19. Java 17 transition

Overview

Background Material

https://mydeveloperplanet.com/2021/09/28/whats-new-between-java-11-and-java-17/

Preparing for the Transition

• Upgrade to the latest Maven version https://github.com/iluwatar/java-design-patterns/issues/1948
• Update Maven plugins such as compile, surefire and failsafe to newer versions so that they support Java 17
• Update Lombok to the latest version that supports Java 17 (see https://projectlombok.org/changelog)
• Get rid of current compiler warnings, especially the ones that warn about deprecation
• Run the regular build entirely on the newer JDK in a way that lets us gather all errors instead of stopping the build to the first failure
• Build the project using the old JDK, but try to run it against a newer runtime and record the errors
• Upgrade dependencies so that they support Java 17

Switch from JDK11 to JDK17

• Configure Maven plugins to use Java 17 and verify that build works using JDK17
• Update CI configuration to use JDK17

After the Transition

• Update wiki documentation
• Start using text blocks
• Update switch expressions
• Start using records
• Start using sealed classes
• Pattern matching for instanceof
• Stream.toList()