git a/02_The_Build_Files/my-project/data-model/build.gradle b/02_The_Build_Files/my-project/data-model/build.gradle
new file mode 100644
index 0000000..e322f17
--- /dev/null
+++ b/02_The_Build_Files/my-project/data-model/build.gradle
@@ -0,0 +1,7 @@
+plugins {
+    id("java-library")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
diff --git a/02_The_Build_Files/my-project/data-model/build.gradle.kts b/02_The_Build_Files/my-project/data-model/build.gradle.kts
deleted file mode 100644
index e9c66b8..0000000
--- a/02_The_Build_Files/my-project/data-model/build.gradle.kts
+++ /dev/null
@@ -1,7 +0,0 @@
-plugins {
-    id("java-library")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
diff --git a/02_The_Build_Files/my-project/settings.gradle.kts b/02_The_Build_Files/my-project/settings.gradle
similarity index 100%
rename from 02_The_Build_Files/my-project/settings.gradle.kts
rename to 02_The_Build_Files/my-project/settings.gradle
diff --git a/03_Plugins/my-build-logic/java-plugins/build.gradle.kts b/03_Plugins/my-build-logic/java-plugins/build.gradle
similarity index 76%
rename from 03_Plugins/my-build-logic/java-plugins/build.gradle.kts
rename to 03_Plugins/my-build-logic/java-plugins/build.gradle
index 3cd65cd..a32a279 100644
--- a/03_Plugins/my-build-logic/java-plugins/build.gradle.kts
+++ b/03_Plugins/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle b/03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
new file mode 100644
index 0000000..6b681ff
--- /dev/null
+++ b/03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -0,0 +1,11 @@
+plugins {
+    id("application")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
+
+tasks.named("test") {
+    useJUnitPlatform()
+}
diff --git a/03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 61%
rename from 03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
index 836f00b..babee71 100644
--- a/03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ b/03_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -4,10 +4,10 @@ plugins {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform()
 }
 
diff --git a/03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
deleted file mode 100644
index bff7b22..0000000
--- a/03_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ /dev/null
@@ -1,11 +0,0 @@
-plugins {
-    id("application")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
-
-tasks.test {
-    useJUnitPlatform()
-}
diff --git a/03_Plugins/my-build-logic/settings.gradle.kts b/03_Plugins/my-build-logic/settings.gradle
similarity index 100%
rename from 03_Plugins/my-build-logic/settings.gradle.kts
rename to 03_Plugins/my-build-logic/settings.gradle
diff --git a/03_Plugins/my-project/app/build.gradle.kts b/03_Plugins/my-project/app/build.gradle
similarity index 100%
rename from 03_Plugins/my-project/app/build.gradle.kts
rename to 03_Plugins/my-project/app/build.gradle
diff --git a/03_Plugins/my-project/business-logic/build.gradle.kts b/03_Plugins/my-project/business-logic/build.gradle
similarity index 100%
rename from 03_Plugins/my-project/business-logic/build.gradle.kts
rename to 03_Plugins/my-project/business-logic/build.gradle
diff --git a/03_Plugins/my-project/data-model/build.gradle.kts b/03_Plugins/my-project/data-model/build.gradle
similarity index 100%
rename from 03_Plugins/my-project/data-model/build.gradle.kts
rename to 03_Plugins/my-project/data-model/build.gradle
diff --git a/03_Plugins/my-project/settings.gradle.kts b/03_Plugins/my-project/settings.gradle
similarity index 100%
rename from 03_Plugins/my-project/settings.gradle.kts
rename to 03_Plugins/my-project/settings.gradle
diff --git a/04_Tasks/my-build-logic/java-plugins/build.gradle b/04_Tasks/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/04_Tasks/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/04_Tasks/my-build-logic/java-plugins/build.gradle.kts b/04_Tasks/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/04_Tasks/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle b/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
new file mode 100644
index 0000000..c4b0a1b
--- /dev/null
+++ b/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -0,0 +1,7 @@
+plugins {
+    id("application")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
diff --git a/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle b/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
new file mode 100644
index 0000000..e322f17
--- /dev/null
+++ b/04_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -0,0 +1,7 @@
+plugins {
+    id("java-library")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
diff --git a/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
deleted file mode 100644
index ac430ba..0000000
--- a/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ /dev/null
@@ -1,7 +0,0 @@
-plugins {
-    id("application")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
diff --git a/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
deleted file mode 100644
index e9c66b8..0000000
--- a/04_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ /dev/null
@@ -1,7 +0,0 @@
-plugins {
-    id("java-library")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
diff --git a/04_Tasks/my-build-logic/settings.gradle.kts b/04_Tasks/my-build-logic/settings.gradle
similarity index 100%
rename from 04_Tasks/my-build-logic/settings.gradle.kts
rename to 04_Tasks/my-build-logic/settings.gradle
diff --git a/04_Tasks/my-project/app/build.gradle.kts b/04_Tasks/my-project/app/build.gradle
similarity index 100%
rename from 04_Tasks/my-project/app/build.gradle.kts
rename to 04_Tasks/my-project/app/build.gradle
diff --git a/04_Tasks/my-project/business-logic/build.gradle.kts b/04_Tasks/my-project/business-logic/build.gradle
similarity index 100%
rename from 04_Tasks/my-project/business-logic/build.gradle.kts
rename to 04_Tasks/my-project/business-logic/build.gradle
diff --git a/04_Tasks/my-project/data-model/build.gradle.kts b/04_Tasks/my-project/data-model/build.gradle
similarity index 100%
rename from 04_Tasks/my-project/data-model/build.gradle.kts
rename to 04_Tasks/my-project/data-model/build.gradle
diff --git a/04_Tasks/my-project/settings.gradle.kts b/04_Tasks/my-project/settings.gradle
similarity index 100%
rename from 04_Tasks/my-project/settings.gradle.kts
rename to 04_Tasks/my-project/settings.gradle
diff --git a/05_Lifecycle_Tasks/my-build-logic/build.gradle b/05_Lifecycle_Tasks/my-build-logic/build.gradle
new file mode 100644
index 0000000..7793210
--- /dev/null
+++ b/05_Lifecycle_Tasks/my-build-logic/build.gradle
@@ -0,0 +1,3 @@
+tasks.register("checkAll") {
+    dependsOn(subprojects.collect { ":${it.name}:check" })
+}
diff --git a/05_Lifecycle_Tasks/my-build-logic/build.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/build.gradle.kts
deleted file mode 100644
index 28b6c03..0000000
--- a/05_Lifecycle_Tasks/my-build-logic/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-tasks.register("checkAll") {
-    dependsOn(subprojects.map { ":${it.name}:check" })
-}
diff --git a/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle b/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/05_Lifecycle_Tasks/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 73%
rename from 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index 59d0f64..f2f7c51 100644
--- a/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -3,7 +3,7 @@ plugins {
     id("application")
 }
 
-val myBuildGroup = "my project build"
+def myBuildGroup = "my project build"
 
 tasks.named("run") {
     group = myBuildGroup
diff --git a/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 86%
rename from 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 227a138..e658d07 100644
--- a/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -3,21 +3,21 @@ plugins {
     id("checkstyle")
 }
 
-val myBuildGroup = "my project build"
-tasks.named<TaskReportTask>("tasks") {
+def myBuildGroup = "my project build"
+tasks.named("tasks") {
     displayGroup = myBuildGroup
 }
 
-tasks.register<TaskReportTask>("tasksAll") {
+tasks.register("tasksAll", TaskReportTask) {
     group = myBuildGroup
     description = "Show additional tasks."
     setShowDetail(true)
 }
 
-tasks.build {
+tasks.named("build") {
     group = myBuildGroup
 }
-tasks.check {
+tasks.named("check") {
     group = myBuildGroup
     description = "Runs checks (including tests)."
 }
@@ -49,10 +49,10 @@ tasks.register("lifecycleTasks") {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform()
     testLogging.showStandardStreams = true
 }
diff --git a/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 05_Lifecycle_Tasks/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/05_Lifecycle_Tasks/my-build-logic/settings.gradle.kts b/05_Lifecycle_Tasks/my-build-logic/settings.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-build-logic/settings.gradle.kts
rename to 05_Lifecycle_Tasks/my-build-logic/settings.gradle
diff --git a/05_Lifecycle_Tasks/my-other-project/build.gradle b/05_Lifecycle_Tasks/my-other-project/build.gradle
new file mode 100644
index 0000000..7793210
--- /dev/null
+++ b/05_Lifecycle_Tasks/my-other-project/build.gradle
@@ -0,0 +1,3 @@
+tasks.register("checkAll") {
+    dependsOn(subprojects.collect { ":${it.name}:check" })
+}
diff --git a/05_Lifecycle_Tasks/my-other-project/build.gradle.kts b/05_Lifecycle_Tasks/my-other-project/build.gradle.kts
deleted file mode 100644
index 28b6c03..0000000
--- a/05_Lifecycle_Tasks/my-other-project/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-tasks.register("checkAll") {
-    dependsOn(subprojects.map { ":${it.name}:check" })
-}
diff --git a/05_Lifecycle_Tasks/my-other-project/settings.gradle.kts b/05_Lifecycle_Tasks/my-other-project/settings.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-other-project/settings.gradle.kts
rename to 05_Lifecycle_Tasks/my-other-project/settings.gradle
diff --git a/05_Lifecycle_Tasks/my-project/app/build.gradle.kts b/05_Lifecycle_Tasks/my-project/app/build.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-project/app/build.gradle.kts
rename to 05_Lifecycle_Tasks/my-project/app/build.gradle
diff --git a/05_Lifecycle_Tasks/my-project/build.gradle b/05_Lifecycle_Tasks/my-project/build.gradle
new file mode 100644
index 0000000..a12deee
--- /dev/null
+++ b/05_Lifecycle_Tasks/my-project/build.gradle
@@ -0,0 +1,17 @@
+def globalBuildGroup = "My global build"
+def ciBuildGroup = "My CI build"
+
+tasks.named("tasks") {
+    displayGroup = globalBuildGroup
+}
+
+tasks.register("qualityCheckAll") {
+    group = globalBuildGroup
+    dependsOn(subprojects.collect { ":${it.name}:qualityCheck" })
+}
+
+tasks.register("checkAll") {
+    group = ciBuildGroup
+    dependsOn(subprojects.collect { ":${it.name}:check" })
+    dependsOn(gradle.includedBuilds.collect { it.task(":checkAll") })
+}
diff --git a/05_Lifecycle_Tasks/my-project/build.gradle.kts b/05_Lifecycle_Tasks/my-project/build.gradle.kts
deleted file mode 100644
index 2f30fc8..0000000
--- a/05_Lifecycle_Tasks/my-project/build.gradle.kts
+++ /dev/null
@@ -1,17 +0,0 @@
-val globalBuildGroup = "My global build"
-val ciBuildGroup = "My CI build"
-
-tasks.named<TaskReportTask>("tasks") {
-    displayGroup = globalBuildGroup
-}
-
-tasks.register("qualityCheckAll") {
-    group = globalBuildGroup
-    dependsOn(subprojects.map { ":${it.name}:qualityCheck" })
-}
-
-tasks.register("checkAll") {
-    group = ciBuildGroup
-    dependsOn(subprojects.map { ":${it.name}:check" })
-    dependsOn(gradle.includedBuilds.map { it.task(":checkAll") })
-}
diff --git a/05_Lifecycle_Tasks/my-project/business-logic/build.gradle.kts b/05_Lifecycle_Tasks/my-project/business-logic/build.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-project/business-logic/build.gradle.kts
rename to 05_Lifecycle_Tasks/my-project/business-logic/build.gradle
diff --git a/05_Lifecycle_Tasks/my-project/data-model/build.gradle.kts b/05_Lifecycle_Tasks/my-project/data-model/build.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-project/data-model/build.gradle.kts
rename to 05_Lifecycle_Tasks/my-project/data-model/build.gradle
diff --git a/05_Lifecycle_Tasks/my-project/settings.gradle.kts b/05_Lifecycle_Tasks/my-project/settings.gradle
similarity index 100%
rename from 05_Lifecycle_Tasks/my-project/settings.gradle.kts
rename to 05_Lifecycle_Tasks/my-project/settings.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 75%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index 9e9a219..88a5dfb 100644
--- a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -2,9 +2,9 @@ plugins {
     id("my-java-base")
 }
 
-val packageApp = tasks.register<Zip>("packageApp") {
+def packageApp = tasks.register("packageApp", Zip) {
     from(layout.projectDirectory.file("run.sh"))
-    from(tasks.jar) {
+    from(tasks.named("jar")) {
         into("libs")
     }
     from(configurations.runtimeClasspath) {
@@ -15,7 +15,7 @@ val packageApp = tasks.register<Zip>("packageApp") {
     archiveFileName.set("myApplication.zip")
 }
 
-tasks.build {
+tasks.named("build") {
     dependsOn(packageApp)
 }
 
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
new file mode 100644
index 0000000..6eea88c
--- /dev/null
+++ b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -0,0 +1,7 @@
+plugins {
+    id("java")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
deleted file mode 100644
index 14a33d9..0000000
--- a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ /dev/null
@@ -1,7 +0,0 @@
-plugins {
-    id("java")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/settings.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-build-logic/settings.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/settings.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-build-logic/settings.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-project/app/build.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-project/app/build.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-project/app/build.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-project/app/build.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-project/business-logic/build.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-project/business-logic/build.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-project/business-logic/build.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-project/business-logic/build.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-project/data-model/build.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-project/data-model/build.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-project/data-model/build.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-project/data-model/build.gradle
diff --git a/06_Configuring_Task_Inputs_And_Outputs/my-project/settings.gradle.kts b/06_Configuring_Task_Inputs_And_Outputs/my-project/settings.gradle
similarity index 100%
rename from 06_Configuring_Task_Inputs_And_Outputs/my-project/settings.gradle.kts
rename to 06_Configuring_Task_Inputs_And_Outputs/my-project/settings.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 70%
rename from 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index d2e5670..f4bb7b3 100644
--- a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -5,14 +5,14 @@ plugins {
     id("my-java-base")
 }
 
-val myApp = extensions.create<MyAppExtension>("myApp")
+def myApp = extensions.create("myApp", MyAppExtension)
 
-val generateStartScript = tasks.register<GenerateStartScript>("generateStartScript") {
+def generateStartScript = tasks.register("generateStartScript", GenerateStartScript) {
     mainClass.convention(myApp.mainClass)
     scriptFile.set(layout.buildDirectory.file("run.sh"))
 }
 
-val packageApp = tasks.register<Zip>("packageApp") {
+def packageApp = tasks.register("packageApp", Zip) {
     from(generateStartScript)
     from(tasks.jar) {
         into("libs")
@@ -25,7 +25,7 @@ val packageApp = tasks.register<Zip>("packageApp") {
     archiveFileName.set("myApplication.zip")
 }
 
-tasks.build {
+tasks.named("build") {
     dependsOn(packageApp)
 }
 
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
new file mode 100644
index 0000000..6eea88c
--- /dev/null
+++ b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -0,0 +1,7 @@
+plugins {
+    id("java")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/GenerateStartScript.groovy b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/GenerateStartScript.groovy
new file mode 100644
index 0000000..0555e64
--- /dev/null
+++ b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/GenerateStartScript.groovy
@@ -0,0 +1,36 @@
+package myproject.tasks
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.CacheableTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+import java.nio.file.Files
+import static java.nio.file.attribute.PosixFilePermission.*
+
+@CacheableTask
+abstract class GenerateStartScript extends DefaultTask {
+
+    @Input
+    abstract Property<String> getMainClass()
+
+    @OutputFile
+    abstract RegularFileProperty getScriptFile()
+
+    @TaskAction
+    def generate() {
+        def main = mainClass.get() // String
+        def out = scriptFile.get().asFile // java.io.File
+        def script = "java -cp 'libs/*' $main"
+
+        out.text = script
+        Files.setPosixFilePermissions(out.toPath(), [
+            OWNER_READ, OWNER_WRITE, OWNER_EXECUTE,
+            GROUP_READ, GROUP_EXECUTE,
+            OTHERS_EXECUTE, OTHERS_READ
+        ] as Set)
+    }
+}
\ No newline at end of file
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/MyAppExtension.kt b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/MyAppExtension.groovy
similarity index 72%
rename from 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/MyAppExtension.kt
rename to 07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/MyAppExtension.groovy
index 3e46a42..cbd663e 100644
--- a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/MyAppExtension.kt
+++ b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/groovy/myproject/tasks/MyAppExtension.groovy
@@ -3,5 +3,5 @@ package myproject.tasks
 import org.gradle.api.provider.Property
 
 interface MyAppExtension {
-    val mainClass: Property<String>
+    Property<String> getMainClass()
 }
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
deleted file mode 100644
index 14a33d9..0000000
--- a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ /dev/null
@@ -1,7 +0,0 @@
-plugins {
-    id("java")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/GenerateStartScript.kt b/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/GenerateStartScript.kt
deleted file mode 100644
index fcf997f..0000000
--- a/07_Implementing_Tasks_and_Extensions/my-build-logic/java-plugins/src/main/kotlin/myproject/tasks/GenerateStartScript.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-package myproject.tasks
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.provider.Property
-import org.gradle.api.tasks.CacheableTask
-import org.gradle.api.tasks.Input
-import org.gradle.api.tasks.OutputFile
-import org.gradle.api.tasks.TaskAction
-import java.nio.file.Files
-import java.nio.file.attribute.PosixFilePermission.*
-
-@CacheableTask
-abstract class GenerateStartScript : DefaultTask() {
-
-    @get:Input
-    abstract val mainClass: Property<String>
-
-    @get:OutputFile
-    abstract val scriptFile: RegularFileProperty
-
-    @TaskAction
-    fun generate() {
-        val main = mainClass.get() // String
-        val out = scriptFile.get().asFile // java.io.File
-        val script = "java -cp 'libs/*' $main"
-
-        out.writeText(script)
-        Files.setPosixFilePermissions(out.toPath(), setOf(
-            OWNER_READ, OWNER_WRITE, OWNER_EXECUTE,
-            GROUP_READ, GROUP_EXECUTE,
-            OTHERS_EXECUTE, OTHERS_READ
-        ))
-    }
-}
\ No newline at end of file
diff --git a/07_Implementing_Tasks_and_Extensions/my-build-logic/settings.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-build-logic/settings.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-build-logic/settings.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-build-logic/settings.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-project/app/build.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-project/app/build.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-project/app/build.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-project/app/build.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-project/business-logic/build.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-project/business-logic/build.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-project/business-logic/build.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-project/business-logic/build.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-project/data-model/build.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-project/data-model/build.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-project/data-model/build.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-project/data-model/build.gradle
diff --git a/07_Implementing_Tasks_and_Extensions/my-project/settings.gradle.kts b/07_Implementing_Tasks_and_Extensions/my-project/settings.gradle
similarity index 100%
rename from 07_Implementing_Tasks_and_Extensions/my-project/settings.gradle.kts
rename to 07_Implementing_Tasks_and_Extensions/my-project/settings.gradle
diff --git a/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle b/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle.kts b/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/08_Declaring_Dependencis/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 84%
rename from 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index b13effa..19fea26 100644
--- a/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -12,6 +12,6 @@ dependencies.constraints {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
diff --git a/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 08_Declaring_Dependencis/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/08_Declaring_Dependencis/my-build-logic/settings.gradle.kts b/08_Declaring_Dependencis/my-build-logic/settings.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-build-logic/settings.gradle.kts
rename to 08_Declaring_Dependencis/my-build-logic/settings.gradle
diff --git a/08_Declaring_Dependencis/my-other-project/settings.gradle.kts b/08_Declaring_Dependencis/my-other-project/settings.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-other-project/settings.gradle.kts
rename to 08_Declaring_Dependencis/my-other-project/settings.gradle
diff --git a/08_Declaring_Dependencis/my-other-project/shared-utils/build.gradle.kts b/08_Declaring_Dependencis/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-other-project/shared-utils/build.gradle.kts
rename to 08_Declaring_Dependencis/my-other-project/shared-utils/build.gradle
diff --git a/08_Declaring_Dependencis/my-project/app/build.gradle.kts b/08_Declaring_Dependencis/my-project/app/build.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-project/app/build.gradle.kts
rename to 08_Declaring_Dependencis/my-project/app/build.gradle
diff --git a/08_Declaring_Dependencis/my-project/business-logic/build.gradle.kts b/08_Declaring_Dependencis/my-project/business-logic/build.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-project/business-logic/build.gradle.kts
rename to 08_Declaring_Dependencis/my-project/business-logic/build.gradle
diff --git a/08_Declaring_Dependencis/my-project/data-model/build.gradle.kts b/08_Declaring_Dependencis/my-project/data-model/build.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-project/data-model/build.gradle.kts
rename to 08_Declaring_Dependencis/my-project/data-model/build.gradle
diff --git a/08_Declaring_Dependencis/my-project/settings.gradle.kts b/08_Declaring_Dependencis/my-project/settings.gradle
similarity index 100%
rename from 08_Declaring_Dependencis/my-project/settings.gradle.kts
rename to 08_Declaring_Dependencis/my-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 80%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 6c014c1..725a9cc 100644
--- a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -5,7 +5,7 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies.constraints {
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/settings.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-build-logic/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/shared-utils/build.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/shared-utils/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-other-project/shared-utils/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/app/build.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/app/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/app/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/app/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/business-logic/build.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/business-logic/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/business-logic/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/business-logic/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/data-model/build.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/data-model/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/data-model/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/data-model/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/A_Dependency_Constrains_in_Convention_Plugin/my-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle
similarity index 83%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle
index 0ef01c2..6e6ad09 100644
--- a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 71%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index dbcc49d..97a3348 100644
--- a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -5,7 +5,7 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies {
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/settings.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-build-logic/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/shared-utils/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/shared-utils/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-other-project/shared-utils/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/settings.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/shared-platform/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/shared-platform/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/shared-platform/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-platform/shared-platform/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/app/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/app/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/app/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/app/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/business-logic/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/business-logic/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/business-logic/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/business-logic/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/data-model/build.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/data-model/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/data-model/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/data-model/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/B_Platform_Project/my-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 52%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index e082874..87b30f6 100644
--- a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -5,7 +5,7 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/settings.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-build-logic/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/shared-utils/build.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/shared-utils/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-other-project/shared-utils/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/app/build.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/app/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/app/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/app/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/business-logic/build.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/business-logic/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/business-logic/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/business-logic/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/data-model/build.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/data-model/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/data-model/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/data-model/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/C_Version_Catalog/my-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 62%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 11b3528..e060a67 100644
--- a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -5,36 +5,36 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 configurations {
     compileClasspath {
-        useLatestVersionsAndLock()
+        useLatestVersionsAndLock(it)
     }
     runtimeClasspath {
-        useLatestVersionsAndLock()
+        useLatestVersionsAndLock(it)
     }
     testCompileClasspath {
-        useLatestVersionsAndLock()
+        useLatestVersionsAndLock(it)
     }
     testRuntimeClasspath {
-        useLatestVersionsAndLock()
+        useLatestVersionsAndLock(it)
     }
 }
 
 
-fun Configuration.useLatestVersionsAndLock() {
-    resolutionStrategy {
+void useLatestVersionsAndLock(Configuration conf) {
+    conf.resolutionStrategy {
         eachDependency {
-            if (requested.version.isNullOrEmpty()) { useVersion("latest.release") }
+            if (requested.version.isEmpty()) { useVersion("latest.release") }
         }
         activateDependencyLocking()
     }
 }
 
 dependencies.components.all {
-    val lcVersion = id.version.lowercase()
+    def lcVersion = id.version.toLowerCase()
     if (lcVersion.contains("alpha")
         || lcVersion.contains("-b")
         || lcVersion.contains("beta")
@@ -47,6 +47,3 @@ dependencies.components.all {
         status = "integration"
     }
 }
-
-
-
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-root-project.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-root-project.gradle
similarity index 88%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-root-project.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-root-project.gradle
index f74781d..9677eac 100644
--- a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/kotlin/my-root-project.gradle.kts
+++ b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/java-plugins/src/main/groovy/my-root-project.gradle
@@ -2,7 +2,7 @@ tasks.register("allDependencies") {
     group = "My project build"
     description = "Run ':allDependencies --write-locks' to update all the dependency lock files"
     // Resolve dependencies of all subprojects of 'this build'
-    dependsOn(subprojects.map { ":${it.name}:dependencies" })
+    dependsOn(subprojects.collect { ":${it.name}:dependencies" })
     // Resolve dependencies of all subprojects of included builds that are not 'this build' or the 'build-logic build'
     dependsOn(gradle.includedBuilds.filter {
         it.name !in listOf(project.name, "my-build-logic")
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/settings.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-build-logic/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/settings.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/shared-utils/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/shared-utils/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-other-project/shared-utils/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/app/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/app/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/app/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/app/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/business-logic/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/business-logic/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/business-logic/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/business-logic/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/data-model/build.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/data-model/build.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/data-model/build.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/data-model/build.gradle
diff --git a/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/settings.gradle.kts b/09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/settings.gradle
similarity index 100%
rename from 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/settings.gradle.kts
rename to 09_Centralizing_Dependency_Versions/D_Dependency_Locking/my-project/settings.gradle
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle.kts b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 51%
rename from 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index ee51231..69ecc88 100644
--- a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,10 +6,10 @@ group = "org.example.my-app"
 version = "0.1"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform()
     testLogging.showStandardStreams = true
 }
@@ -25,19 +25,19 @@ dependencies.constraints {
     implementation("org.apache.commons:commons-text:1.5")
 }
 
-val applicationRuntimeClasspath = configurations.create("applicationRuntimeClasspath") {
-    isCanBeResolved = true
-    isCanBeConsumed = false
+def appRuntimeClasspath = configurations.create("applicationRuntimeClasspath") {
+    canBeResolved = true
+    canBeConsumed = false
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_RUNTIME))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
     }
 }
 dependencies {
     applicationRuntimeClasspath("org.example.my-app:app")
 }
 configurations {
-    compileClasspath.get().shouldResolveConsistentlyWith(applicationRuntimeClasspath)
-    runtimeClasspath.get().shouldResolveConsistentlyWith(applicationRuntimeClasspath)
-    testCompileClasspath.get().shouldResolveConsistentlyWith(applicationRuntimeClasspath)
-    testRuntimeClasspath.get().shouldResolveConsistentlyWith(applicationRuntimeClasspath)
+    compileClasspath.shouldResolveConsistentlyWith(appRuntimeClasspath)
+    runtimeClasspath.shouldResolveConsistentlyWith(appRuntimeClasspath)
+    testCompileClasspath.shouldResolveConsistentlyWith(appRuntimeClasspath)
+    testRuntimeClasspath.shouldResolveConsistentlyWith(appRuntimeClasspath)
 }
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/10_Dependency_Version_Conflicts/my-build-logic/settings.gradle.kts b/10_Dependency_Version_Conflicts/my-build-logic/settings.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-build-logic/settings.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-build-logic/settings.gradle
diff --git a/10_Dependency_Version_Conflicts/my-other-project/settings.gradle.kts b/10_Dependency_Version_Conflicts/my-other-project/settings.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-other-project/settings.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-other-project/settings.gradle
diff --git a/10_Dependency_Version_Conflicts/my-project/app/build.gradle.kts b/10_Dependency_Version_Conflicts/my-project/app/build.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-project/app/build.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-project/app/build.gradle
diff --git a/10_Dependency_Version_Conflicts/my-project/business-logic/build.gradle.kts b/10_Dependency_Version_Conflicts/my-project/business-logic/build.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-project/business-logic/build.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-project/business-logic/build.gradle
diff --git a/10_Dependency_Version_Conflicts/my-project/data-model/build.gradle.kts b/10_Dependency_Version_Conflicts/my-project/data-model/build.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-project/data-model/build.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-project/data-model/build.gradle
diff --git a/10_Dependency_Version_Conflicts/my-project/settings.gradle.kts b/10_Dependency_Version_Conflicts/my-project/settings.gradle
similarity index 100%
rename from 10_Dependency_Version_Conflicts/my-project/settings.gradle.kts
rename to 10_Dependency_Version_Conflicts/my-project/settings.gradle
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle b/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle.kts b/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/11_Capability_Conflicts/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/metadata-rules.gradle b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/metadata-rules.gradle
new file mode 100644
index 0000000..4e7bf46
--- /dev/null
+++ b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/metadata-rules.gradle
@@ -0,0 +1,6 @@
+import myproject.metadatarules.Slf4JImplRule
+
+dependencies.components {
+    withModule("org.slf4j:slf4j-simple", Slf4JImplRule)
+    withModule("ch.qos.logback:logback-classic", Slf4JImplRule)
+}
\ No newline at end of file
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 90%
rename from 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 2fabd49..b803c9d 100644
--- a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -7,10 +7,10 @@ group = "org.example.my-app"
 version = "0.1"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform()
     testLogging.showStandardStreams = true
 }
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/myproject/metadatarules/Slf4JImplRule.kt b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/myproject/metadatarules/Slf4JImplRule.groovy
similarity index 67%
rename from 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/myproject/metadatarules/Slf4JImplRule.kt
rename to 11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/myproject/metadatarules/Slf4JImplRule.groovy
index 71e37a8..1cbdff8 100644
--- a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/myproject/metadatarules/Slf4JImplRule.kt
+++ b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/groovy/myproject/metadatarules/Slf4JImplRule.groovy
@@ -5,10 +5,11 @@ import org.gradle.api.artifacts.ComponentMetadataContext
 import org.gradle.api.artifacts.ComponentMetadataRule
 
 @CacheableRule
-abstract class Slf4JImplRule : ComponentMetadataRule {
+abstract class Slf4JImplRule implements ComponentMetadataRule {
 
-    override fun execute(context: ComponentMetadataContext) {
-        val version = context.details.id.version
+    @Override
+    void execute(ComponentMetadataContext context) {
+        def version = context.details.id.version
         context.details.allVariants {
             withCapabilities {
                 addCapability("org.slf4j", "slf4j-impl", version)
diff --git a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/metadata-rules.gradle.kts b/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/metadata-rules.gradle.kts
deleted file mode 100644
index 0de0851..0000000
--- a/11_Capability_Conflicts/my-build-logic/java-plugins/src/main/kotlin/metadata-rules.gradle.kts
+++ /dev/null
@@ -1,6 +0,0 @@
-import myproject.metadatarules.Slf4JImplRule
-
-dependencies.components {
-    withModule<Slf4JImplRule>("org.slf4j:slf4j-simple")
-    withModule<Slf4JImplRule>("ch.qos.logback:logback-classic")
-}
\ No newline at end of file
diff --git a/11_Capability_Conflicts/my-build-logic/settings.gradle.kts b/11_Capability_Conflicts/my-build-logic/settings.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-build-logic/settings.gradle.kts
rename to 11_Capability_Conflicts/my-build-logic/settings.gradle
diff --git a/11_Capability_Conflicts/my-other-project/settings.gradle.kts b/11_Capability_Conflicts/my-other-project/settings.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-other-project/settings.gradle.kts
rename to 11_Capability_Conflicts/my-other-project/settings.gradle
diff --git a/11_Capability_Conflicts/my-project/app/build.gradle.kts b/11_Capability_Conflicts/my-project/app/build.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-project/app/build.gradle.kts
rename to 11_Capability_Conflicts/my-project/app/build.gradle
diff --git a/11_Capability_Conflicts/my-project/business-logic/build.gradle.kts b/11_Capability_Conflicts/my-project/business-logic/build.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-project/business-logic/build.gradle.kts
rename to 11_Capability_Conflicts/my-project/business-logic/build.gradle
diff --git a/11_Capability_Conflicts/my-project/data-model/build.gradle.kts b/11_Capability_Conflicts/my-project/data-model/build.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-project/data-model/build.gradle.kts
rename to 11_Capability_Conflicts/my-project/data-model/build.gradle
diff --git a/11_Capability_Conflicts/my-project/settings.gradle.kts b/11_Capability_Conflicts/my-project/settings.gradle
similarity index 100%
rename from 11_Capability_Conflicts/my-project/settings.gradle.kts
rename to 11_Capability_Conflicts/my-project/settings.gradle
diff --git a/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle b/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle.kts b/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/12_Publishing_Libraries/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 84%
rename from 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 67543e3..7efad5f 100644
--- a/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -14,6 +14,6 @@ dependencies.constraints {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
diff --git a/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 51%
rename from 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
index 1e05927..f67ed82 100644
--- a/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ b/12_Publishing_Libraries/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -5,22 +5,23 @@ plugins {
 }
 
 publishing {
-    publications.create<MavenPublication>("lib").from(components["java"])
+    publications.create("lib", MavenPublication).from(components["java"])
 
-    repositories.maven("/tmp/test-repo")
+    repositories.maven { url = "/tmp/test-repo" }
 }
 
 // The above more verbose if you need to customize published 'variants':
 //
-// val javaComponent = components["java"] as AdhocComponentWithVariants
-// javaComponent.withVariantsFromConfiguration(configurations.runtimeElements.get()) {
+// def javaComponent = components["java"]
+// javaComponent.withVariantsFromConfiguration(configurations.runtimeElements) {
 //     // customize 'runtimeElements' variant here...
 // }
 // publishing {
-//     publications.create<MavenPublication>("lib").from(javaComponent)
+//     publications.create("lib", MavenPublication).from(javaComponent)
 //
-//     repositories.maven("/tmp/test-repo") {
+//     repositories.maven {
+//         url = "/tmp/test-repo"
 //         name = "myRepo"
-//         credentials(PasswordCredentials::class)
+//         credentials(PasswordCredentials)
 //     }
 // }
\ No newline at end of file
diff --git a/12_Publishing_Libraries/my-build-logic/settings.gradle.kts b/12_Publishing_Libraries/my-build-logic/settings.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-build-logic/settings.gradle.kts
rename to 12_Publishing_Libraries/my-build-logic/settings.gradle
diff --git a/12_Publishing_Libraries/my-other-project/settings.gradle.kts b/12_Publishing_Libraries/my-other-project/settings.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-other-project/settings.gradle.kts
rename to 12_Publishing_Libraries/my-other-project/settings.gradle
diff --git a/12_Publishing_Libraries/my-other-project/shared-utils/build.gradle.kts b/12_Publishing_Libraries/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-other-project/shared-utils/build.gradle.kts
rename to 12_Publishing_Libraries/my-other-project/shared-utils/build.gradle
diff --git a/12_Publishing_Libraries/my-project/app/build.gradle.kts b/12_Publishing_Libraries/my-project/app/build.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-project/app/build.gradle.kts
rename to 12_Publishing_Libraries/my-project/app/build.gradle
diff --git a/12_Publishing_Libraries/my-project/business-logic/build.gradle.kts b/12_Publishing_Libraries/my-project/business-logic/build.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-project/business-logic/build.gradle.kts
rename to 12_Publishing_Libraries/my-project/business-logic/build.gradle
diff --git a/12_Publishing_Libraries/my-project/data-model/build.gradle.kts b/12_Publishing_Libraries/my-project/data-model/build.gradle
similarity index 100%
rename from 12_Publishing_Libraries/my-project/data-model/build.gradle.kts
rename to 12_Publishing_Libraries/my-project/data-model/build.gradle
diff --git a/12_Publishing_Libraries/my-project/settings.gradle.kts b/12_Publishing_Libraries/my-project/settings.gradle
similarity index 81%
rename from 12_Publishing_Libraries/my-project/settings.gradle.kts
rename to 12_Publishing_Libraries/my-project/settings.gradle
index e1ef114..ebeadec 100644
--- a/12_Publishing_Libraries/my-project/settings.gradle.kts
+++ b/12_Publishing_Libraries/my-project/settings.gradle
@@ -1,14 +1,14 @@
 // Locations of Gradle plugins
 pluginManagement {
     repositories.gradlePluginPortal()
-    repositories.maven("/tmp/test-repo")
+    repositories.maven { url = "/tmp/test-repo" }
     includeBuild("../my-build-logic")
 }
 
 // Location of other components
 dependencyResolutionManagement {
     repositories.mavenCentral()
-    repositories.maven("/tmp/test-repo")
+    repositories.maven { url = "/tmp/test-repo" }
     includeBuild("../my-other-project") // <-- remove includeBuild() to use published version
     includeBuild(".")
 }
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle.kts b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
new file mode 100644
index 0000000..1800630
--- /dev/null
+++ b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -0,0 +1,22 @@
+plugins {
+    id("my-java-base")
+    id("application")
+}
+
+def sourcesPath = configurations.create("sourcesPath") {
+    canBeResolved = true
+    canBeConsumed = false
+    extendsFrom(configurations.implementation)
+    attributes {
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, "java-sources"))
+    }
+}
+
+def fullJavadoc = tasks.register("fullJavadoc", Javadoc) {
+    classpath = configurations.runtimeClasspath
+    source = sourcesPath.incoming.artifactView { lenient(true) }.files.asFileTree
+}
+
+tasks.named("build") {
+    dependsOn(fullJavadoc)
+}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
new file mode 100644
index 0000000..c4bea4e
--- /dev/null
+++ b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -0,0 +1,26 @@
+plugins {
+    id("java")
+}
+
+group = "org.example.my-app"
+version = "1.0"
+
+dependencies.constraints {
+    implementation("org.apache.commons:commons-lang3:3.9")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
+
+configurations.create("sourcesElements") {
+    canBeResolved = false
+    canBeConsumed = true
+    extendsFrom(configurations.implementation)
+    attributes {
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, "java-sources"))
+    }
+    sourceSets.main.java.srcDirs.forEach {
+        outgoing.artifact(it)
+    }
+}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
deleted file mode 100644
index aa01c23..0000000
--- a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ /dev/null
@@ -1,22 +0,0 @@
-plugins {
-    id("my-java-base")
-    id("application")
-}
-
-val sourcesPath = configurations.create("sourcesPath") {
-    isCanBeResolved = true
-    isCanBeConsumed = false
-    extendsFrom(configurations.implementation.get())
-    attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named("java-sources"))
-    }
-}
-
-val fullJavadoc = tasks.register<Javadoc>("fullJavadoc") {
-    classpath = configurations.runtimeClasspath.get()
-    source = sourcesPath.incoming.artifactView { lenient(true) }.files.asFileTree
-}
-
-tasks.build {
-    dependsOn(fullJavadoc)
-}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
deleted file mode 100644
index 75e63ef..0000000
--- a/13_Aggregating_Custom_Artifacts/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ /dev/null
@@ -1,26 +0,0 @@
-plugins {
-    id("java")
-}
-
-group = "org.example.my-app"
-version = "1.0"
-
-dependencies.constraints {
-    implementation("org.apache.commons:commons-lang3:3.9")
-}
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
-
-configurations.create("sourcesElements") {
-    isCanBeResolved = false
-    isCanBeConsumed = true
-    extendsFrom(configurations.implementation.get())
-    attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named("java-sources"))
-    }
-    sourceSets.main.get().java.srcDirs.forEach {
-        outgoing.artifact(it)
-    }
-}
diff --git a/13_Aggregating_Custom_Artifacts/my-build-logic/settings.gradle.kts b/13_Aggregating_Custom_Artifacts/my-build-logic/settings.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-build-logic/settings.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-build-logic/settings.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-other-project/settings.gradle.kts b/13_Aggregating_Custom_Artifacts/my-other-project/settings.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-other-project/settings.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-other-project/settings.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-project/app/build.gradle.kts b/13_Aggregating_Custom_Artifacts/my-project/app/build.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-project/app/build.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-project/app/build.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-project/business-logic/build.gradle.kts b/13_Aggregating_Custom_Artifacts/my-project/business-logic/build.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-project/business-logic/build.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-project/business-logic/build.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-project/data-model/build.gradle.kts b/13_Aggregating_Custom_Artifacts/my-project/data-model/build.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-project/data-model/build.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-project/data-model/build.gradle
diff --git a/13_Aggregating_Custom_Artifacts/my-project/settings.gradle.kts b/13_Aggregating_Custom_Artifacts/my-project/settings.gradle
similarity index 100%
rename from 13_Aggregating_Custom_Artifacts/my-project/settings.gradle.kts
rename to 13_Aggregating_Custom_Artifacts/my-project/settings.gradle
diff --git a/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle b/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle.kts b/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/14_Settings_Plugins/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 73%
rename from 14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 332939a..5527dc1 100644
--- a/14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -10,5 +10,5 @@ dependencies.constraints {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
diff --git a/14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 14_Settings_Plugins/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/14_Settings_Plugins/my-build-logic/settings.gradle.kts b/14_Settings_Plugins/my-build-logic/settings.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-build-logic/settings.gradle.kts
rename to 14_Settings_Plugins/my-build-logic/settings.gradle
diff --git a/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle b/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle.kts b/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/14_Settings_Plugins/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/18_Configuring_Testing/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/14_Settings_Plugins/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
similarity index 56%
rename from 18_Configuring_Testing/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
rename to 14_Settings_Plugins/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
index 39bca3e..7dc5613 100644
--- a/18_Configuring_Testing/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ b/14_Settings_Plugins/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -6,15 +6,15 @@ pluginManagement {
 // Location of other components
 dependencyResolutionManagement {
     repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
         includeBuild(it.path)
     }
 }
 
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
     include(it.name)
 }
diff --git a/14_Settings_Plugins/my-other-project/settings.gradle.kts b/14_Settings_Plugins/my-other-project/settings.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-other-project/settings.gradle.kts
rename to 14_Settings_Plugins/my-other-project/settings.gradle
diff --git a/14_Settings_Plugins/my-other-project/shared-utils/build.gradle.kts b/14_Settings_Plugins/my-other-project/shared-utils/build.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-other-project/shared-utils/build.gradle.kts
rename to 14_Settings_Plugins/my-other-project/shared-utils/build.gradle
diff --git a/14_Settings_Plugins/my-project/app/build.gradle.kts b/14_Settings_Plugins/my-project/app/build.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-project/app/build.gradle.kts
rename to 14_Settings_Plugins/my-project/app/build.gradle
diff --git a/14_Settings_Plugins/my-project/business-logic/build.gradle.kts b/14_Settings_Plugins/my-project/business-logic/build.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-project/business-logic/build.gradle.kts
rename to 14_Settings_Plugins/my-project/business-logic/build.gradle
diff --git a/14_Settings_Plugins/my-project/data-model/build.gradle.kts b/14_Settings_Plugins/my-project/data-model/build.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-project/data-model/build.gradle.kts
rename to 14_Settings_Plugins/my-project/data-model/build.gradle
diff --git a/14_Settings_Plugins/my-project/settings.gradle.kts b/14_Settings_Plugins/my-project/settings.gradle
similarity index 100%
rename from 14_Settings_Plugins/my-project/settings.gradle.kts
rename to 14_Settings_Plugins/my-project/settings.gradle
diff --git a/16_Source_Sets/my-android-project/app-android/build.gradle.kts b/16_Source_Sets/my-android-project/app-android/build.gradle
similarity index 100%
rename from 16_Source_Sets/my-android-project/app-android/build.gradle.kts
rename to 16_Source_Sets/my-android-project/app-android/build.gradle
diff --git a/16_Source_Sets/my-android-project/settings.gradle.kts b/16_Source_Sets/my-android-project/settings.gradle
similarity index 100%
rename from 16_Source_Sets/my-android-project/settings.gradle.kts
rename to 16_Source_Sets/my-android-project/settings.gradle
diff --git a/16_Source_Sets/my-build-logic/android-plugins/build.gradle.kts b/16_Source_Sets/my-build-logic/android-plugins/build.gradle
similarity index 75%
rename from 16_Source_Sets/my-build-logic/android-plugins/build.gradle.kts
rename to 16_Source_Sets/my-build-logic/android-plugins/build.gradle
index 191673c..6027c6b 100644
--- a/16_Source_Sets/my-build-logic/android-plugins/build.gradle.kts
+++ b/16_Source_Sets/my-build-logic/android-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/16_Source_Sets/my-build-logic/android-plugins/src/main/kotlin/my-android-application.gradle.kts b/16_Source_Sets/my-build-logic/android-plugins/src/main/groovy/my-android-application.gradle
similarity index 88%
rename from 16_Source_Sets/my-build-logic/android-plugins/src/main/kotlin/my-android-application.gradle.kts
rename to 16_Source_Sets/my-build-logic/android-plugins/src/main/groovy/my-android-application.gradle
index 9b2d346..e024418 100644
--- a/16_Source_Sets/my-build-logic/android-plugins/src/main/kotlin/my-android-application.gradle.kts
+++ b/16_Source_Sets/my-build-logic/android-plugins/src/main/groovy/my-android-application.gradle
@@ -15,7 +15,7 @@ android {
     }
 
     applicationVariants.matching { it.name == "debug" }.all {
-        sourceSets.find { it.name == "debug" }!!.apply {
+        sourceSets.find { it.name == "debug" }.with {
             // get and configure an Android 'SourceProvider' (Build Type and Flavor specific)
         }
     }
diff --git a/16_Source_Sets/my-build-logic/java-plugins/build.gradle b/16_Source_Sets/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/16_Source_Sets/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/16_Source_Sets/my-build-logic/java-plugins/build.gradle.kts b/16_Source_Sets/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/16_Source_Sets/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 67%
rename from 16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index e5407d9..01dad45 100644
--- a/16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -3,8 +3,8 @@ plugins {
     id("application")
 }
 
-tasks.register<JavaExec>("runJava17") {
-    classpath = configurations.runtimeClasspath.get() + files(tasks.jar)
+tasks.register("runJava17", JavaExec) {
+    classpath = configurations.runtimeClasspath + files(tasks.jar)
     javaLauncher.set(javaToolchains.launcherFor {
         languageVersion = JavaLanguageVersion.of(17)
     })
diff --git a/16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 51%
rename from 16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 857b728..d6f4be0 100644
--- a/16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -1,6 +1,5 @@
 import java.nio.file.Files
 import org.gradle.api.plugins.jvm.internal.JvmLanguageUtilities
-import org.gradle.kotlin.dsl.support.serviceOf
 
 plugins {
     id("java")
@@ -19,27 +18,27 @@ sourceSets.test {
 
 }
 
-val extraFeature = sourceSets.create("extraFeature")
-tasks.register<Jar>(extraFeature.jarTaskName) {
+def extraFeature = sourceSets.create("extraFeature")
+tasks.register(extraFeature.jarTaskName, Jar) {
     from(extraFeature.output)
     archiveClassifier.set("extra-feature")
 }
 
-val jvm = serviceOf<JvmLanguageUtilities>() // if this does not compile, use 'serviceOf<JvmEcosystemUtilities>()'
-jvm.registerJvmLanguageSourceDirectory(sourceSets.main.get(), "java17") {
-    compiledWithJava {
+def jvm = services.get(JvmLanguageUtilities)
+jvm.registerJvmLanguageSourceDirectory(sourceSets.main, "java17") {
+    it.compiledWithJava {
         javaCompiler.set(javaToolchains.compilerFor {
-            languageVersion.set(JavaLanguageVersion.of(17))
+            languageVersion = JavaLanguageVersion.of(17)
         })
-        classpath = sourceSets.main.get().compileClasspath
+        classpath = sourceSets.main.compileClasspath
         doLast {
-            val destRoot = destinationDirectory.get().asFile
-            val destVersions = File(destRoot, "META-INF/versions/17").also { it.mkdirs() }
-            destVersions.deleteRecursively()
+            def destRoot = destinationDirectory.get().asFile
+            def destVersions = new File(destRoot, "META-INF/versions/17")
+            destVersions.deleteDir()
             destVersions.mkdirs()
-            destRoot.listFiles()?.forEach {
+            destRoot.listFiles()?.each {
                 if (it.name != "META-INF") {
-                    Files.move(it.toPath(), File(destVersions, it.name).toPath())
+                    Files.move(it.toPath(), new File(destVersions, it.name).toPath())
                 }
             }
         }
@@ -48,7 +47,7 @@ jvm.registerJvmLanguageSourceDirectory(sourceSets.main.get(), "java17") {
 
 tasks.jar {
     manifest {
-        attributes("Multi-Release" to true)
+        attributes("Multi-Release": true)
     }
 }
 
@@ -62,6 +61,6 @@ dependencies {
 }
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
diff --git a/16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 16_Source_Sets/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 16_Source_Sets/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle.kts b/16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle
similarity index 77%
rename from 16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle.kts
rename to 16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle
index b34d438..ae49011 100644
--- a/16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle.kts
+++ b/16_Source_Sets/my-build-logic/kotlin-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/16_Source_Sets/my-build-logic/kotlin-plugins/src/main/kotlin/my-kotlin-multiplatform-lib.gradle.kts b/16_Source_Sets/my-build-logic/kotlin-plugins/src/main/groovy/my-kotlin-multiplatform-lib.gradle
similarity index 100%
rename from 16_Source_Sets/my-build-logic/kotlin-plugins/src/main/kotlin/my-kotlin-multiplatform-lib.gradle.kts
rename to 16_Source_Sets/my-build-logic/kotlin-plugins/src/main/groovy/my-kotlin-multiplatform-lib.gradle
diff --git a/16_Source_Sets/my-build-logic/settings.gradle.kts b/16_Source_Sets/my-build-logic/settings.gradle
similarity index 100%
rename from 16_Source_Sets/my-build-logic/settings.gradle.kts
rename to 16_Source_Sets/my-build-logic/settings.gradle
diff --git a/16_Source_Sets/my-build-logic/structure-plugins/build.gradle b/16_Source_Sets/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/16_Source_Sets/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/16_Source_Sets/my-build-logic/structure-plugins/build.gradle.kts b/16_Source_Sets/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/16_Source_Sets/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/16_Source_Sets/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/16_Source_Sets/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
similarity index 64%
rename from 16_Source_Sets/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
rename to 16_Source_Sets/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
index f1751fc..3f4b784 100644
--- a/16_Source_Sets/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ b/16_Source_Sets/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -8,17 +8,17 @@ pluginManagement {
 dependencyResolutionManagement {
     repositories.mavenCentral()
     repositories.google()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
         if (it.path != rootDir.path) {
             includeBuild(it.path)
         }
     }
 }
 
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
     include(it.name)
 }
diff --git a/16_Source_Sets/my-kotlin-multi-platform-project/settings.gradle.kts b/16_Source_Sets/my-kotlin-multi-platform-project/settings.gradle
similarity index 100%
rename from 16_Source_Sets/my-kotlin-multi-platform-project/settings.gradle.kts
rename to 16_Source_Sets/my-kotlin-multi-platform-project/settings.gradle
diff --git a/16_Source_Sets/my-kotlin-multi-platform-project/utils-kotlin/build.gradle.kts b/16_Source_Sets/my-kotlin-multi-platform-project/utils-kotlin/build.gradle
similarity index 100%
rename from 16_Source_Sets/my-kotlin-multi-platform-project/utils-kotlin/build.gradle.kts
rename to 16_Source_Sets/my-kotlin-multi-platform-project/utils-kotlin/build.gradle
diff --git a/16_Source_Sets/my-project/app/build.gradle.kts b/16_Source_Sets/my-project/app/build.gradle
similarity index 100%
rename from 16_Source_Sets/my-project/app/build.gradle.kts
rename to 16_Source_Sets/my-project/app/build.gradle
diff --git a/16_Source_Sets/my-project/business-logic/build.gradle.kts b/16_Source_Sets/my-project/business-logic/build.gradle
similarity index 100%
rename from 16_Source_Sets/my-project/business-logic/build.gradle.kts
rename to 16_Source_Sets/my-project/business-logic/build.gradle
diff --git a/16_Source_Sets/my-project/data-model/build.gradle.kts b/16_Source_Sets/my-project/data-model/build.gradle
similarity index 100%
rename from 16_Source_Sets/my-project/data-model/build.gradle.kts
rename to 16_Source_Sets/my-project/data-model/build.gradle
diff --git a/16_Source_Sets/my-project/settings.gradle.kts b/16_Source_Sets/my-project/settings.gradle
similarity index 100%
rename from 16_Source_Sets/my-project/settings.gradle.kts
rename to 16_Source_Sets/my-project/settings.gradle
diff --git a/17_Feature_Variants/my-build-logic/java-plugins/build.gradle b/17_Feature_Variants/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/17_Feature_Variants/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/17_Feature_Variants/my-build-logic/java-plugins/build.gradle.kts b/17_Feature_Variants/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/17_Feature_Variants/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 66%
rename from 17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index abf9b4b..d8f6c1e 100644
--- a/17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,11 +6,11 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 tasks.compileJava {
-    options.compilerArgs = listOf("-parameters")
+    options.compilerArgs = ["-parameters"]
 }
 
 // Centralized versions
diff --git a/17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 69%
rename from 17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
index 6e1983d..87583f0 100644
--- a/17_Feature_Variants/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ b/17_Feature_Variants/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -3,8 +3,8 @@ plugins {
     id("java-library")
 }
 
-val json = sourceSets.create("json")
-val xml = sourceSets.create("xml")
+def json = sourceSets.create("json")
+def xml = sourceSets.create("xml")
 
 // java.registerFeature(json.name) {
 //     usingSourceSet(json)
@@ -13,19 +13,19 @@ val xml = sourceSets.create("xml")
 // }
 
 // Setting up what 'registerFeature(json.name)' ↑ would do step-by-step
-tasks.register<Jar>(json.jarTaskName) {
+tasks.register(json.jarTaskName, Jar) {
     from(json.output)
     archiveClassifier.set(json.name)
 }
 
-val apiElements = configurations.create(json.apiElementsConfigurationName) {
-    isCanBeResolved = false
-    isCanBeConsumed = true
+def apiElements = configurations.create(json.apiElementsConfigurationName) {
+    canBeResolved = false
+    canBeConsumed = true
 
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_API))
-        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.LIBRARY))
-        attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements.JAR))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_API))
+        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, Category.LIBRARY))
+        attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements, LibraryElements.JAR))
     }
 
     extendsFrom(configurations.getByName(json.implementationConfigurationName))
@@ -36,14 +36,14 @@ val apiElements = configurations.create(json.apiElementsConfigurationName) {
     outgoing.capability("${project.group}:${project.name}-serialization:${project.version}")
 }
 
-val runtimeElements = configurations.create(json.runtimeElementsConfigurationName) {
-    isCanBeResolved = false
-    isCanBeConsumed = true
+def runtimeElements = configurations.create(json.runtimeElementsConfigurationName) {
+    canBeResolved = false
+    canBeConsumed = true
 
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_RUNTIME))
-        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.LIBRARY))
-        attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements.JAR))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
+        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, Category.LIBRARY))
+        attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements, LibraryElements.JAR))
     }
 
     extendsFrom(configurations.getByName(json.implementationConfigurationName))
@@ -54,7 +54,7 @@ val runtimeElements = configurations.create(json.runtimeElementsConfigurationNam
     outgoing.capability("${project.group}:${project.name}-serialization:${project.version}")
 }
 
-val javaComponent = components["java"] as AdhocComponentWithVariants
+def javaComponent = components["java"]
 javaComponent.addVariantsFromConfiguration(apiElements) {
     mapToOptional()
 }
@@ -72,6 +72,6 @@ java.registerFeature(xml.name) {
 
 // Centralized versions
 dependencies {
-    "jsonImplementation"(platform("com.fasterxml.jackson:jackson-bom:2.13.3"))
-    "xmlImplementation"(platform("com.fasterxml.jackson:jackson-bom:2.13.3"))
+    jsonImplementation(platform("com.fasterxml.jackson:jackson-bom:2.13.3"))
+    xmlImplementation(platform("com.fasterxml.jackson:jackson-bom:2.13.3"))
 }
diff --git a/17_Feature_Variants/my-build-logic/settings.gradle.kts b/17_Feature_Variants/my-build-logic/settings.gradle
similarity index 100%
rename from 17_Feature_Variants/my-build-logic/settings.gradle.kts
rename to 17_Feature_Variants/my-build-logic/settings.gradle
diff --git a/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle b/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle.kts b/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/17_Feature_Variants/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/19_The_Test_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/17_Feature_Variants/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
similarity index 56%
rename from 19_The_Test_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
rename to 17_Feature_Variants/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
index 39bca3e..7dc5613 100644
--- a/19_The_Test_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ b/17_Feature_Variants/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -6,15 +6,15 @@ pluginManagement {
 // Location of other components
 dependencyResolutionManagement {
     repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
         includeBuild(it.path)
     }
 }
 
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
     include(it.name)
 }
diff --git a/17_Feature_Variants/my-project/app/build.gradle.kts b/17_Feature_Variants/my-project/app/build.gradle
similarity index 100%
rename from 17_Feature_Variants/my-project/app/build.gradle.kts
rename to 17_Feature_Variants/my-project/app/build.gradle
diff --git a/17_Feature_Variants/my-project/business-logic/build.gradle.kts b/17_Feature_Variants/my-project/business-logic/build.gradle
similarity index 100%
rename from 17_Feature_Variants/my-project/business-logic/build.gradle.kts
rename to 17_Feature_Variants/my-project/business-logic/build.gradle
diff --git a/17_Feature_Variants/my-project/data-model/build.gradle.kts b/17_Feature_Variants/my-project/data-model/build.gradle
similarity index 100%
rename from 17_Feature_Variants/my-project/data-model/build.gradle.kts
rename to 17_Feature_Variants/my-project/data-model/build.gradle
diff --git a/17_Feature_Variants/my-project/settings.gradle.kts b/17_Feature_Variants/my-project/settings.gradle
similarity index 100%
rename from 17_Feature_Variants/my-project/settings.gradle.kts
rename to 17_Feature_Variants/my-project/settings.gradle
diff --git a/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle b/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle.kts b/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/18_Configuring_Testing/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 83%
rename from 18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 558b893..55431eb 100644
--- a/18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,17 +6,17 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 // === Setup without using Test Suites convenient API
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform() // JUnit5
 }
 
-val integrationTest = sourceSets.create("integrationTest")
+def integrationTest = sourceSets.create("integrationTest")
 
-tasks.register<Test>(integrationTest.name) {
+tasks.register(integrationTest.name, Test) {
     classpath = integrationTest.runtimeClasspath
     testClassesDirs = integrationTest.output.classesDirs
 
@@ -28,10 +28,10 @@ tasks.register<Test>(integrationTest.name) {
 
 // === Alternative: use Test Suites API
 // testing {
-//     suites.getByName<JvmTestSuite>("test") {
+//     suites.getByName("test") {
 //         useJUnitJupiter()
 //     }
-//     suites.create<JvmTestSuite>("integrationTest") {
+//     suites.create("integrationTest", JvmTestSuite) {
 //         // useJUnitJupiter() <- default for new suites
 //         dependencies {
 //             // Alternatives notation for "integrationTestImplementation(...)"
@@ -42,9 +42,8 @@ tasks.register<Test>(integrationTest.name) {
 //             // Source Set configuration
 //         }
 //         targets.all {
-//             testTask {
+//             testTask.configure {
 //                 options {
-//                     this as JUnitPlatformOptions
 //                     excludeTags("slow")
 //                 }
 //             }
@@ -53,7 +52,7 @@ tasks.register<Test>(integrationTest.name) {
 // }
 // ===
 
-tasks.register<Test>("integrationTestSlow") {
+tasks.register("integrationTestSlow", Test) {
     classpath = sourceSets["integrationTest"].runtimeClasspath
     testClassesDirs = sourceSets["integrationTest"].output.classesDirs
 
diff --git a/18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 18_Configuring_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/18_Configuring_Testing/my-build-logic/settings.gradle.kts b/18_Configuring_Testing/my-build-logic/settings.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-build-logic/settings.gradle.kts
rename to 18_Configuring_Testing/my-build-logic/settings.gradle
diff --git a/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle b/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle.kts b/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/18_Configuring_Testing/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/17_Feature_Variants/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/18_Configuring_Testing/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
similarity index 56%
rename from 17_Feature_Variants/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
rename to 18_Configuring_Testing/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
index 39bca3e..7dc5613 100644
--- a/17_Feature_Variants/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ b/18_Configuring_Testing/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -6,15 +6,15 @@ pluginManagement {
 // Location of other components
 dependencyResolutionManagement {
     repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
         includeBuild(it.path)
     }
 }
 
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
     include(it.name)
 }
diff --git a/18_Configuring_Testing/my-project/app/build.gradle.kts b/18_Configuring_Testing/my-project/app/build.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-project/app/build.gradle.kts
rename to 18_Configuring_Testing/my-project/app/build.gradle
diff --git a/18_Configuring_Testing/my-project/business-logic/build.gradle.kts b/18_Configuring_Testing/my-project/business-logic/build.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-project/business-logic/build.gradle.kts
rename to 18_Configuring_Testing/my-project/business-logic/build.gradle
diff --git a/18_Configuring_Testing/my-project/data-model/build.gradle.kts b/18_Configuring_Testing/my-project/data-model/build.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-project/data-model/build.gradle.kts
rename to 18_Configuring_Testing/my-project/data-model/build.gradle
diff --git a/18_Configuring_Testing/my-project/settings.gradle.kts b/18_Configuring_Testing/my-project/settings.gradle
similarity index 100%
rename from 18_Configuring_Testing/my-project/settings.gradle.kts
rename to 18_Configuring_Testing/my-project/settings.gradle
diff --git a/19_The_Test_Task/my-build-logic/java-plugins/build.gradle b/19_The_Test_Task/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/19_The_Test_Task/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/19_The_Test_Task/my-build-logic/java-plugins/build.gradle.kts b/19_The_Test_Task/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/19_The_Test_Task/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 83%
rename from 19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 65aa7fb..9a6c8b3 100644
--- a/19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,7 +6,7 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies {
@@ -25,15 +25,14 @@ tasks.test {
     minHeapSize = "1g" // aka -Xms
 
     // jvmArgs("-XX:+HeapDumpOnOutOfMemoryError")
-    jvmArgumentProviders.add(CommandLineArgumentProvider {
-        listOf("-XX:+HeapDumpOnOutOfMemoryError")
-    })
+    jvmArgumentProviders.add({
+        ["-XX:+HeapDumpOnOutOfMemoryError"]
+    } as CommandLineArgumentProvider)
 
     systemProperty("file.encoding", "UTF-8")
     systemProperty("java.awt.headless", "true")
 
     options {
-        this as JUnitPlatformOptions
         excludeTags("memoryHeavy")
     }
 
diff --git a/19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 19_The_Test_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 19_The_Test_Task/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/19_The_Test_Task/my-build-logic/settings.gradle.kts b/19_The_Test_Task/my-build-logic/settings.gradle
similarity index 100%
rename from 19_The_Test_Task/my-build-logic/settings.gradle.kts
rename to 19_The_Test_Task/my-build-logic/settings.gradle
diff --git a/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle b/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle.kts b/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/19_The_Test_Task/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/14_Settings_Plugins/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/19_The_Test_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
similarity index 56%
rename from 14_Settings_Plugins/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
rename to 19_The_Test_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
index 39bca3e..7dc5613 100644
--- a/14_Settings_Plugins/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ b/19_The_Test_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -6,15 +6,15 @@ pluginManagement {
 // Location of other components
 dependencyResolutionManagement {
     repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
         includeBuild(it.path)
     }
 }
 
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
     include(it.name)
 }
diff --git a/19_The_Test_Task/my-project/app/build.gradle.kts b/19_The_Test_Task/my-project/app/build.gradle
similarity index 100%
rename from 19_The_Test_Task/my-project/app/build.gradle.kts
rename to 19_The_Test_Task/my-project/app/build.gradle
diff --git a/19_The_Test_Task/my-project/business-logic/build.gradle.kts b/19_The_Test_Task/my-project/business-logic/build.gradle
similarity index 100%
rename from 19_The_Test_Task/my-project/business-logic/build.gradle.kts
rename to 19_The_Test_Task/my-project/business-logic/build.gradle
diff --git a/19_The_Test_Task/my-project/data-model/build.gradle.kts b/19_The_Test_Task/my-project/data-model/build.gradle
similarity index 100%
rename from 19_The_Test_Task/my-project/data-model/build.gradle.kts
rename to 19_The_Test_Task/my-project/data-model/build.gradle
diff --git a/19_The_Test_Task/my-project/settings.gradle.kts b/19_The_Test_Task/my-project/settings.gradle
similarity index 100%
rename from 19_The_Test_Task/my-project/settings.gradle.kts
rename to 19_The_Test_Task/my-project/settings.gradle
diff --git a/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle b/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle.kts b/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/20_Test_Fixtures/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 89%
rename from 20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 9134435..f9e2c50 100644
--- a/20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,7 +6,7 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 tasks.test {
diff --git a/20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 81%
rename from 20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
index e6e5a41..6588a9a 100644
--- a/20_Test_Fixtures/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ b/20_Test_Fixtures/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -4,7 +4,7 @@ plugins {
     id("java-test-fixtures")
 }
 
-val test = sourceSets.test.get()
+def test = sourceSets.test
 java.registerFeature(test.name) {
     usingSourceSet(test)
 }
diff --git a/20_Test_Fixtures/my-build-logic/settings.gradle.kts b/20_Test_Fixtures/my-build-logic/settings.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-build-logic/settings.gradle.kts
rename to 20_Test_Fixtures/my-build-logic/settings.gradle
diff --git a/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle b/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle.kts b/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/20_Test_Fixtures/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle b/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
new file mode 100644
index 0000000..7dc5613
--- /dev/null
+++ b/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -0,0 +1,20 @@
+// Locations of Gradle plugins
+pluginManagement {
+    repositories.gradlePluginPortal()
+}
+
+// Location of other components
+dependencyResolutionManagement {
+    repositories.mavenCentral()
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
+        includeBuild(it.path)
+    }
+}
+
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
+    include(it.name)
+}
diff --git a/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
deleted file mode 100644
index 39bca3e..0000000
--- a/20_Test_Fixtures/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-// Locations of Gradle plugins
-pluginManagement {
-    repositories.gradlePluginPortal()
-}
-
-// Location of other components
-dependencyResolutionManagement {
-    repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
-        includeBuild(it.path)
-    }
-}
-
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
-    include(it.name)
-}
diff --git a/20_Test_Fixtures/my-project/app/build.gradle.kts b/20_Test_Fixtures/my-project/app/build.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-project/app/build.gradle.kts
rename to 20_Test_Fixtures/my-project/app/build.gradle
diff --git a/20_Test_Fixtures/my-project/business-logic/build.gradle.kts b/20_Test_Fixtures/my-project/business-logic/build.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-project/business-logic/build.gradle.kts
rename to 20_Test_Fixtures/my-project/business-logic/build.gradle
diff --git a/20_Test_Fixtures/my-project/data-model/build.gradle.kts b/20_Test_Fixtures/my-project/data-model/build.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-project/data-model/build.gradle.kts
rename to 20_Test_Fixtures/my-project/data-model/build.gradle
diff --git a/20_Test_Fixtures/my-project/settings.gradle.kts b/20_Test_Fixtures/my-project/settings.gradle
similarity index 100%
rename from 20_Test_Fixtures/my-project/settings.gradle.kts
rename to 20_Test_Fixtures/my-project/settings.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 63%
rename from 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index e7c1a71..779be31 100644
--- a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -6,16 +6,16 @@ plugins {
 }
 
 // Integrate INTEGRATION_TEST results into the aggregated UNIT_TEST coverage results
-tasks.testCodeCoverageReport {
+tasks.named("testCodeCoverageReport") {
     executionData.from(
-        configurations.aggregateCodeCoverageReportResults.get()
+        configurations.aggregateCodeCoverageReportResults
                 .incoming.artifactView {
                     lenient(true)
                     withVariantReselection()
                     attributes {
-                        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.VERIFICATION))
-                        attribute(TestSuiteType.TEST_SUITE_TYPE_ATTRIBUTE, objects.named(TestSuiteType.INTEGRATION_TEST))
-                        attribute(VerificationType.VERIFICATION_TYPE_ATTRIBUTE, objects.named(VerificationType.JACOCO_RESULTS))
+                        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, Category.VERIFICATION))
+                        attribute(TestSuiteType.TEST_SUITE_TYPE_ATTRIBUTE, objects.named(TestSuiteType, TestSuiteType.INTEGRATION_TEST))
+                        attribute(VerificationType.VERIFICATION_TYPE_ATTRIBUTE, objects.named(VerificationType, VerificationType.JACOCO_RESULTS))
                         attribute(ArtifactTypeDefinition.ARTIFACT_TYPE_ATTRIBUTE, ArtifactTypeDefinition.BINARY_DATA_TYPE)
                     }
                 }.files
@@ -23,22 +23,22 @@ tasks.testCodeCoverageReport {
 }
 
 // Integrate INTEGRATION_TEST results into the aggregated UNIT_TEST test results
-tasks.testAggregateTestReport {
+tasks.named("testAggregateTestReport") {
     testResults.from(
-        configurations.aggregateTestReportResults.get()
+        configurations.aggregateTestReportResults
             .incoming.artifactView {
                 lenient(true)
                 withVariantReselection()
                 attributes {
-                    attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.VERIFICATION))
-                    attribute(TestSuiteType.TEST_SUITE_TYPE_ATTRIBUTE, objects.named(TestSuiteType.INTEGRATION_TEST))
-                    attribute(VerificationType.VERIFICATION_TYPE_ATTRIBUTE, objects.named(VerificationType.TEST_RESULTS))
+                    attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, Category.VERIFICATION))
+                    attribute(TestSuiteType.TEST_SUITE_TYPE_ATTRIBUTE, objects.named(TestSuiteType, TestSuiteType.INTEGRATION_TEST))
+                    attribute(VerificationType.VERIFICATION_TYPE_ATTRIBUTE, objects.named(VerificationType, VerificationType.TEST_RESULTS))
                 }
             }.files
     )
 }
 
-tasks.check {
-    dependsOn(tasks.testAggregateTestReport)
-    dependsOn(tasks.testCodeCoverageReport)
+tasks.named("check") {
+    dependsOn(tasks.named("testAggregateTestReport"))
+    dependsOn(tasks.named("testCodeCoverageReport"))
 }
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 71%
rename from 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 000627a..1ca440e 100644
--- a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -7,13 +7,13 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-testing.suites.register<JvmTestSuite>("integrationTest") {
-    testType.set(TestSuiteType.INTEGRATION_TEST)
+testing.suites.register("integrationTest", JvmTestSuite) {
+    testType = TestSuiteType.INTEGRATION_TEST
     configurations[sources.implementationConfigurationName].extendsFrom(
-        configurations.implementation.get()
+        configurations.implementation
     )
 }
 
@@ -21,7 +21,7 @@ jacoco {
     // ...
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform { // JUnit5
         excludeTags("slow")
     }
@@ -30,9 +30,9 @@ tasks.test {
     }
 }
 
-val testSlow = tasks.register<Test>("testSlow") {
-    testClassesDirs = sourceSets.test.get().output.classesDirs
-    classpath = sourceSets.test.get().runtimeClasspath
+def testSlow = tasks.register("testSlow", Test) {
+    testClassesDirs = sourceSets.test.output.classesDirs
+    classpath = sourceSets.test.runtimeClasspath
     useJUnitPlatform {
         includeTags("slow")
     }
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/settings.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/settings.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-build-logic/settings.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-build-logic/settings.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
new file mode 100644
index 0000000..7dc5613
--- /dev/null
+++ b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -0,0 +1,20 @@
+// Locations of Gradle plugins
+pluginManagement {
+    repositories.gradlePluginPortal()
+}
+
+// Location of other components
+dependencyResolutionManagement {
+    repositories.mavenCentral()
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
+        includeBuild(it.path)
+    }
+}
+
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
+    include(it.name)
+}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
deleted file mode 100644
index 39bca3e..0000000
--- a/21_Test_and_Code_Coverage_Reporting/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-// Locations of Gradle plugins
-pluginManagement {
-    repositories.gradlePluginPortal()
-}
-
-// Location of other components
-dependencyResolutionManagement {
-    repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
-        includeBuild(it.path)
-    }
-}
-
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
-    include(it.name)
-}
diff --git a/21_Test_and_Code_Coverage_Reporting/my-project/app/build.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-project/app/build.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-project/app/build.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-project/app/build.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-project/business-logic/build.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-project/business-logic/build.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-project/business-logic/build.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-project/business-logic/build.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-project/data-model/build.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-project/data-model/build.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-project/data-model/build.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-project/data-model/build.gradle
diff --git a/21_Test_and_Code_Coverage_Reporting/my-project/settings.gradle.kts b/21_Test_and_Code_Coverage_Reporting/my-project/settings.gradle
similarity index 100%
rename from 21_Test_and_Code_Coverage_Reporting/my-project/settings.gradle.kts
rename to 21_Test_and_Code_Coverage_Reporting/my-project/settings.gradle
diff --git a/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle b/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..3eca95a
--- /dev/null
+++ b/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
\ No newline at end of file
diff --git a/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/22_The_JavaCompile_Task/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 87%
rename from 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 89696ad..8da3918 100644
--- a/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,11 +6,11 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
-tasks.withType<JavaCompile>().configureEach {
-    options.isFork = true
+tasks.withType(JavaCompile).configureEach {
+    options.fork = true
     // options.forkOptions.jvmArgumentProviders.add { listOf("-Xmx4g") }
     options.forkOptions.memoryMaximumSize = "4g"
 
@@ -24,7 +24,7 @@ tasks.withType<JavaCompile>().configureEach {
 }
 
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform() // JUnit5
 }
 
diff --git a/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 22_The_JavaCompile_Task/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/22_The_JavaCompile_Task/my-build-logic/settings.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/settings.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-build-logic/settings.gradle.kts
rename to 22_The_JavaCompile_Task/my-build-logic/settings.gradle
diff --git a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
new file mode 100644
index 0000000..5526075
--- /dev/null
+++ b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -0,0 +1,20 @@
+// Locations of Gradle plugins
+pluginManagement {
+    repositories.gradlePluginPortal()
+}
+
+// Location of other components
+dependencyResolutionManagement {
+    repositories.mavenCentral()
+    rootDir.parentFile.listFiles()?.findAll {
+        new File(it, "settings.gradle").exists()
+    }?.each {
+        includeBuild(it.path)
+    }
+}
+
+rootDir.listFiles()?.findAll {
+    new File(it, "build.gradle").exists()
+}?.each {
+    include(it.name)
+}
\ No newline at end of file
diff --git a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
deleted file mode 100644
index 39bca3e..0000000
--- a/22_The_JavaCompile_Task/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-// Locations of Gradle plugins
-pluginManagement {
-    repositories.gradlePluginPortal()
-}
-
-// Location of other components
-dependencyResolutionManagement {
-    repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists()
-    }?.forEach {
-        includeBuild(it.path)
-    }
-}
-
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists()
-}?.forEach {
-    include(it.name)
-}
diff --git a/22_The_JavaCompile_Task/my-project/app/build.gradle.kts b/22_The_JavaCompile_Task/my-project/app/build.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-project/app/build.gradle.kts
rename to 22_The_JavaCompile_Task/my-project/app/build.gradle
diff --git a/22_The_JavaCompile_Task/my-project/business-logic/build.gradle.kts b/22_The_JavaCompile_Task/my-project/business-logic/build.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-project/business-logic/build.gradle.kts
rename to 22_The_JavaCompile_Task/my-project/business-logic/build.gradle
diff --git a/22_The_JavaCompile_Task/my-project/data-model/build.gradle.kts b/22_The_JavaCompile_Task/my-project/data-model/build.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-project/data-model/build.gradle.kts
rename to 22_The_JavaCompile_Task/my-project/data-model/build.gradle
diff --git a/22_The_JavaCompile_Task/my-project/settings.gradle.kts b/22_The_JavaCompile_Task/my-project/settings.gradle
similarity index 100%
rename from 22_The_JavaCompile_Task/my-project/settings.gradle.kts
rename to 22_The_JavaCompile_Task/my-project/settings.gradle
diff --git a/23_Caching/my-build-logic/java-plugins/build.gradle b/23_Caching/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/23_Caching/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/23_Caching/my-build-logic/java-plugins/build.gradle.kts b/23_Caching/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/23_Caching/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 75%
rename from 23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 3e4844d..db0e08a 100644
--- a/23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,7 +6,7 @@ group = "org.example.my-app"
 version = "1.0"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 // Centralized versions
diff --git a/23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 23_Caching/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 23_Caching/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/23_Caching/my-build-logic/settings.gradle.kts b/23_Caching/my-build-logic/settings.gradle
similarity index 100%
rename from 23_Caching/my-build-logic/settings.gradle.kts
rename to 23_Caching/my-build-logic/settings.gradle
diff --git a/23_Caching/my-project/app/build.gradle.kts b/23_Caching/my-project/app/build.gradle
similarity index 100%
rename from 23_Caching/my-project/app/build.gradle.kts
rename to 23_Caching/my-project/app/build.gradle
diff --git a/23_Caching/my-project/business-logic/build.gradle.kts b/23_Caching/my-project/business-logic/build.gradle
similarity index 100%
rename from 23_Caching/my-project/business-logic/build.gradle.kts
rename to 23_Caching/my-project/business-logic/build.gradle
diff --git a/23_Caching/my-project/data-model/build.gradle.kts b/23_Caching/my-project/data-model/build.gradle
similarity index 100%
rename from 23_Caching/my-project/data-model/build.gradle.kts
rename to 23_Caching/my-project/data-model/build.gradle
diff --git a/23_Caching/my-project/settings.gradle.kts b/23_Caching/my-project/settings.gradle
similarity index 55%
rename from 23_Caching/my-project/settings.gradle.kts
rename to 23_Caching/my-project/settings.gradle
index dba363a..83b00c5 100644
--- a/23_Caching/my-project/settings.gradle.kts
+++ b/23_Caching/my-project/settings.gradle
@@ -5,20 +5,20 @@ dependencyResolutionManagement {
     repositories.mavenCentral()
 }
 
-rootDir.listFiles()?.filter { File(it, "build.gradle.kts").exists() }?.forEach {
+rootDir.listFiles().findAll { new File(it, "build.gradle").exists() }.each {
     include(it.name)
 }
 
-val runsOnCI = providers.environmentVariable("CI").getOrElse("false").toBoolean()
+def runsOnCI = providers.environmentVariable("CI").getOrElse("false").toBoolean()
 buildCache {
-    remote<HttpBuildCache> {
-        isEnabled = false // because this example cache does not actually exist :)
-        url = uri("https://onepiece.software/cache/")
+    remote(HttpBuildCache) {
+        enabled = false // because this example cache does not actually exist :)
+        url = "https://onepiece.software/cache/"
         credentials {
             username = "jendrik"
             password = "..."
         }
-        isPush = runsOnCI
+        push = runsOnCI
     }
     local {
         // isEnabled = false
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..6784052
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id 'groovy-gradle-plugin'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
new file mode 100644
index 0000000..69394c5
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -0,0 +1,4 @@
+plugins {
+    id 'my-java-base'
+    id 'application'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
new file mode 100644
index 0000000..c75f7ba
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -0,0 +1,23 @@
+plugins {
+    id 'java'
+}
+
+group = 'org.example.my-app'
+version = '1.0'
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+}
+
+tasks.named('test') { // tasks.test -> tasks.getByName('test') -- only in Groovy DSL
+    useJUnitPlatform()
+}
+
+// Centralized versions
+dependencies.constraints {
+    implementation 'org.apache.commons:commons-lang3:3.9'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
new file mode 100644
index 0000000..27b8520
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
@@ -0,0 +1,4 @@
+plugins {
+    id 'my-java-base'
+    id 'java-library'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
deleted file mode 100644
index b8a5d7a..0000000
--- a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ /dev/null
@@ -1,23 +0,0 @@
-plugins {
-    id("java")
-}
-
-group = "org.example.my-app"
-version = "1.0"
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
-
-tasks.withType<JavaCompile>().configureEach {
-    options.encoding = "UTF-8"
-}
-
-tasks.test {
-    useJUnitPlatform()
-}
-
-// Centralized versions
-dependencies.constraints {
-    implementation("org.apache.commons:commons-lang3:3.9")
-}
diff --git a/25_Using_Java_to_configure_builds/my-build-logic/settings.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle
similarity index 58%
rename from 25_Using_Java_to_configure_builds/my-build-logic/settings.gradle.kts
rename to 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle
index a0a7f16..3f6e2c1 100644
--- a/25_Using_Java_to_configure_builds/my-build-logic/settings.gradle.kts
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle
@@ -2,5 +2,5 @@ dependencyResolutionManagement {
     repositories.gradlePluginPortal()
 }
 
-include("structure-plugins")
-include("java-plugins")
+include 'structure-plugins'
+include 'java-plugins'
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle
new file mode 100644
index 0000000..6784052
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id 'groovy-gradle-plugin'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
new file mode 100644
index 0000000..1067a96
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/groovy/my-project-structure.settings.gradle
@@ -0,0 +1,20 @@
+// Locations of Gradle plugins
+pluginManagement {
+    repositories.gradlePluginPortal()
+}
+
+// Location of other components
+dependencyResolutionManagement {
+    repositories.mavenCentral()
+    rootDir.parentFile.listFiles().findAll {
+        new File(it, 'settings.gradle.kts').exists() || new File(it, 'settings.gradle').exists()
+    }.each {
+        includeBuild it.path
+    }
+}
+
+rootDir.listFiles().findAll {
+    new File(it, 'build.gradle.kts').exists() || new File(it, 'build.gradle').exists()
+}.each {
+    include it.name
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
deleted file mode 100644
index c370fd1..0000000
--- a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/structure-plugins/src/main/kotlin/my-project-structure.settings.gradle.kts
+++ /dev/null
@@ -1,20 +0,0 @@
-// Locations of Gradle plugins
-pluginManagement {
-    repositories.gradlePluginPortal()
-}
-
-// Location of other components
-dependencyResolutionManagement {
-    repositories.mavenCentral()
-    rootDir.parentFile.listFiles()?.filter {
-        File(it, "settings.gradle.kts").exists() || File(it, "settings.gradle").exists()
-    }?.forEach {
-        includeBuild(it.path)
-    }
-}
-
-rootDir.listFiles()?.filter {
-    File(it, "build.gradle.kts").exists() || File(it, "build.gradle").exists()
-}?.forEach {
-    include(it.name)
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle
new file mode 100644
index 0000000..9a5696d
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle
@@ -0,0 +1,11 @@
+plugins {
+    id 'my-java-application'
+}
+
+application {
+    mainClass = 'myproject.MyApplication'
+}
+
+dependencies {
+    implementation 'org.example.my-app:business-logic'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle.kts b/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle.kts
deleted file mode 100644
index de679b3..0000000
--- a/24_Kotlin_DSL_and_Groovy_DSL/my-project/app/build.gradle.kts
+++ /dev/null
@@ -1,11 +0,0 @@
-plugins {
-    id("my-java-application")
-}
-
-application {
-    mainClass.set("myproject.MyApplication")
-}
-
-dependencies {
-    implementation("org.example.my-app:business-logic")
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle
new file mode 100644
index 0000000..ae1f16a
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle
@@ -0,0 +1,9 @@
+plugins {
+    id 'my-java-library'
+}
+
+dependencies {
+    implementation 'org.apache.commons:commons-lang3'
+
+    api 'org.example.my-app:data-model'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle
new file mode 100644
index 0000000..488b88a
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id 'my-java-library'
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle b/24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle
new file mode 100644
index 0000000..cb68412
--- /dev/null
+++ b/24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle
@@ -0,0 +1,6 @@
+pluginManagement {
+    includeBuild '../my-build-logic'
+}
+plugins {
+    id 'my-project-structure'
+}
diff --git a/25_Using_Java_to_configure_builds/my-build-logic/java-plugins/build.gradle.kts b/25_Using_Java_to_configure_builds/my-build-logic/java-plugins/build.gradle
similarity index 100%
rename from 25_Using_Java_to_configure_builds/my-build-logic/java-plugins/build.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-build-logic/java-plugins/build.gradle
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle.kts b/25_Using_Java_to_configure_builds/my-build-logic/settings.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/settings.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-build-logic/settings.gradle
diff --git a/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/build.gradle.kts b/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/build.gradle
similarity index 100%
rename from 25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/build.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/build.gradle
diff --git a/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/src/main/java/myproject/gradle/MyProjectStructureSettingsPlugin.java b/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/src/main/java/myproject/gradle/MyProjectStructureSettingsPlugin.java
index 6e3cb66..f924918 100644
--- a/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/src/main/java/myproject/gradle/MyProjectStructureSettingsPlugin.java
+++ b/25_Using_Java_to_configure_builds/my-build-logic/structure-plugins/src/main/java/myproject/gradle/MyProjectStructureSettingsPlugin.java
@@ -22,13 +22,13 @@ public void apply(Settings settings) {
         // Location of other components
         dependencyResolutionManagement.getRepositories().mavenCentral();
         for (File folder: rootDir.getParentFile().listFiles()) {
-            if (new File(folder, "settings.gradle.kts").exists()) {
+            if (new File(folder, "settings.gradle").exists()) {
                 settings.includeBuild(folder.getPath());
             }
         }
 
         for (File folder: rootDir.listFiles()) {
-            if (new File(folder, "build.gradle.kts").exists()) {
+            if (new File(folder, "build.gradle").exists()) {
                 settings.include(folder.getName());
             }
         }
diff --git a/25_Using_Java_to_configure_builds/my-project/app/build.gradle.kts b/25_Using_Java_to_configure_builds/my-project/app/build.gradle
similarity index 100%
rename from 25_Using_Java_to_configure_builds/my-project/app/build.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-project/app/build.gradle
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle.kts b/25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-project/business-logic/build.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle
diff --git a/25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle.kts b/25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle.kts
deleted file mode 100644
index 87d9971..0000000
--- a/25_Using_Java_to_configure_builds/my-project/business-logic/build.gradle.kts
+++ /dev/null
@@ -1,9 +0,0 @@
-plugins {
-    id("my-java-library")
-}
-
-dependencies {
-    implementation("org.apache.commons:commons-lang3")
-
-    api("org.example.my-app:data-model")
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle.kts b/25_Using_Java_to_configure_builds/my-project/data-model/build.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-project/data-model/build.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-project/data-model/build.gradle
diff --git a/25_Using_Java_to_configure_builds/my-project/data-model/build.gradle.kts b/25_Using_Java_to_configure_builds/my-project/data-model/build.gradle.kts
deleted file mode 100644
index 2cdc125..0000000
--- a/25_Using_Java_to_configure_builds/my-project/data-model/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    id("my-java-library")
-}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle.kts b/25_Using_Java_to_configure_builds/my-project/settings.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-project/settings.gradle.kts
rename to 25_Using_Java_to_configure_builds/my-project/settings.gradle
diff --git a/25_Using_Java_to_configure_builds/my-project/settings.gradle.kts b/25_Using_Java_to_configure_builds/my-project/settings.gradle.kts
deleted file mode 100644
index e410bea..0000000
--- a/25_Using_Java_to_configure_builds/my-project/settings.gradle.kts
+++ /dev/null
@@ -1,6 +0,0 @@
-pluginManagement {
-    includeBuild("../my-build-logic")
-}
-plugins {
-    id("my-project-structure")
-}
diff --git a/26_The_Classpath/my-project/build.gradle.kts b/26_The_Classpath/my-project/build.gradle
similarity index 55%
rename from 26_The_Classpath/my-project/build.gradle.kts
rename to 26_The_Classpath/my-project/build.gradle
index bc018cd..d115493 100644
--- a/26_The_Classpath/my-project/build.gradle.kts
+++ b/26_The_Classpath/my-project/build.gradle
@@ -1,12 +1,12 @@
 repositories.mavenCentral()
 
-val implementation = configurations.create("implementation")
-val runtimeOnly = configurations.create("runtimeOnly")
-val compileClasspath = configurations.create("compileClasspath") {
-    extendsFrom(implementation)
+configurations.create("implementation")
+configurations.create("runtimeOnly")
+configurations.create("compileClasspath") {
+    extendsFrom(configurations.implementation)
 }
-val runtimeClasspath = configurations.create("runtimeClasspath") {
-    extendsFrom(implementation, runtimeOnly)
+configurations.create("runtimeClasspath") {
+    extendsFrom(configurations.implementation, configurations.runtimeOnly)
 }
 
 // Other classpath configurations we should have:
@@ -19,22 +19,22 @@ dependencies {
     runtimeOnly("org.slf4j:slf4j-simple:2.0.3")
 }
 
-val compileJava = tasks.register<JavaCompile>("compileJava") {
+def compileJava = tasks.register("compileJava", JavaCompile) {
     destinationDirectory.set(layout.buildDirectory.dir("classes"))
     source(layout.projectDirectory.dir("src"))
     sourceCompatibility = "11"
     targetCompatibility = "11"
-    classpath = files(compileClasspath)
+    classpath = files(configurations.compileClasspath)
 }
 
-tasks.register<JavaExec>("run") {
+tasks.register("run", JavaExec) {
     mainClass.set("mypackage.App")
-    classpath = files(compileJava, runtimeClasspath)
+    classpath = files(compileJava, configurations.runtimeClasspath)
 }
 
-tasks.register<Test>("test") {
+tasks.register("test", Test) {
     testClassesDirs = files(compileJava)
-    classpath = files(compileJava, runtimeClasspath)
+    classpath = files(compileJava, configurations.runtimeClasspath)
     binaryResultsDirectory.set(layout.buildDirectory.dir("test-results"))
     reports.junitXml.required.set(false)
     reports.html.required.set(false)
diff --git a/26_The_Classpath/my-project/settings.gradle.kts b/26_The_Classpath/my-project/settings.gradle
similarity index 100%
rename from 26_The_Classpath/my-project/settings.gradle.kts
rename to 26_The_Classpath/my-project/settings.gradle
diff --git a/27_Multiple_Compile_Classpaths/my-project/app/build.gradle.kts b/27_Multiple_Compile_Classpaths/my-project/app/build.gradle
similarity index 54%
rename from 27_Multiple_Compile_Classpaths/my-project/app/build.gradle.kts
rename to 27_Multiple_Compile_Classpaths/my-project/app/build.gradle
index c3b0440..d84732b 100644
--- a/27_Multiple_Compile_Classpaths/my-project/app/build.gradle.kts
+++ b/27_Multiple_Compile_Classpaths/my-project/app/build.gradle
@@ -1,15 +1,15 @@
-val implementation = configurations.create("implementation")
-val runtimeOnly = configurations.create("runtimeOnly")
-val compileClasspath = configurations.create("compileClasspath") {
-    extendsFrom(implementation)
+configurations.create("implementation")
+configurations.create("runtimeOnly")
+def compileClasspath = configurations.create("compileClasspath") {
+    extendsFrom(configurations.implementation)
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_API))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_API))
     }
 }
-val runtimeClasspath = configurations.create("runtimeClasspath") {
-    extendsFrom(implementation, runtimeOnly)
+def runtimeClasspath = configurations.create("runtimeClasspath") {
+    extendsFrom(configurations.implementation, configurations.runtimeOnly)
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_RUNTIME))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
     }
 }
 
@@ -19,7 +19,7 @@ dependencies {
     runtimeOnly("org.slf4j:slf4j-simple:2.0.3")
 }
 
-val compileJava = tasks.register<JavaCompile>("compileJava") {
+def compileJava = tasks.register("compileJava", JavaCompile) {
     destinationDirectory.set(layout.buildDirectory.dir("classes"))
     source(layout.projectDirectory.dir("src"))
     sourceCompatibility = "11"
@@ -30,7 +30,7 @@ val compileJava = tasks.register<JavaCompile>("compileJava") {
     }
 }
 
-tasks.register<JavaExec>("run") {
+tasks.register("run", JavaExec) {
     mainClass.set("mypackage.App")
     classpath = files(compileJava.flatMap { it.destinationDirectory }, runtimeClasspath)
     doLast {
diff --git a/27_Multiple_Compile_Classpaths/my-project/module/build.gradle.kts b/27_Multiple_Compile_Classpaths/my-project/module/build.gradle
similarity index 54%
rename from 27_Multiple_Compile_Classpaths/my-project/module/build.gradle.kts
rename to 27_Multiple_Compile_Classpaths/my-project/module/build.gradle
index 2106c9a..b12107f 100644
--- a/27_Multiple_Compile_Classpaths/my-project/module/build.gradle.kts
+++ b/27_Multiple_Compile_Classpaths/my-project/module/build.gradle
@@ -1,8 +1,8 @@
-val implementation = configurations.create("implementation")
-val api = configurations.create("api")
-val runtimeOnly = configurations.create("runtimeOnly")
-val compileClasspath = configurations.create("compileClasspath") {
-    extendsFrom(implementation, api)
+configurations.create("implementation")
+configurations.create("api")
+configurations.create("runtimeOnly")
+def compileClasspath = configurations.create("compileClasspath") {
+    extendsFrom(configurations.implementation, configurations.api)
 }
 
 dependencies {
@@ -10,7 +10,7 @@ dependencies {
     implementation("commons-io:commons-io:2.6")
 }
 
-val compileJava = tasks.register<JavaCompile>("compileJava") {
+def compileJava = tasks.register("compileJava", JavaCompile) {
     destinationDirectory.set(layout.buildDirectory.dir("classes"))
     source(layout.projectDirectory.dir("src"))
     sourceCompatibility = "11"
@@ -22,20 +22,20 @@ val compileJava = tasks.register<JavaCompile>("compileJava") {
 }
 
 configurations.create("apiElements") {
-    extendsFrom(api)
+    extendsFrom(configurations.api)
     outgoing {
         artifact(compileJava.flatMap { it.destinationDirectory })
     }
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_API))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_API))
     }
 }
 configurations.create("runtimeElements") {
-    extendsFrom(implementation, runtimeOnly,api)
+    extendsFrom(configurations.implementation, configurations.runtimeOnly, configurations.api)
     outgoing {
         artifact(compileJava.flatMap { it.destinationDirectory })
     }
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_RUNTIME))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
     }
 }
diff --git a/27_Multiple_Compile_Classpaths/my-project/settings.gradle.kts b/27_Multiple_Compile_Classpaths/my-project/settings.gradle
similarity index 100%
rename from 27_Multiple_Compile_Classpaths/my-project/settings.gradle.kts
rename to 27_Multiple_Compile_Classpaths/my-project/settings.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle
similarity index 78%
rename from 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle
index 3c766ac..3853081 100644
--- a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle.kts
+++ b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
new file mode 100644
index 0000000..45905aa
--- /dev/null
+++ b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -0,0 +1,51 @@
+import com.autonomousapps.AbstractPostProcessingTask
+import com.autonomousapps.DependencyAnalysisSubExtension
+import com.autonomousapps.model.Advice
+import com.autonomousapps.model.ProjectCoordinates
+
+plugins {
+    id("java")
+}
+
+group = "org.example.my-app"
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
+}
+
+def checkDependencyScopes = tasks.register("checkDependencyScopes", AbstractPostProcessingTask) {
+    group = LifecycleBasePlugin.VERIFICATION_GROUP
+    doLast {
+        def advices = projectAdvice().dependencyAdvice
+        if (!advices.isEmpty()) {
+            def toAdd = advices.findAll { it.toConfiguration != null &&
+                    it.toConfiguration != "runtimeOnly" }.collect {
+                declaration(it, it.toConfiguration) }.sort()
+            def toRemove = advices.findAll { it.fromConfiguration != null }.collect {
+                declaration(it, it.fromConfiguration) }.sort()
+
+            throw new RuntimeException("""
+                    ${projectAdvice().projectPath.substring(1)}/build.gradle
+                    
+                    Please add the following dependency declarations: 
+                        ${toAdd.join("\n                        ")}
+                    
+                    Please remove the following dependency declarations: 
+                        ${toRemove.join("\n                        ")}
+                """.stripIndent())
+        }
+    }
+}
+
+static declaration(Advice advice, String conf) {
+    if (advice.coordinates instanceof ProjectCoordinates) return "${conf}(project(\"${advice.coordinates.identifier}\"))"
+    return "${conf}(\"${advice.coordinates.identifier}\")"
+}
+
+extensions.findByType(DependencyAnalysisSubExtension)?.registerPostProcessingTask(
+        checkDependencyScopes)
+
+// Add checkDependencyScopes to 'check' lifecycle
+tasks.named("check") {
+    dependsOn(checkDependencyScopes)
+}
diff --git a/24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 24_Kotlin_DSL_and_Groovy_DSL/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-root.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-root.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-root.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/groovy/my-root.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
deleted file mode 100644
index 37a3503..0000000
--- a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ /dev/null
@@ -1,4 +0,0 @@
-plugins {
-    id("my-java-base")
-    id("application")
-}
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
deleted file mode 100644
index ab4b569..0000000
--- a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ /dev/null
@@ -1,50 +0,0 @@
-import com.autonomousapps.AbstractPostProcessingTask
-import com.autonomousapps.DependencyAnalysisSubExtension
-import com.autonomousapps.model.Advice
-import com.autonomousapps.model.ProjectCoordinates
-
-plugins {
-    id("java")
-}
-
-group = "org.example.my-app"
-
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
-
-val checkDependencyScopes = tasks.register<AbstractPostProcessingTask>("checkDependencyScopes") {
-    group = LifecycleBasePlugin.VERIFICATION_GROUP
-    doLast {
-        val advices = projectAdvice().dependencyAdvice
-        if (advices.isNotEmpty()) {
-            val toAdd = advices.filter { it.toConfiguration != null &&
-                    it.toConfiguration != "runtimeOnly" }.map {
-                it.declaration(it.toConfiguration) }.sorted()
-            val toRemove = advices.filter { it.fromConfiguration != null }.map {
-                it.declaration(it.fromConfiguration) }.sorted()
-
-            throw RuntimeException("""
-                    ${projectAdvice().projectPath.substring(1)}/build.gradle.kts
-                    
-                    Please add the following dependency declarations: 
-                        ${toAdd.joinToString("\n                        ")  { it }}
-                    
-                    Please remove the following dependency declarations: 
-                        ${toRemove.joinToString("\n                        ")  { it }}
-                """.trimIndent())
-        }
-    }
-}
-
-fun Advice.declaration(conf: String?) =
-        if (coordinates is ProjectCoordinates) "${conf}(project(\"${coordinates.identifier}\"))"
-        else "${conf}(\"${coordinates.identifier}\")"
-
-extensions.findByType<DependencyAnalysisSubExtension>()?.registerPostProcessingTask(
-        checkDependencyScopes)
-
-// Add checkDependencyScopes to 'check' lifecycle
-tasks.check {
-    dependsOn(checkDependencyScopes)
-}
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/settings.gradle.kts b/28_Dependency_Analysis_Plugin/my-build-logic/settings.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-build-logic/settings.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-build-logic/settings.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-project/app/build.gradle.kts b/28_Dependency_Analysis_Plugin/my-project/app/build.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-project/app/build.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-project/app/build.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-project/build.gradle.kts b/28_Dependency_Analysis_Plugin/my-project/build.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-project/build.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-project/build.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-project/module/build.gradle.kts b/28_Dependency_Analysis_Plugin/my-project/module/build.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-project/module/build.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-project/module/build.gradle
diff --git a/28_Dependency_Analysis_Plugin/my-project/settings.gradle.kts b/28_Dependency_Analysis_Plugin/my-project/settings.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-project/settings.gradle.kts
rename to 28_Dependency_Analysis_Plugin/my-project/settings.gradle
diff --git a/29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle.kts b/29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle
similarity index 86%
rename from 29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle.kts
rename to 29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle
index d3840bd..9027bea 100644
--- a/29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle.kts
+++ b/29_Classpath_Collisions/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 65%
rename from 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 110ba3c..f896752 100644
--- a/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -6,5 +6,5 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
diff --git a/28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 28_Dependency_Analysis_Plugin/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/29_Classpath_Collisions/my-build-logic/settings.gradle.kts b/29_Classpath_Collisions/my-build-logic/settings.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-build-logic/settings.gradle.kts
rename to 29_Classpath_Collisions/my-build-logic/settings.gradle
diff --git a/29_Classpath_Collisions/my-project/app/build.gradle.kts b/29_Classpath_Collisions/my-project/app/build.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-project/app/build.gradle.kts
rename to 29_Classpath_Collisions/my-project/app/build.gradle
diff --git a/29_Classpath_Collisions/my-project/module/build.gradle.kts b/29_Classpath_Collisions/my-project/module/build.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-project/module/build.gradle.kts
rename to 29_Classpath_Collisions/my-project/module/build.gradle
diff --git a/29_Classpath_Collisions/my-project/settings.gradle.kts b/29_Classpath_Collisions/my-project/settings.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-project/settings.gradle.kts
rename to 29_Classpath_Collisions/my-project/settings.gradle
diff --git a/30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle.kts b/30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle
similarity index 74%
rename from 30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle.kts
rename to 30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle
index 8ec7d15..03ecc92 100644
--- a/30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle.kts
+++ b/30_Security_Vulnerabilities/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 66%
rename from 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index de5be36..f5c4bdb 100644
--- a/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -5,7 +5,7 @@ plugins {
 }
 
 dependencyCheck {
-    scanConfigurations = listOf(configurations.runtimeClasspath.get().name)
+    scanConfigurations = [configurations.runtimeClasspath.name]
     autoUpdate = false
     // ...
 }
diff --git a/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 53%
rename from 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index 00f1201..ef70072 100644
--- a/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -5,22 +5,22 @@ plugins {
 group = "org.example.my-app"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 // Setup for consistent resolution with the application runtime classpath:
-val applicationRuntimeClasspath = configurations.create("applicationRuntimeClasspath") {
-    isCanBeConsumed = false
-    isCanBeResolved = true
+def applicationRuntimeClasspath = configurations.create("applicationRuntimeClasspath") {
+    canBeConsumed = false
+    canBeResolved = true
     attributes {
-        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage.JAVA_RUNTIME))
+        attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
     }
     withDependencies {
         add(project.dependencies.create(project(":app")))
     }
 }
 configurations.all {
-    if (this != applicationRuntimeClasspath && isCanBeResolved()) {
+    if (it != applicationRuntimeClasspath && it.canBeResolved) {
         shouldResolveConsistentlyWith(applicationRuntimeClasspath)
     }
 }
diff --git a/29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 29_Classpath_Collisions/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/30_Security_Vulnerabilities/my-build-logic/settings.gradle.kts b/30_Security_Vulnerabilities/my-build-logic/settings.gradle
similarity index 100%
rename from 30_Security_Vulnerabilities/my-build-logic/settings.gradle.kts
rename to 30_Security_Vulnerabilities/my-build-logic/settings.gradle
diff --git a/30_Security_Vulnerabilities/my-project/app/build.gradle.kts b/30_Security_Vulnerabilities/my-project/app/build.gradle
similarity index 100%
rename from 30_Security_Vulnerabilities/my-project/app/build.gradle.kts
rename to 30_Security_Vulnerabilities/my-project/app/build.gradle
diff --git a/30_Security_Vulnerabilities/my-project/module/build.gradle.kts b/30_Security_Vulnerabilities/my-project/module/build.gradle
similarity index 100%
rename from 30_Security_Vulnerabilities/my-project/module/build.gradle.kts
rename to 30_Security_Vulnerabilities/my-project/module/build.gradle
diff --git a/30_Security_Vulnerabilities/my-project/settings.gradle.kts b/30_Security_Vulnerabilities/my-project/settings.gradle
similarity index 100%
rename from 30_Security_Vulnerabilities/my-project/settings.gradle.kts
rename to 30_Security_Vulnerabilities/my-project/settings.gradle
diff --git a/31_The_Module_Path/my-build-logic/java-plugins/build.gradle.kts b/31_The_Module_Path/my-build-logic/java-plugins/build.gradle
similarity index 75%
rename from 31_The_Module_Path/my-build-logic/java-plugins/build.gradle.kts
rename to 31_The_Module_Path/my-build-logic/java-plugins/build.gradle
index 2725fdc..aa489c5 100644
--- a/31_The_Module_Path/my-build-logic/java-plugins/build.gradle.kts
+++ b/31_The_Module_Path/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 92%
rename from 31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index f1fa0d0..a31202d 100644
--- a/31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -14,7 +14,7 @@ javaModuleDependencies {
 group = "org.example"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies.constraints {
diff --git a/30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 30_Security_Vulnerabilities/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 31_The_Module_Path/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/31_The_Module_Path/my-build-logic/settings.gradle.kts b/31_The_Module_Path/my-build-logic/settings.gradle
similarity index 100%
rename from 31_The_Module_Path/my-build-logic/settings.gradle.kts
rename to 31_The_Module_Path/my-build-logic/settings.gradle
diff --git a/31_The_Module_Path/my-project/app/build.gradle.kts b/31_The_Module_Path/my-project/app/build.gradle
similarity index 100%
rename from 31_The_Module_Path/my-project/app/build.gradle.kts
rename to 31_The_Module_Path/my-project/app/build.gradle
diff --git a/31_The_Module_Path/my-project/modulea/build.gradle.kts b/31_The_Module_Path/my-project/modulea/build.gradle
similarity index 100%
rename from 31_The_Module_Path/my-project/modulea/build.gradle.kts
rename to 31_The_Module_Path/my-project/modulea/build.gradle
diff --git a/31_The_Module_Path/my-project/settings.gradle.kts b/31_The_Module_Path/my-project/settings.gradle
similarity index 100%
rename from 31_The_Module_Path/my-project/settings.gradle.kts
rename to 31_The_Module_Path/my-project/settings.gradle
diff --git a/32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle.kts b/32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle
similarity index 74%
rename from 32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle.kts
rename to 32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle
index d4c2165..a07ba8a 100644
--- a/32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle.kts
+++ b/32_Artifact_Transforms/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 79%
rename from 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index f520e81..ec7f55c 100644
--- a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -1,5 +1,5 @@
 import org.example.JavaModuleTransform
-import org.gradle.api.artifacts.type.ArtifactTypeDefinition.ARTIFACT_TYPE_ATTRIBUTE
+import static org.gradle.api.artifacts.type.ArtifactTypeDefinition.ARTIFACT_TYPE_ATTRIBUTE
 
 plugins {
     id("java")
@@ -17,7 +17,7 @@ plugins {
 //     }
 // }
 
-val javaModuleAttribute = Attribute.of("javaModule", Boolean::class.javaObjectType)
+def javaModuleAttribute = Attribute.of("javaModule", Boolean)
 configurations.compileClasspath {
     attributes.attribute(javaModuleAttribute, true)
 }
@@ -27,7 +27,7 @@ configurations.runtimeClasspath {
 
 dependencies.artifactTypes.maybeCreate("jar").attributes.attribute(javaModuleAttribute, false)
 
-dependencies.registerTransform(JavaModuleTransform::class) {
+dependencies.registerTransform(JavaModuleTransform) {
     from.attributes.attribute(ARTIFACT_TYPE_ATTRIBUTE, "jar").attribute(javaModuleAttribute, false)
     to.attributes.attribute(ARTIFACT_TYPE_ATTRIBUTE, "jar").attribute(javaModuleAttribute, true)
 }
@@ -36,7 +36,7 @@ dependencies.registerTransform(JavaModuleTransform::class) {
 group = "org.example"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
+    toolchain.languageVersion = JavaLanguageVersion.of(17)
 }
 
 dependencies.constraints {
diff --git a/31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 31_The_Module_Path/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/org/example/JavaModuleTransform.kt b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/org/example/JavaModuleTransform.groovy
similarity index 53%
rename from 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/org/example/JavaModuleTransform.kt
rename to 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/org/example/JavaModuleTransform.groovy
index c302db2..31bb1db 100644
--- a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/org/example/JavaModuleTransform.kt
+++ b/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/groovy/org/example/JavaModuleTransform.groovy
@@ -13,24 +13,26 @@ import java.util.jar.JarOutputStream
 import javax.inject.Inject
 
 // @CacheableTransform - if transform results should also be shared via remote build cache
-abstract class JavaModuleTransform : TransformAction<TransformParameters.None> {
+abstract class JavaModuleTransform implements TransformAction<TransformParameters.None> {
 
-    @get:InputArtifact
-    abstract val inputArtifact : Provider<FileSystemLocation>
+    @InputArtifact
+    abstract Provider<FileSystemLocation> getInputArtifact()
 
-    @get:Inject
-    abstract val archiveOperations : ArchiveOperations
+    @Inject
+    abstract ArchiveOperations getArchiveOperations()
 
-    override fun transform(outputs: TransformOutputs) {
-        val isModule = archiveOperations.zipTree(inputArtifact).any { it.name == "module-info.class" }
+    @Override
+    void transform(TransformOutputs outputs) {
+        def isModule = archiveOperations.zipTree(inputArtifact).any { it.name == "module-info.class" }
         if (isModule) {
             outputs.file(inputArtifact)
         } else {
-            val originalJar = inputArtifact.get().asFile
-            val target = outputs.file(originalJar.nameWithoutExtension + "-module.jar")
+            def originalJar = getInputArtifact().get().asFile
+            def originalJarName = originalJar.name.substring(0, originalJar.name.lastIndexOf('.'))
+            def target = outputs.file(originalJarName + "-module.jar")
 
-            JarInputStream(originalJar.inputStream()).use { input ->
-                JarOutputStream(target.outputStream(), input.manifest).use { output ->
+            new JarInputStream(new FileInputStream(originalJar)).withStream { input ->
+                new JarOutputStream(new FileOutputStream(target), input.manifest).withStream { output ->
                     var jarEntry = input.nextJarEntry
                     while (jarEntry != null) {
                         output.putNextEntry(jarEntry)
@@ -39,9 +41,9 @@ abstract class JavaModuleTransform : TransformAction<TransformParameters.None> {
                         jarEntry = input.nextJarEntry
                     }
 
-                    output.putNextEntry(JarEntry("module-info.class"))
-                    output.write(this::class.java.getResourceAsStream(
-                        "${originalJar.nameWithoutExtension}/module-info.class")!!.readAllBytes())
+                    output.putNextEntry(new JarEntry("module-info.class"))
+                    output.write(this.class.getResourceAsStream(
+                        "${originalJarName}/module-info.class").readAllBytes())
                     output.closeEntry()
                 }
             }
diff --git a/32_Artifact_Transforms/my-build-logic/settings.gradle.kts b/32_Artifact_Transforms/my-build-logic/settings.gradle
similarity index 100%
rename from 32_Artifact_Transforms/my-build-logic/settings.gradle.kts
rename to 32_Artifact_Transforms/my-build-logic/settings.gradle
diff --git a/32_Artifact_Transforms/my-project/app/build.gradle.kts b/32_Artifact_Transforms/my-project/app/build.gradle
similarity index 100%
rename from 32_Artifact_Transforms/my-project/app/build.gradle.kts
rename to 32_Artifact_Transforms/my-project/app/build.gradle
diff --git a/32_Artifact_Transforms/my-project/settings.gradle.kts b/32_Artifact_Transforms/my-project/settings.gradle
similarity index 100%
rename from 32_Artifact_Transforms/my-project/settings.gradle.kts
rename to 32_Artifact_Transforms/my-project/settings.gradle
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle
similarity index 89%
rename from 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle
index ac3ef45..1d82cc8 100644
--- a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle.kts
+++ b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-    `kotlin-dsl`
+    id("groovy-gradle-plugin")
 }
 
 dependencies {
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 100%
rename from 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
similarity index 94%
rename from 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
index d289082..8b94a75 100644
--- a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-base.gradle.kts
+++ b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-base.gradle
@@ -15,6 +15,6 @@ javaModuleTesting.whitebox(testing.suites.getByName("test")) {
     opensTo.add("org.junit.platform.commons")
 }
 
-tasks.test {
+tasks.named("test") {
     useJUnitPlatform() // JUnit5
 }
diff --git a/32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
similarity index 100%
rename from 32_Artifact_Transforms/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/groovy/my-java-library.gradle
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
deleted file mode 100644
index c4bbec4..0000000
--- a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/java-plugins/src/main/kotlin/my-java-library.gradle.kts
+++ /dev/null
@@ -1,4 +0,0 @@
-plugins {
-    id("my-java-base")
-    id("java-library")
-}
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-build-logic/settings.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-build-logic/settings.gradle
similarity index 100%
rename from 33_Classpath_and_Module_Path_in_Testing/my-build-logic/settings.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-build-logic/settings.gradle
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-project/app/build.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-project/app/build.gradle
similarity index 100%
rename from 33_Classpath_and_Module_Path_in_Testing/my-project/app/build.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-project/app/build.gradle
diff --git a/33_Classpath_and_Module_Path_in_Testing/my-project/settings.gradle.kts b/33_Classpath_and_Module_Path_in_Testing/my-project/settings.gradle
similarity index 100%
rename from 33_Classpath_and_Module_Path_in_Testing/my-project/settings.gradle.kts
rename to 33_Classpath_and_Module_Path_in_Testing/my-project/settings.gradle
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle b/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..849db8a
--- /dev/null
+++ b/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id('groovy-gradle-plugin')
+}
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle.kts b/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/34_Properties_and_Providers/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 56%
rename from 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index 74d7620..edc618d 100644
--- a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -6,25 +6,25 @@ plugins {
 
 tasks.named("assemble") // access existing task
 tasks.register("checkAll") // register new task
-tasks.withType<JavaCompile>().configureEach {  } // configure all of a certain type
+tasks.withType(JavaCompile).configureEach {  } // configure all of a certain type
 
 layout.projectDirectory
 layout.buildDirectory
 
-providers.environmentVariable("CI").orElse("false").get().toBoolean()
+providers.environmentVariable("CI").orElse("false").get().asBoolean()
 providers.gradleProperty("foo") // pass to build via -Pfoo=bar
 providers.systemProperty("file.encoding")
 
 version = providers.fileContents(layout.projectDirectory.file("version.txt"))
     .asText.get()
 
-val fileCollection: FileCollection = configurations.runtimeClasspath.get()
+FileCollection fileCollection  = configurations.runtimeClasspath
 fileCollection.elements.map { it.first().asFile }
 
 
-val main = application.mainClass.map { "$it-report.txt" }
+def main = application.mainClass.map { "$it-report.txt" }
 
-tasks.register<ApplicationReportTask>("applicationReport") {
-    classesDir.set(tasks.compileJava.flatMap { it.destinationDirectory })
+tasks.register("applicationReport", ApplicationReportTask) {
+    classesDir.set(tasks.named("compileJava").flatMap { it.destinationDirectory })
     reportFile.set(layout.buildDirectory.file(main))
 }
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/ApplicationReportTask.groovy b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/ApplicationReportTask.groovy
new file mode 100644
index 0000000..bc6e492
--- /dev/null
+++ b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/ApplicationReportTask.groovy
@@ -0,0 +1,36 @@
+package org.example
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.InputDirectory
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+abstract class ApplicationReportTask extends DefaultTask {
+
+    //abstract Property<String> getP1()
+    //abstract Property<Int> getP2()
+    //abstract Property<MyEnum> getP3()
+
+    //abstract SetProperty<String> getP4()
+    //abstract ListProperty<String> getP5()
+    //abstract MapProperty<String, String> getP6()
+
+    @InputDirectory
+    abstract DirectoryProperty getClassesDir()
+
+    @OutputFile
+    abstract RegularFileProperty getReportFile()
+
+    @TaskAction
+    void report() {
+        reportFile.get().asFile.text =
+        """
+            Application report:
+            ===================
+            Class File Count: ${classesDir.get().asFileTree.size()}
+        """.stripIndent().trim()
+    }
+
+}
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/MyEnum.kt b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/MyEnum.groovy
similarity index 52%
rename from 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/MyEnum.kt
rename to 34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/MyEnum.groovy
index 9262371..87556a9 100644
--- a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/MyEnum.kt
+++ b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/groovy/org/example/MyEnum.groovy
@@ -1,4 +1,4 @@
 package org.example
 
-enum class MyEnum {
+enum MyEnum {
 }
\ No newline at end of file
diff --git a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/ApplicationReportTask.kt b/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/ApplicationReportTask.kt
deleted file mode 100644
index e275e70..0000000
--- a/34_Properties_and_Providers/my-build-logic/java-plugins/src/main/kotlin/org/example/ApplicationReportTask.kt
+++ /dev/null
@@ -1,36 +0,0 @@
-package org.example
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.file.DirectoryProperty
-import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.tasks.InputDirectory
-import org.gradle.api.tasks.OutputFile
-import org.gradle.api.tasks.TaskAction
-
-abstract class ApplicationReportTask : DefaultTask() {
-
-    //abstract val p1: Property<String>
-    //abstract val p2: Property<Int>
-    //abstract val p3: Property<MyEnum>
-
-    //abstract val p4: SetProperty<String>
-    //abstract val p5: ListProperty<String>
-    //abstract val p6: MapProperty<String, String>
-
-    @get:InputDirectory
-    abstract val classesDir: DirectoryProperty
-
-    @get:OutputFile
-    abstract val reportFile: RegularFileProperty
-
-    @TaskAction
-    fun report() {
-        reportFile.get().asFile.writeText(
-        """
-            Application report:
-            ===================
-            Class File Count: ${classesDir.get().asFileTree.count()}
-        """.trimIndent())
-    }
-
-}
diff --git a/34_Properties_and_Providers/my-build-logic/settings.gradle.kts b/34_Properties_and_Providers/my-build-logic/settings.gradle
similarity index 100%
rename from 34_Properties_and_Providers/my-build-logic/settings.gradle.kts
rename to 34_Properties_and_Providers/my-build-logic/settings.gradle
diff --git a/34_Properties_and_Providers/my-project/app/build.gradle.kts b/34_Properties_and_Providers/my-project/app/build.gradle
similarity index 100%
rename from 34_Properties_and_Providers/my-project/app/build.gradle.kts
rename to 34_Properties_and_Providers/my-project/app/build.gradle
diff --git a/34_Properties_and_Providers/my-project/settings.gradle.kts b/34_Properties_and_Providers/my-project/settings.gradle
similarity index 100%
rename from 34_Properties_and_Providers/my-project/settings.gradle.kts
rename to 34_Properties_and_Providers/my-project/settings.gradle
diff --git a/35_Working_with_Files/my-build-logic/java-plugins/build.gradle b/35_Working_with_Files/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/35_Working_with_Files/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/35_Working_with_Files/my-build-logic/java-plugins/build.gradle.kts b/35_Working_with_Files/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/35_Working_with_Files/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 68%
rename from 35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index 6863e35..61c70cf 100644
--- a/35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -4,16 +4,16 @@ plugins {
     id("java")
 }
 
-val generateStartScript = tasks.register<GenerateStartScript>("generateStartScript") {
+def generateStartScript = tasks.register("generateStartScript", GenerateStartScript) {
     mainClass = "org.example.app.App"
     scriptFile = layout.buildDirectory.file("tmp/scripts/run")
 }
 
-val installSpec = copySpec {
+def installSpec = copySpec {
     from(generateStartScript)
 
     into("app") {
-        from(tasks.jar)
+        from(tasks.named("jar"))
     }
     into("libs") {
         from(configurations.runtimeClasspath) {
@@ -22,13 +22,13 @@ val installSpec = copySpec {
                 it.substring(0, it.lastIndexOf("-")) + ".jar"
             }
         }
-        // from(configurations.runtimeClasspath.get().elements.map { it.map { jar -> zipTree(jar) } }) {
+        // from(configurations.runtimeClasspath.elements.map { it.collect { jar -> zipTree(jar) } }) {
         //     exclude("META-INF/**")
         // }
     }
 }
 
-val packageSpec = copySpec {
+def packageSpec = copySpec {
     with(installSpec)
 
     into("meta") {
@@ -36,17 +36,17 @@ val packageSpec = copySpec {
     }
 }
 
-tasks.register<Sync>("install") { // in special cases: <Copy> as alternative
+tasks.register("install", Sync) { // in special cases: <Copy> as alternative
     with(installSpec)
     destinationDir = layout.buildDirectory.dir("install").get().asFile
 }
 
-tasks.register<Zip>("package") {
+tasks.register("package", Zip) {
     with(packageSpec)
     destinationDirectory = layout.buildDirectory.dir("dist")
 }
 
-tasks.build {
+tasks.named("build") {
     dependsOn(tasks.named("install"))
     dependsOn(tasks.named("package"))
 }
diff --git a/35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/org/example/GenerateStartScript.groovy b/35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/org/example/GenerateStartScript.groovy
new file mode 100644
index 0000000..a2efa28
--- /dev/null
+++ b/35_Working_with_Files/my-build-logic/java-plugins/src/main/groovy/org/example/GenerateStartScript.groovy
@@ -0,0 +1,43 @@
+package org.example
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.CacheableTask
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+
+import java.nio.file.Files
+import static java.nio.file.attribute.PosixFilePermission.*
+
+@CacheableTask
+abstract class GenerateStartScript extends DefaultTask {
+
+    @Input
+    abstract Property<String> getMainClass()
+
+    @OutputFile
+    abstract RegularFileProperty getScriptFile()
+
+    // @Inject
+    // abstract FileOperations getFiles()
+
+    @TaskAction
+    def generate() {
+        def main = mainClass.get() // String
+        def out = scriptFile.get().asFile // java.io.File
+        def script = "java -cp 'libs/*:app/*' $main"
+
+        out.text = script
+        Files.setPosixFilePermissions(out.toPath(), [
+                OWNER_READ, OWNER_WRITE, OWNER_EXECUTE,
+                GROUP_READ, GROUP_EXECUTE,
+                OTHERS_EXECUTE, OTHERS_READ
+        ] as Set)
+
+        // files.sync {
+        //     ...
+        // }
+    }
+}
\ No newline at end of file
diff --git a/35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/org/example/GenerateStartScript.kt b/35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/org/example/GenerateStartScript.kt
deleted file mode 100644
index c66a378..0000000
--- a/35_Working_with_Files/my-build-logic/java-plugins/src/main/kotlin/org/example/GenerateStartScript.kt
+++ /dev/null
@@ -1,44 +0,0 @@
-package org.example;
-
-import org.gradle.api.DefaultTask
-import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.internal.file.FileOperations
-import org.gradle.api.provider.Property
-import org.gradle.api.tasks.CacheableTask
-import org.gradle.api.tasks.Input
-import org.gradle.api.tasks.OutputFile
-import org.gradle.api.tasks.TaskAction
-import java.nio.file.Files
-import java.nio.file.attribute.PosixFilePermission.*
-import javax.inject.Inject
-
-@CacheableTask
-abstract class GenerateStartScript : DefaultTask() {
-
-    @get:Input
-    abstract val mainClass: Property<String>
-
-    @get:OutputFile
-    abstract val scriptFile: RegularFileProperty
-
-    // @get:Inject
-    // abstract val files: FileOperations
-
-    @TaskAction
-    fun generate() {
-        val main = mainClass.get() // String
-        val out = scriptFile.get().asFile // java.io.File
-        val script = "java -cp 'libs/*:app/*' $main"
-
-        out.writeText(script)
-        Files.setPosixFilePermissions(out.toPath(), setOf(
-            OWNER_READ, OWNER_WRITE, OWNER_EXECUTE,
-            GROUP_READ, GROUP_EXECUTE,
-            OTHERS_EXECUTE, OTHERS_READ
-        ))
-
-        // files.sync {
-        //     ...
-        // }
-    }
-}
\ No newline at end of file
diff --git a/35_Working_with_Files/my-build-logic/settings.gradle.kts b/35_Working_with_Files/my-build-logic/settings.gradle
similarity index 100%
rename from 35_Working_with_Files/my-build-logic/settings.gradle.kts
rename to 35_Working_with_Files/my-build-logic/settings.gradle
diff --git a/35_Working_with_Files/my-project/app/build.gradle.kts b/35_Working_with_Files/my-project/app/build.gradle
similarity index 100%
rename from 35_Working_with_Files/my-project/app/build.gradle.kts
rename to 35_Working_with_Files/my-project/app/build.gradle
diff --git a/35_Working_with_Files/my-project/settings.gradle.kts b/35_Working_with_Files/my-project/settings.gradle
similarity index 100%
rename from 35_Working_with_Files/my-project/settings.gradle.kts
rename to 35_Working_with_Files/my-project/settings.gradle
diff --git a/36_Task_Actions/my-build-logic/java-plugins/build.gradle b/36_Task_Actions/my-build-logic/java-plugins/build.gradle
new file mode 100644
index 0000000..fbd5c69
--- /dev/null
+++ b/36_Task_Actions/my-build-logic/java-plugins/build.gradle
@@ -0,0 +1,3 @@
+plugins {
+    id("groovy-gradle-plugin")
+}
diff --git a/36_Task_Actions/my-build-logic/java-plugins/build.gradle.kts b/36_Task_Actions/my-build-logic/java-plugins/build.gradle.kts
deleted file mode 100644
index bc0172f..0000000
--- a/36_Task_Actions/my-build-logic/java-plugins/build.gradle.kts
+++ /dev/null
@@ -1,3 +0,0 @@
-plugins {
-    `kotlin-dsl`
-}
diff --git a/36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/PrintVersion.kt b/36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/PrintVersion.groovy
similarity index 64%
rename from 36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/PrintVersion.kt
rename to 36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/PrintVersion.groovy
index 8db2d2a..8a8af0f 100644
--- a/36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/PrintVersion.kt
+++ b/36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/PrintVersion.groovy
@@ -3,13 +3,13 @@ import org.gradle.api.provider.Property
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.TaskAction
 
-abstract class PrintVersion : DefaultTask() {
+abstract class PrintVersion extends DefaultTask {
 
-    @get:Input
-    abstract val version: Property<String>
+    @Input
+    abstract Property<String> getVersion()
 
     @TaskAction
-    fun print() {
+    void print() {
         println("Version: ${version.get()}")
     }
 }
diff --git a/36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts b/36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
similarity index 88%
rename from 36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
rename to 36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
index cf541e5..c1f1f5c 100644
--- a/36_Task_Actions/my-build-logic/java-plugins/src/main/kotlin/my-java-application.gradle.kts
+++ b/36_Task_Actions/my-build-logic/java-plugins/src/main/groovy/my-java-application.gradle
@@ -2,20 +2,19 @@ plugins {
     id("application")
 }
 
-tasks.compileJava {
+tasks.named("compileJava") {
     actions.clear() // Remove compile action from JavaCompile task
     doFirst {
         println("Number of task actions: " + actions.size)
     }
     doLast {
-        this as JavaCompile
         Runtime.getRuntime().exec( // Add our own 'java compile' implementation
             "javac ${source.asPath} -d ${destinationDirectory.get().asFile}").waitFor()
         println("Compilation finished: ${inputs.sourceFiles.asPath}")
     }
 }
 
-tasks.register<PrintVersion>("printVersion") {
+tasks.register("printVersion", PrintVersion) {
     version = project.version as String
 }
 
diff --git a/36_Task_Actions/my-build-logic/settings.gradle.kts b/36_Task_Actions/my-build-logic/settings.gradle
similarity index 100%
rename from 36_Task_Actions/my-build-logic/settings.gradle.kts
rename to 36_Task_Actions/my-build-logic/settings.gradle
diff --git a/36_Task_Actions/my-project/app/build.gradle.kts b/36_Task_Actions/my-project/app/build.gradle
similarity index 100%
rename from 36_Task_Actions/my-project/app/build.gradle.kts
rename to 36_Task_Actions/my-project/app/build.gradle
diff --git a/36_Task_Actions/my-project/settings.gradle.kts b/36_Task_Actions/my-project/settings.gradle
similarity index 100%
rename from 36_Task_Actions/my-project/settings.gradle.kts
rename to 36_Task_Actions/my-project/settings.gradle