Fix Java 11 Example PreCommit GItHub Action

.github/workflows/beam_PreCommit_Java_Examples_Dataflow_Java11.yml

@@ -100,6 +100,8 @@ jobs:
           service_account_key: ${{ secrets.GCP_SA_KEY }}
           project_id: ${{ secrets.GCP_PROJECT_ID }}
           export_default_credentials: true
+      # The workflow installs java 11 and as default jvm. This is different from
+      # PreCommit_Java_Examples_Dataflow_Java17 where the build system and sources are compiled with Java8
       - name: Set up Java
         uses: actions/[email protected]
         with:

buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy

@@ -18,23 +18,24 @@
 
 package org.apache.beam.gradle
 
+import static java.util.UUID.randomUUID
+
 import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import groovy.json.JsonOutput
 import groovy.json.JsonSlurper
+import java.net.ServerSocket
+import java.util.logging.Logger
 import org.gradle.api.attributes.Category
 import org.gradle.api.GradleException
 import org.gradle.api.JavaVersion
 import org.gradle.api.Plugin
 import org.gradle.api.Project
-import org.gradle.api.Task
 import org.gradle.api.artifacts.Configuration
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.file.FileCollection
 import org.gradle.api.file.FileTree
-import org.gradle.api.plugins.quality.Checkstyle
 import org.gradle.api.publish.maven.MavenPublication
 import org.gradle.api.tasks.Copy
-import org.gradle.api.tasks.Delete
 import org.gradle.api.tasks.Exec
 import org.gradle.api.tasks.JavaExec
 import org.gradle.api.tasks.TaskProvider
@@ -43,13 +44,10 @@ import org.gradle.api.tasks.compile.CompileOptions
 import org.gradle.api.tasks.compile.JavaCompile
 import org.gradle.api.tasks.javadoc.Javadoc
 import org.gradle.api.tasks.testing.Test
-import org.gradle.api.tasks.PathSensitive
 import org.gradle.api.tasks.PathSensitivity
 import org.gradle.testing.jacoco.tasks.JacocoReport
 
-import java.net.ServerSocket
 
-import static java.util.UUID.randomUUID
 /**
  * This plugin adds methods to configure a module with Beam's defaults, called "natures".
  *
@@ -67,6 +65,8 @@ import static java.util.UUID.randomUUID
  */
 class BeamModulePlugin implements Plugin<Project> {
 
+  static final Logger logger = Logger.getLogger(BeamModulePlugin.class.getName())
+
   /** Licence header enforced by spotless */
   static final String javaLicenseHeader = """/*
  * Licensed to the Apache Software Foundation (ASF) under one
@@ -451,6 +451,38 @@ class BeamModulePlugin implements Plugin<Project> {
     return 'beam' + p.path.replace(':', '-')
   }
 
+  /*
+   * Set compile args for compiling and running in different java version by modifying the compiler args in place.
+   *
+   * Replace `-source X` and `-target X` or `--release X` options if already existed in compilerArgs.
+   */
+  static def setCompileAndRuntimeJavaVersion(List<String> compilerArgs, String ver) {
+    boolean foundS = false, foundT = false
+    int foundR = -1
+    logger.fine("set java ver ${ver} to compiler args")
+    for (int i = 0; i < compilerArgs.size()-1; ++i) {
+      if (compilerArgs.get(i) == '-source') {
+        foundS = true
+        compilerArgs.set(i+1, ver)
+      } else if (compilerArgs.get(i) == '-target')  {
+        foundT = true
+        compilerArgs.set(i+1, ver)
+      } else if (compilerArgs.get(i) == '--release') {
+        foundR = i
+      }
+    }
+    if (foundR != -1) {
+      compilerArgs.removeAt(foundR + 1)
+      compilerArgs.removeAt(foundR)
+    }
+    if (!foundS) {
+      compilerArgs.addAll('-source', ver)
+    }
+    if (!foundT) {
+      compilerArgs.addAll('-target', ver)
+    }
+  }
+
   void apply(Project project) {
 
     /** ***********************************************************************************************/
@@ -1055,13 +1087,12 @@ class BeamModulePlugin implements Plugin<Project> {
         options.encoding = "UTF-8"
         // Use -source 8 -target 8 when targeting Java 8 and running on JDK > 8
         //
-        // Consider migrating compilation and testing to use JDK 9+ and setting '-source 8 -target 8' as
+        // Consider migrating compilation and testing to use JDK 9+ and setting '--release 8' as
         // the default allowing 'applyJavaNature' to override it for the few modules that need JDK 9+
         // artifacts. See https://stackoverflow.com/a/43103038/4368200 for additional details.
         if (JavaVersion.VERSION_1_8.compareTo(JavaVersion.toVersion(project.javaVersion)) == 0
         && JavaVersion.VERSION_1_8.compareTo(JavaVersion.current()) < 0) {
-          options.compilerArgs += ['-source', '8']
-          options.compilerArgs += ['-target', '8']
+          options.compilerArgs += ['--release', '8']
           // TODO(https://github.com/apache/beam/issues/23901): Fix
           // optimizerOuterThis breakage
           options.compilerArgs += ['-XDoptimizeOuterThis=false']
@@ -1083,21 +1114,6 @@ class BeamModulePlugin implements Plugin<Project> {
         preserveFileTimestamps(false)
       }
 
-      if (project.hasProperty("compileAndRunTestsWithJava11")) {
-        def java11Home = project.findProperty("java11Home")
-        project.tasks.compileTestJava {
-          options.fork = true
-          options.forkOptions.javaHome = java11Home as File
-          options.compilerArgs += ['-Xlint:-path']
-          options.compilerArgs += ['-source', '11']
-          options.compilerArgs += ['-target', '11']
-        }
-        project.tasks.withType(Test) {
-          useJUnit()
-          executable = "${java11Home}/bin/java"
-        }
-      }
-
       // Configure the default test tasks set of tests executed
       // to match the equivalent set that is executed by the maven-surefire-plugin.
       // See http://maven.apache.org/components/surefire/maven-surefire-plugin/test-mojo.html
@@ -1234,8 +1250,6 @@ class BeamModulePlugin implements Plugin<Project> {
         }
       }
 
-
-
       if (configuration.shadowClosure) {
         // Ensure that tests are packaged and part of the artifact set.
         project.task('packageTests', type: Jar) {
@@ -1487,18 +1501,30 @@ class BeamModulePlugin implements Plugin<Project> {
         options.errorprone.errorproneArgs.add("-Xep:Slf4jLoggerShouldBeNonStatic:OFF")
       }
 
-      if (project.hasProperty("compileAndRunTestsWithJava17")) {
+      if (project.hasProperty("compileAndRunTestsWithJava11")) {
+        def java11Home = project.findProperty("java11Home")
+        project.tasks.compileTestJava {
+          options.fork = true
+          options.forkOptions.javaHome = java11Home as File
+          options.compilerArgs += ['-Xlint:-path']
+          setCompileAndRuntimeJavaVersion(options.compilerArgs, '11')
+        }
+        project.tasks.withType(Test).configureEach {
+          useJUnit()
+          executable = "${java11Home}/bin/java"
+        }
+      } else if (project.hasProperty("compileAndRunTestsWithJava17")) {
         def java17Home = project.findProperty("java17Home")
         project.tasks.compileTestJava {
-          options.compilerArgs += ['-target', '17']
-          options.compilerArgs += ['-source', '17']
+          setCompileAndRuntimeJavaVersion(options.compilerArgs, '17')
           project.ext.setJava17Options(options)
         }
-        project.tasks.withType(Test) {
+        project.tasks.withType(Test).configureEach {
           useJUnit()
           executable = "${java17Home}/bin/java"
         }
       }
+
       if (configuration.shadowClosure) {
         // Enables a plugin which can perform shading of classes. See the general comments
         // above about dependency management for Java projects and how the shadow plugin