Fix for Kotlin 1.7 breaking changes

src/main/java/org/javamodularity/moduleplugin/tasks/CompileJavaTaskMutator.java

@@ -4,12 +4,12 @@
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.logging.Logger;
 import org.gradle.api.logging.Logging;
-import org.gradle.api.tasks.compile.AbstractCompile;
 import org.gradle.api.tasks.compile.JavaCompile;
 import org.javamodularity.moduleplugin.JavaProjectHelper;
 import org.javamodularity.moduleplugin.extensions.CompileModuleOptions;
 import org.javamodularity.moduleplugin.extensions.PatchModuleContainer;
 import org.javamodularity.moduleplugin.internal.MutatorHelper;
+import org.javamodularity.moduleplugin.tasks.MergeClassesHelper.CompileTaskWrapper;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -60,7 +60,7 @@ private List<String> buildCompilerArgs(JavaCompile javaCompile) {
                 helper().modularityExtension().optionContainer().getPatchModuleContainer());
         String moduleName = helper().moduleName();
         new MergeClassesHelper(project).otherCompileTaskStream()
-                .map(AbstractCompile::getDestinationDir)
+                .map(CompileTaskWrapper::getDestinationDir)
                 .forEach(dir -> patchModuleContainer.addDir(moduleName, dir.getAbsolutePath()));
 
         // Keep only valid module-path entries (https://github.com/java9-modularity/gradle-modules-plugin/issues/190)

src/main/java/org/javamodularity/moduleplugin/tasks/MergeClassesHelper.java

@@ -1,6 +1,8 @@
 package org.javamodularity.moduleplugin.tasks;
 
 import org.gradle.api.Project;
+import org.gradle.api.Task;
+import org.gradle.api.file.DirectoryProperty;
 import org.gradle.api.file.DuplicatesStrategy;
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.logging.Logger;
@@ -15,10 +17,13 @@
 import org.javamodularity.moduleplugin.internal.StreamHelper;
 
 import java.io.File;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
+import java.util.function.Supplier;
 import java.util.stream.Stream;
 
 public class MergeClassesHelper {
@@ -38,10 +43,11 @@ public Project project() {
         return project;
     }
 
-    public Stream<AbstractCompile> otherCompileTaskStream() {
+    public Stream<CompileTaskWrapper> otherCompileTaskStream() {
         return otherCompileTaskNameStream()
-                .map(name -> helper().findTask(name, AbstractCompile.class))
-                .flatMap(Optional::stream);
+                .map(name -> helper().findTask(name, Task.class))
+                .flatMap(Optional::stream)
+                .map(this::toWrapper);
     }
 
     private Stream<String> otherCompileTaskNameStream() {
@@ -52,16 +58,16 @@ private Stream<String> otherCompileTaskNameStream() {
         );
     }
 
-    public JavaCompile javaCompileTask() {
-        return helper().task(JavaPlugin.COMPILE_JAVA_TASK_NAME, JavaCompile.class);
+    private CompileTaskWrapper javaCompileTask() {
+        return toWrapper(helper().task(JavaPlugin.COMPILE_JAVA_TASK_NAME, JavaCompile.class));
     }
 
-    public Stream<AbstractCompile> allCompileTaskStream() {
+    public Stream<CompileTaskWrapper> allCompileTaskStream() {
         return Stream.concat(Stream.of(javaCompileTask()), otherCompileTaskStream());
     }
 
     public boolean isMergeRequired() {
-        return otherCompileTaskStream().anyMatch(task -> !task.getSource().isEmpty());
+        return otherCompileTaskStream().anyMatch(CompileTaskWrapper::hasSource);
     }
 
     public Sync createMergeClassesTask() {
@@ -84,12 +90,112 @@ public FileCollection getMergeAdjustedClasspath(FileCollection classpath) {
         }
 
         Set<File> files = new HashSet<>(classpath.getFiles());
-        allCompileTaskStream().map(AbstractCompile::getDestinationDir).forEach(files::remove);
+        allCompileTaskStream().map(CompileTaskWrapper::getDestinationDir).forEach(files::remove);
         files.add(helper().getMergedDir());
         return project.files(files.toArray());
     }
 
+    private CompileTaskWrapper toWrapper(Task task) {
+        return task instanceof AbstractCompile
+            ? new GradleTaskWrapper((AbstractCompile) task)
+            : new ReflectionTaskWrapper(task);
+    }
+
     private JavaProjectHelper helper() {
         return new JavaProjectHelper(project);
     }
+
+    public interface CompileTaskWrapper {
+        Task getTask();
+
+        File getDestinationDir();
+
+        boolean hasSource();
+    }
+
+    private static final class GradleTaskWrapper implements CompileTaskWrapper {
+
+        private final AbstractCompile task;
+
+        GradleTaskWrapper(AbstractCompile task) {
+            this.task = task;
+        }
+
+        @Override
+        public Task getTask() {
+            return task;
+        }
+
+        @Override
+        public File getDestinationDir() {
+            return task.getDestinationDir();
+        }
+
+        @Override
+        public boolean hasSource() {
+            return !task.getSource().isEmpty();
+        }
+    }
+
+    private static final class ReflectionTaskWrapper implements CompileTaskWrapper {
+
+        private final Task task;
+        private final Supplier<DirectoryProperty> destinationDir;
+        private final Supplier<FileCollection> source;
+
+        ReflectionTaskWrapper(Task task) {
+            this.task = task;
+            this.destinationDir = supplier(
+                    task,
+                    "getDestinationDirectory",
+                    DirectoryProperty.class
+            );
+            this.source = supplier(
+                    task,
+                    "getSources",
+                    FileCollection.class
+            );
+        }
+
+        @Override
+        public Task getTask() {
+            return task;
+        }
+
+        @Override
+        public File getDestinationDir() {
+            return destinationDir.get().getAsFile().getOrNull();
+        }
+
+        @Override
+        public boolean hasSource() {
+            return !source.get().isEmpty();
+        }
+
+        private static <T> Supplier<T> supplier(Task task, String getterName, Class<T> getterReturnType) {
+            final Method m = getMethod(task, getterName);
+
+            return () -> {
+                try {
+                    final Object result = m.invoke(task);
+                    return getterReturnType.cast(result);
+                } catch (InvocationTargetException e) {
+                    if (e.getTargetException() instanceof RuntimeException) {
+                        throw (RuntimeException) e.getTargetException();
+                    }
+                    throw new RuntimeException(e.getTargetException());
+                } catch (IllegalAccessException e) {
+                    throw new RuntimeException("Failed to invoke " + getterName + " on " + task.getClass(), e);
+                }
+            };
+        }
+
+        private static Method getMethod(Task task, String name) {
+            try {
+                return task.getClass().getMethod(name);
+            } catch (NoSuchMethodException e) {
+                throw new IllegalStateException("Method " + name + " missing on " + task.getClass(), e);
+            }
+        }
+    }
 }

src/main/java/org/javamodularity/moduleplugin/tasks/MergeClassesTask.java

@@ -26,14 +26,14 @@ public void configureMergeClasses() {
     public void configureMergeClassesAfterEvaluate() {
         var mergeClasses = mergeClassesHelper().createMergeClassesTask();
 
-        mergeClassesHelper().allCompileTaskStream().forEach(task -> {
+        mergeClassesHelper().allCompileTaskStream().forEach(taskWrapper -> {
             List<String> modularTasks = List.of(JavaPlugin.COMPILE_JAVA_TASK_NAME, CompileModuleOptions.COMPILE_MODULE_INFO_TASK_NAME);
-            if(modularTasks.contains(task.getName())) {
-                mergeClasses.from(task.getDestinationDir());
+            if(modularTasks.contains(taskWrapper.getTask().getName())) {
+                mergeClasses.from(taskWrapper.getDestinationDir());
             } else {
-                mergeClasses.from(task.getDestinationDir(), copySpec -> copySpec.exclude("**/module-info.class"));
+                mergeClasses.from(taskWrapper.getDestinationDir(), copySpec -> copySpec.exclude("**/module-info.class"));
             }
-            mergeClasses.dependsOn(task);
+            mergeClasses.dependsOn(taskWrapper.getTask());
         });
         mergeClasses.into(helper().getMergedDir());
         mergeClasses.onlyIf(task -> mergeClassesHelper().isMergeRequired());

src/test/java/org/javamodularity/moduleplugin/ModulePluginSmokeTest.java

@@ -37,7 +37,7 @@ void before() throws IOException {
     }
 
     @CartesianProductTest(name = "smokeTest({arguments})")
-    @CartesianValueSource(strings = {"test-project", "test-project-kotlin", "test-project-groovy"})
+    @CartesianValueSource(strings = {"test-project", "test-project-kotlin-pre-1-7", "test-project-kotlin", "test-project-groovy"})
     @CartesianValueSource(strings = {"5.1", "5.6", "6.3", "6.4.1", "6.5.1", "6.8.3", "7.0", "7.2"})
     void smokeTest(String projectName, String gradleVersion) {
         LOGGER.lifecycle("Executing smokeTest of {} with Gradle {}", projectName, gradleVersion);
@@ -60,7 +60,7 @@ void smokeTest(String projectName, String gradleVersion) {
     }
 
     @CartesianProductTest(name = "smokeTestRun({arguments})")
-    @CartesianValueSource(strings = {"test-project", "test-project-kotlin", "test-project-groovy"})
+    @CartesianValueSource(strings = {"test-project", "test-project-kotlin-pre-1-7", "test-project-kotlin", "test-project-groovy"})
     @CartesianValueSource(strings = {"5.1", "5.6", "6.3", "6.4.1", "6.5.1", "6.8.3", "7.0", "7.2"})
     void smokeTestRun(String projectName, String gradleVersion) {
         LOGGER.lifecycle("Executing smokeTestRun of {} with Gradle {}", projectName, gradleVersion);
@@ -158,7 +158,7 @@ private static void assertExpectedClassFileFormats(
     }
 
     @CartesianProductTest(name = "smokeTestDist({arguments})")
-    @CartesianValueSource(strings = {"test-project", "test-project-kotlin", "test-project-groovy"})
+    @CartesianValueSource(strings = {"test-project", "test-project-kotlin-pre-1-7", "test-project-kotlin", "test-project-groovy"})
     @CartesianValueSource(strings = {"5.1", "5.6", "6.3", "6.4.1", "6.5.1", "6.8.3", "7.0", "7.2"})
     void smokeTestDist(String projectName, String gradleVersion) {
         LOGGER.lifecycle("Executing smokeTestDist of {} with Gradle {}", projectName, gradleVersion);
@@ -199,7 +199,7 @@ void smokeTestDist(String projectName, String gradleVersion) {
     }
 
     @CartesianProductTest(name = "smokeTestRunDemo({arguments})")
-    @CartesianValueSource(strings = {"test-project", "test-project-kotlin", "test-project-groovy"})
+    @CartesianValueSource(strings = {"test-project", "test-project-kotlin-pre-1-7", "test-project-kotlin", "test-project-groovy"})
     @CartesianValueSource(strings = {"5.1", "5.6", "6.3", "6.4.1", "6.5.1", "6.8.3", "7.0", "7.2"})
     void smokeTestRunDemo(String projectName, String gradleVersion) {
         LOGGER.lifecycle("Executing smokeTestRunDemo of {} with Gradle {}", projectName, gradleVersion);
@@ -218,7 +218,7 @@ void smokeTestRunDemo(String projectName, String gradleVersion) {
     }
 
     @CartesianProductTest(name = "smokeTestRunStartScripts({arguments})")
-    @CartesianValueSource(strings = {"test-project", "test-project-kotlin", "test-project-groovy"})
+    @CartesianValueSource(strings = {"test-project", "test-project-kotlin-pre-1-7", "test-project-kotlin", "test-project-groovy"})
     @CartesianValueSource(strings = {"5.1", "5.6", "6.3", "6.4.1", "6.5.1", "6.8.3", "7.0", "7.2"})
     void smokeTestRunStartScripts(String projectName, String gradleVersion) {
         LOGGER.lifecycle("Executing smokeTestRunScripts of {} with Gradle {}", projectName, gradleVersion);
@@ -248,7 +248,9 @@ private static void assertTasksSuccessful(BuildResult result, String subprojectN
     }
 
     private static boolean checkCombination(String projectName, String gradleVersion) {
-        if(projectName.equals("test-project-kotlin") && gradleVersion.compareTo("6.4") < 0) {
+        final boolean kotlin_NotSupported = projectName.startsWith("test-project-kotlin") && gradleVersion.compareTo("6.4") < 0;
+        final boolean kotlin1_7_NotSupported = projectName.equals("test-project-kotlin") && gradleVersion.compareTo("6.6") < 0;
+        if (kotlin_NotSupported || kotlin1_7_NotSupported) {
             LOGGER.lifecycle("Unsupported combination: {} / Gradle {}. Test skipped", projectName, gradleVersion);
             return false;
         }

test-project-kotlin-pre-1-7/README.md

@@ -0,0 +1,40 @@
+Introduction
+===
+
+This Kotlin test project can be used as a standalone test project to verify the published plugin.
+It is also used as an internal test project for testing unpublished plugin changes.
+
+Standalone test product
+===
+To run this product as a standalone test product use this command (launched from `test-project-kotlin` directory):
+```
+../gradlew clean build
+```
+
+It will use the most recent plugin version from Gradle maven repository to compile the test project with
+modules and run the unit tests.
+
+Testing locally published plugin
+===
+
+You can publish the plugin locally by running this command from the root directory:
+
+`./gradlew publishToMavenLocal`
+
+You can test the locally published plugin by running the following command from `test-project-kotlin` directory.
+
+`../gradlew -c local_maven_settings.gradle clean build` 
+
+It will use the locally published version of the plugin to compile the test project with 
+modules and run the unit tests.
+
+
+Internal test project
+===
+
+This mode is enabled in `ModulePluginSmokeTest` by passing an extra parameter (`-c smoke_test_settings.gradle`).
+`smoke_test_settings.gradle` script configures plugin management for `build.gradle.kts` so that the plugin cannot be resolved from
+a Gradle plugin repository. Instead, it relies on the smoke test to make the plugin under development available
+to the test project by sharing a classpath (using Gradle TestKit).
+
+__CAUTION:__ This approach won't work outside of the smoke test, it will break the build because the plugin jar won't be resolved.

test-project-kotlin-pre-1-7/build.gradle.kts

@@ -0,0 +1,59 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    kotlin("jvm") version "1.3.72" apply false
+    id("org.javamodularity.moduleplugin") version "1.8.11" apply false
+}
+
+subprojects {
+    apply(plugin = "kotlin")
+    apply(plugin = "org.javamodularity.moduleplugin")
+
+    //region https://docs.gradle.org/current/userguide/kotlin_dsl.html#using_kotlin_delegated_properties
+    val test by tasks.existing(Test::class)
+    val build by tasks
+    val javadoc by tasks
+
+    val implementation by configurations
+    val testImplementation by configurations
+    val testRuntimeOnly by configurations
+
+    val jUnitVersion: String by project
+    val jUnitPlatformVersion: String by project
+    //endregion
+
+    //region KOTLIN
+    tasks.withType<KotlinCompile> {
+        kotlinOptions.jvmTarget = "1.8"
+    }
+    dependencies {
+        implementation(kotlin("stdlib-jdk8"))
+    }
+    //endregion
+
+    repositories {
+        mavenCentral()
+    }
+
+    configure<org.javamodularity.moduleplugin.extensions.ModularityExtension> {
+        improveEclipseClasspathFile()
+        moduleVersion("1.2.3")
+    }
+
+    test {
+        useJUnitPlatform()
+
+        testLogging {
+            events("PASSED", "FAILED", "SKIPPED", "STANDARD_OUT")
+        }
+    }
+
+    dependencies {
+        testImplementation("org.junit.jupiter:junit-jupiter-api:$jUnitVersion")
+        testImplementation("org.junit.jupiter:junit-jupiter-params:$jUnitVersion")
+        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:$jUnitVersion")
+        testRuntimeOnly("org.junit.platform:junit-platform-launcher:$jUnitPlatformVersion")
+    }
+
+//    build.dependsOn(javadoc) // TODO: No public or protected classes found to document
+}

test-project-kotlin-pre-1-7/gradle.properties

@@ -0,0 +1,2 @@
+jUnitVersion = 5.6.2
+jUnitPlatformVersion = 1.6.2

test-project-kotlin-pre-1-7/greeter.api/build.gradle.kts

@@ -0,0 +1,21 @@
+import org.javamodularity.moduleplugin.extensions.CompileModuleOptions
+import org.javamodularity.moduleplugin.extensions.TestModuleOptions
+
+//region NO-OP (DSL testing)
+tasks.compileJava {
+    extensions.configure<CompileModuleOptions> {
+        addModules = listOf()
+        compileModuleInfoSeparately = false
+    }
+}
+
+tasks.test {
+    extensions.configure<TestModuleOptions> {
+        addModules = listOf()
+        runOnClasspath = false
+    }
+}
+
+modularity {
+}
+//endregion