quarkusio · joschi · Nov 8, 2024
diff --git a/devtools/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/GradleUtils.java b/devtools/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/GradleUtils.java
@@ -11,7 +11,13 @@
 import org.gradle.api.artifacts.Dependency;
 import org.gradle.api.artifacts.ModuleDependency;
 import org.gradle.api.attributes.Category;
+import org.gradle.api.model.ObjectFactory;
 import org.gradle.api.plugins.JavaPlugin;
+import org.gradle.jvm.toolchain.JavaToolchainSpec;
+import org.gradle.jvm.toolchain.internal.SpecificInstallationToolchainSpec;
+import org.gradle.process.internal.DefaultJavaExecSpec;
+
+import javax.annotation.Nullable;
 
 public class GradleUtils {
 
@@ -58,4 +64,13 @@ public static List<Dependency> listProjectBoms(Project project) {
         return boms;
     }
 
+    @Nullable
+    public static JavaToolchainSpec getExecutableOverrideToolchainSpec(ObjectFactory objectFactory) {
+        String customExecutable = objectFactory.newInstance(DefaultJavaExecSpec.class).getExecutable();
+        if (customExecutable != null) {
+            return SpecificInstallationToolchainSpec.fromJavaExecutable(objectFactory, customExecutable);
+        }
+
+        return null;
+    }
 }
diff --git a/devtools/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/QuarkusPlugin.java b/devtools/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/QuarkusPlugin.java
@@ -8,6 +8,7 @@
 import java.util.HashSet;
 import java.util.Optional;
 import java.util.Set;
+import java.util.function.BiFunction;
 import java.util.stream.Collectors;
 
 import javax.inject.Inject;
@@ -26,6 +27,7 @@
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.plugins.BasePlugin;
 import org.gradle.api.plugins.JavaPlugin;
+import org.gradle.api.plugins.JavaPluginExtension;
 import org.gradle.api.provider.Property;
 import org.gradle.api.provider.Provider;
 import org.gradle.api.specs.Spec;
@@ -35,6 +37,8 @@
 import org.gradle.api.tasks.TaskProvider;
 import org.gradle.api.tasks.compile.JavaCompile;
 import org.gradle.api.tasks.testing.Test;
+import org.gradle.jvm.toolchain.JavaToolchainService;
+import org.gradle.jvm.toolchain.JavaToolchainSpec;
 import org.gradle.tooling.provider.model.ToolingModelBuilderRegistry;
 import org.gradle.util.GradleVersion;
 
@@ -208,21 +212,22 @@ private void registerTasks(Project project, QuarkusPluginExtension quarkusExt) {
         // quarkusGenerateCode
         TaskProvider<QuarkusGenerateCode> quarkusGenerateCode = tasks.register(QUARKUS_GENERATE_CODE_TASK_NAME,
                 QuarkusGenerateCode.class, LaunchMode.NORMAL, SourceSet.MAIN_SOURCE_SET_NAME);
-        quarkusGenerateCode.configure(task -> configureGenerateCodeTask(task, quarkusGenerateAppModelTask,
+        quarkusGenerateCode.configure(task -> configureGenerateCodeTask(project, task, quarkusGenerateAppModelTask,
                 QuarkusGenerateCode.QUARKUS_GENERATED_SOURCES));
         // quarkusGenerateCodeDev
         TaskProvider<QuarkusGenerateCode> quarkusGenerateCodeDev = tasks.register(QUARKUS_GENERATE_CODE_DEV_TASK_NAME,
                 QuarkusGenerateCode.class, LaunchMode.DEVELOPMENT, SourceSet.MAIN_SOURCE_SET_NAME);
         quarkusGenerateCodeDev.configure(task -> {
             task.dependsOn(quarkusGenerateCode);
-            configureGenerateCodeTask(task, quarkusGenerateDevAppModelTask, QuarkusGenerateCode.QUARKUS_GENERATED_SOURCES);
+            configureGenerateCodeTask(project, task, quarkusGenerateDevAppModelTask,
+                    QuarkusGenerateCode.QUARKUS_GENERATED_SOURCES);
         });
         // quarkusGenerateCodeTests
         TaskProvider<QuarkusGenerateCode> quarkusGenerateCodeTests = tasks.register(QUARKUS_GENERATE_CODE_TESTS_TASK_NAME,
                 QuarkusGenerateCode.class, LaunchMode.TEST, SourceSet.TEST_SOURCE_SET_NAME);
         quarkusGenerateCodeTests.configure(task -> {
             task.dependsOn("compileQuarkusTestGeneratedSourcesJava");
-            configureGenerateCodeTask(task, quarkusGenerateTestAppModelTask,
+            configureGenerateCodeTask(project, task, quarkusGenerateTestAppModelTask,
                     QuarkusGenerateCode.QUARKUS_TEST_GENERATED_SOURCES);
         });
 
@@ -534,9 +539,24 @@ private static void configureQuarkusBuildTask(Project project, QuarkusPluginExte
         task.setCompileClasspath(mainSourceSet.getCompileClasspath().plus(mainSourceSet.getRuntimeClasspath())
                 .plus(mainSourceSet.getAnnotationProcessorPath())
                 .plus(mainSourceSet.getResources()));
+
+        Provider<JavaToolchainSpec> toolchainOverrideSpec = project.provider(() ->
+                GradleUtils.getExecutableOverrideToolchainSpec(project.getObjects()));
+        task.getJavaLauncher().convention(getToolchainTool(project, JavaToolchainService::launcherFor, toolchainOverrideSpec));
+    }
+
+    private static <T> Provider<T> getToolchainTool(
+            Project project,
+            BiFunction<JavaToolchainService, JavaToolchainSpec, Provider<T>> toolMapper,
+            Provider<JavaToolchainSpec> toolchainOverride
+    ) {
+        JavaToolchainService service = project.getExtensions().getByType(JavaToolchainService.class);
+        JavaPluginExtension extension = project.getExtensions().getByType(JavaPluginExtension.class);
+        return toolchainOverride.orElse(extension.getToolchain())
+                .flatMap(spec -> toolMapper.apply(service, spec));
     }
 
-    private static void configureGenerateCodeTask(QuarkusGenerateCode task,
+    private static void configureGenerateCodeTask(Project project, QuarkusGenerateCode task,
             TaskProvider<QuarkusApplicationModelTask> applicationModelTaskTaskProvider, String generateSourcesDir) {
         SourceSet generatedSources = getSourceSet(task.getProject(), generateSourcesDir);
         Set<File> sourceSetOutput = generatedSources.getOutput().filter(f -> f.getName().equals(generateSourcesDir)).getFiles();
@@ -547,6 +567,10 @@ private static void configureGenerateCodeTask(QuarkusGenerateCode task,
         task.getApplicationModel()
                 .set(applicationModelTaskTaskProvider.flatMap(QuarkusApplicationModelTask::getApplicationModel));
         task.getGeneratedOutputDirectory().set(generatedSources.getJava().getClassesDirectory());
+
+        Provider<JavaToolchainSpec> toolchainOverrideSpec = project.provider(() ->
+                GradleUtils.getExecutableOverrideToolchainSpec(project.getObjects()));
+        task.getJavaLauncher().convention(getToolchainTool(project, JavaToolchainService::launcherFor, toolchainOverrideSpec));
     }
 
     private void createSourceSets(Project project) {

diff --git a/...s/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/tasks/QuarkusTask.java b/...s/gradle/gradle-application-plugin/src/main/java/io/quarkus/gradle/tasks/QuarkusTask.java
@@ -8,8 +8,16 @@
 
 import javax.inject.Inject;
 
+import io.quarkus.gradle.GradleUtils;
 import org.gradle.api.Action;
 import org.gradle.api.DefaultTask;
+import org.gradle.api.model.ObjectFactory;
+import org.gradle.api.provider.Property;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.provider.ProviderFactory;
+import org.gradle.api.tasks.Nested;
+import org.gradle.jvm.toolchain.JavaLauncher;
+import org.gradle.jvm.toolchain.JavaToolchainService;
 import org.gradle.process.JavaForkOptions;
 import org.gradle.workers.ProcessWorkerSpec;
 import org.gradle.workers.WorkQueue;
@@ -24,6 +32,7 @@ public abstract class QuarkusTask extends DefaultTask {
     private final transient QuarkusPluginExtension extension;
     protected final File projectDir;
     protected final File buildDir;
+    private final Property<JavaLauncher> javaLauncher;
 
     QuarkusTask(String description) {
         this(description, false);
@@ -36,16 +45,38 @@ public abstract class QuarkusTask extends DefaultTask {
         this.projectDir = getProject().getProjectDir();
         this.buildDir = getProject().getBuildDir();
 
+        ObjectFactory objectFactory = getObjectFactory();
+        JavaToolchainService javaToolchainService = getJavaToolchainService();
+        Provider<JavaLauncher> javaLauncherConvention = getProviderFactory()
+                .provider(() -> GradleUtils.getExecutableOverrideToolchainSpec(objectFactory))
+                .flatMap(javaToolchainService::launcherFor)
+                .orElse(javaToolchainService.launcherFor(it -> {}));
+        this.javaLauncher = objectFactory.property(JavaLauncher.class).convention(javaLauncherConvention);
+
         // Calling this method tells Gradle that it should not fail the build. Side effect is that the configuration
         // cache will be at least degraded, but the build will not fail.
         if (!configurationCacheCompatible) {
             notCompatibleWithConfigurationCache("The Quarkus Plugin isn't compatible with the configuration cache");
         }
     }
 
+    @Inject
+    protected abstract ObjectFactory getObjectFactory();
+
+    @Inject
+    protected abstract ProviderFactory getProviderFactory();
+
+    @Inject
+    protected abstract JavaToolchainService getJavaToolchainService();
+
     @Inject
     protected abstract WorkerExecutor getWorkerExecutor();
 
+    @Nested
+    public Property<JavaLauncher> getJavaLauncher() {
+        return javaLauncher;
+    }
+
     QuarkusPluginExtension extension() {
         return extension;
     }
@@ -60,14 +91,18 @@ WorkQueue workQueue(Map<String, String> configMap, List<Action<? super JavaForkO
         }
 
         return workerExecutor.processIsolation(processWorkerSpec -> configureProcessWorkerSpec(processWorkerSpec,
-                configMap, forkOptionsSupplier));
+                configMap, forkOptionsSupplier, getJavaLauncher().get()));
     }
 
     private void configureProcessWorkerSpec(ProcessWorkerSpec processWorkerSpec, Map<String, String> configMap,
-            List<Action<? super JavaForkOptions>> customizations) {
+            List<Action<? super JavaForkOptions>> customizations, JavaLauncher launcher) {
         JavaForkOptions forkOptions = processWorkerSpec.getForkOptions();
         customizations.forEach(a -> a.execute(forkOptions));
 
+        if (launcher != null) {
+            forkOptions.executable(launcher.getExecutablePath().getAsFile().getAbsolutePath());
+        }
+
         // Propagate user.dir to load config sources that use it (instead of the worker user.dir)
         String userDir = configMap.get("user.dir");
         if (userDir != null) {

diff --git a/...le/gradle-application-plugin/src/test/java/io/quarkus/gradle/tasks/JavaToolchainTest.java b/...le/gradle-application-plugin/src/test/java/io/quarkus/gradle/tasks/JavaToolchainTest.java
@@ -0,0 +1,64 @@
+package io.quarkus.gradle.tasks;
+
+import org.apache.commons.io.FileUtils;
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.GradleRunner;
+import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.net.URL;
+import java.nio.file.Path;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+public class JavaToolchainTest {
+
+    @TempDir
+    Path testProjectDir;
+
+    @Test
+    void quarkusIsUsingJavaToolchain() throws Exception {
+        URL url = getClass().getClassLoader().getResource("io/quarkus/gradle/tasks/toolchain/main");
+        FileUtils.copyDirectory(new File(url.toURI()), testProjectDir.toFile());
+        FileUtils.copyFile(new File("../gradle.properties"), testProjectDir.resolve("gradle.properties").toFile());
+
+        GradleRunner.create()
+                .withPluginClasspath()
+                .withProjectDir(testProjectDir.toFile())
+                .withArguments("build", "--info", "--stacktrace", "--build-cache", "--configuration-cache")
+                // .build() checks whether the build failed, which is good enough for this test
+                .build();
+    }
+
+    @Test
+    void quarkusPluginCanOverrideJavaToolchain() throws Exception {
+        URL url = getClass().getClassLoader().getResource("io/quarkus/gradle/tasks/toolchain/custom");
+        FileUtils.copyDirectory(new File(url.toURI()), testProjectDir.toFile());
+        FileUtils.copyFile(new File("../gradle.properties"), testProjectDir.resolve("gradle.properties").toFile());
+
+        GradleRunner.create()
+                .withPluginClasspath()
+                .withProjectDir(testProjectDir.toFile())
+                .withArguments("build", "--info", "--stacktrace", "--build-cache", "--configuration-cache")
+                // .build() checks whether the build failed, which is good enough for this test
+                .build();
+    }
+
+    @Test
+    void quarkusPluginFailsWithIncompatibleToolchains() throws Exception {
+        URL url = getClass().getClassLoader().getResource("io/quarkus/gradle/tasks/toolchain/fail");
+        FileUtils.copyDirectory(new File(url.toURI()), testProjectDir.toFile());
+        FileUtils.copyFile(new File("../gradle.properties"), testProjectDir.resolve("gradle.properties").toFile());
+
+        BuildResult buildResult = GradleRunner.create()
+                .withPluginClasspath()
+                .withProjectDir(testProjectDir.toFile())
+                .withArguments("build", "--info", "--stacktrace", "--build-cache", "--configuration-cache")
+                .buildAndFail();
+
+        assertThat(buildResult.task(":quarkusAppPartsBuild").getOutcome()).isEqualTo(TaskOutcome.FAILED);
+        assertThat(buildResult.getOutput()).contains("java.lang.UnsupportedClassVersionError");
+    }
+}
diff --git a/...ation-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/custom/build.gradle.kts b/...ation-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/custom/build.gradle.kts
@@ -0,0 +1,35 @@
+plugins {
+    java
+    id("io.quarkus")
+}
+
+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    implementation(enforcedPlatform("io.quarkus:quarkus-bom:${project.property("version")}"))
+    implementation("io.quarkus:quarkus-core")
+    implementation("jakarta.inject:jakarta.inject-api:2.0.1")
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+tasks.withType(io.quarkus.gradle.tasks.QuarkusTask::class.java) {
+    javaLauncher = javaToolchains.launcherFor {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+
+}
diff --git a/...on-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/custom/settings.gradle.kts b/...on-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/custom/settings.gradle.kts
@@ -0,0 +1,5 @@
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version("0.8.0")
+}
+
+rootProject.name = "gradle-java-toolchain"
diff --git a/...c/test/resources/io/quarkus/gradle/tasks/toolchain/custom/src/main/java/org/acme/Foo.java b/...c/test/resources/io/quarkus/gradle/tasks/toolchain/custom/src/main/java/org/acme/Foo.java
@@ -0,0 +1,8 @@
+package org.acme;
+
+import io.smallrye.config.ConfigMapping;
+
+@ConfigMapping(prefix = "foo")
+public interface Foo {
+    String string();
+}
diff --git a/...ication-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/build.gradle.kts b/...ication-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/build.gradle.kts
@@ -0,0 +1,35 @@
+plugins {
+    java
+    id("io.quarkus")
+}
+
+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+}
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    implementation(enforcedPlatform("io.quarkus:quarkus-bom:${project.property("version")}"))
+    implementation("io.quarkus:quarkus-core")
+    implementation("jakarta.inject:jakarta.inject-api:2.0.1")
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+tasks.withType(io.quarkus.gradle.tasks.QuarkusTask::class.java) {
+    javaLauncher = javaToolchains.launcherFor {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+
+}
diff --git a/...tion-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/settings.gradle.kts b/...tion-plugin/src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/settings.gradle.kts
@@ -0,0 +1,5 @@
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version("0.8.0")
+}
+
+rootProject.name = "gradle-java-toolchain"
diff --git a/...src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/src/main/java/org/acme/Foo.java b/...src/test/resources/io/quarkus/gradle/tasks/toolchain/fail/src/main/java/org/acme/Foo.java
@@ -0,0 +1,8 @@
+package org.acme;
+
+import io.smallrye.config.ConfigMapping;
+
+@ConfigMapping(prefix = "foo")
+public interface Foo {
+    String string();
+}