Convert spring-core tests from groovy to java (#8166)

Related to #7195.

Converts spring core instrumentation tests from groovy to java.

---------

Co-authored-by: Mateusz Rzeszutek <[email protected]>

instrumentation/spring/spring-core-2.0/javaagent/build.gradle.kts

@@ -19,3 +19,10 @@ dependencies {
   // 4.0 introduces submitListenable() methods
   testLibrary("org.springframework:spring-core:4.0.0.RELEASE")
 }
+
+// spring 6 requires java 17
+if (findProperty("testLatestDeps") as Boolean) {
+  otelJava {
+    minJavaVersionSupported.set(JavaVersion.VERSION_17)
+  }
+}

instrumentation/spring/spring-core-2.0/javaagent/src/test/java/SimpleAsyncTaskExecutorInstrumentationTest.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import io.opentelemetry.api.GlobalOpenTelemetry;
+import io.opentelemetry.api.trace.SpanKind;
+import io.opentelemetry.api.trace.Tracer;
+import io.opentelemetry.instrumentation.testing.junit.AgentInstrumentationExtension;
+import io.opentelemetry.instrumentation.testing.junit.InstrumentationExtension;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.junit.jupiter.api.function.ThrowingConsumer;
+import org.springframework.core.task.SimpleAsyncTaskExecutor;
+
+public class SimpleAsyncTaskExecutorInstrumentationTest {
+
+  @RegisterExtension
+  private static final InstrumentationExtension testing = AgentInstrumentationExtension.create();
+
+  private static final SimpleAsyncTaskExecutor EXECUTOR = new SimpleAsyncTaskExecutor();
+
+  @Test
+  void executeRunnable() {
+    executeTwoTasks(EXECUTOR::execute);
+  }
+
+  @Test
+  void submitRunnable() {
+    executeTwoTasks(task -> EXECUTOR.submit((Runnable) task));
+  }
+
+  @Test
+  void submitCallable() {
+    executeTwoTasks(task -> EXECUTOR.submit((Callable<?>) task));
+  }
+
+  @Test
+  void submitListenableRunnable() {
+    executeTwoTasks(task -> EXECUTOR.submitListenable((Runnable) task));
+  }
+
+  @Test
+  void submitListenableCallable() {
+    executeTwoTasks(task -> EXECUTOR.submitListenable((Callable<?>) task));
+  }
+
+  private static void executeTwoTasks(ThrowingConsumer<AsyncTask> task) {
+    testing.runWithSpan(
+        "parent",
+        () -> {
+          AsyncTask child1 = new AsyncTask(true);
+          AsyncTask child2 = new AsyncTask(false);
+          try {
+            task.accept(child1);
+            task.accept(child2);
+          } catch (Throwable throwable) {
+            throw new AssertionError(throwable);
+          }
+          child1.waitForCompletion();
+          child2.waitForCompletion();
+        });
+    testing.waitAndAssertTraces(
+        trace ->
+            trace
+                .hasSize(2)
+                .hasSpansSatisfyingExactly(
+                    span -> span.hasName("parent").hasKind(SpanKind.INTERNAL).hasNoParent(),
+                    span ->
+                        span.hasName("asyncChild")
+                            .hasKind(SpanKind.INTERNAL)
+                            .hasParent(trace.getSpan(0))));
+  }
+
+  static class AsyncTask implements Runnable, Callable<Object> {
+
+    private static final Tracer TRACER = GlobalOpenTelemetry.getTracer("test");
+
+    private final boolean startSpan;
+    private final CountDownLatch latch = new CountDownLatch(1);
+
+    public AsyncTask(boolean startSpan) {
+      this.startSpan = startSpan;
+    }
+
+    @Override
+    public void run() {
+      if (startSpan) {
+        TRACER.spanBuilder("asyncChild").startSpan().end();
+      }
+      latch.countDown();
+    }
+
+    @Override
+    public Object call() {
+      run();
+      return null;
+    }
+
+    void waitForCompletion() {
+      try {
+        latch.await();
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        throw new AssertionError(e);
+      }
+    }
+  }
+}