Can't use newer Java version in javeHome than what Gradle was invoked with

[Katrix]

Running most of my build script with a newer java version than what I'm invoking Gradle with (JAVA_HOME points to 11) using the new toolchains feature.

Within my build, I set the toolchain version to 15. I also set the runtime plugin to use this compiler as it's javaHome and jpackageHome.

java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(15)
    }
}

def java15home = javaToolchains.compilerFor {
    languageVersion = JavaLanguageVersion.of(15)
}.get().metadata.installationPath.asFile.absolutePath

runtime {
    javaHome = java15home

    jpackage {
        skipInstaller = true
        jpackageHome = java15home
    }
}

When I try to then run ./gradlew jpackage, it fails. This is the exception cause

``` Caused by: java.lang.module.InvalidModuleDescriptorException: Unsupported major.minor version 59.0 at java.base/jdk.internal.module.ModuleInfo.invalidModuleDescriptor(ModuleInfo.java:1091) at java.base/jdk.internal.module.ModuleInfo.doRead(ModuleInfo.java:195) at java.base/jdk.internal.module.ModuleInfo.read(ModuleInfo.java:131) at java_lang_module_ModuleDescriptor$read.call(Unknown Source) at org.beryx.runtime.util.ModuleManager.getModuleDescriptor(ModuleManager.groovy:59) at org.beryx.runtime.util.ModuleManager$getModuleDescriptor.callStatic(Unknown Source) at org.beryx.runtime.util.ModuleManager$_closure1.doCall(ModuleManager.groovy:30) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at org.beryx.runtime.util.ModuleManager.(ModuleManager.groovy:29) at org.beryx.runtime.util.SuggestedModulesBuilder.getModulesRequiredBy(SuggestedModulesBuilder.groovy:57) at org.beryx.runtime.util.SuggestedModulesBuilder.getProjectModules(SuggestedModulesBuilder.groovy:37) at org.beryx.runtime.impl.JreTaskImpl.getModules(JreTaskImpl.groovy:81) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at org.beryx.runtime.impl.JreTaskImpl.createJre(JreTaskImpl.groovy:57) at org.beryx.runtime.impl.JreTaskImpl.execute(JreTaskImpl.groovy:42) at org.beryx.runtime.JreTask.runtimeTaskAction(JreTask.groovy:79) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:58) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:51) at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:29) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$2.run(ExecuteActionsTaskExecuter.java:494) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29) at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:56) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$run$1(DefaultBuildOperationExecutor.java:71) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:45) at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:71) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:479) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:462) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$400(ExecuteActionsTaskExecuter.java:105) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:273) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:251) at org.gradle.internal.execution.steps.ExecuteStep.lambda$executeOperation$1(ExecuteStep.java:66) at org.gradle.internal.execution.steps.ExecuteStep.executeOperation(ExecuteStep.java:66) at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:34) at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:47) at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:44) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54) at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76) at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:44) at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:34) at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:72) at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:42) at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:53) at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:39) at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:44) at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:77) at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:58) at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:54) at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:32) at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:57) at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:38) at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:63) at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:30) at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:176) at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:76) at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:47) at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:43) at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:32) at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:39) at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:25) at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:102) at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:95) at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55) at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39) at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:83) at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:44) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27) at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:96) at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:52) at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:83) at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:54) at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:88) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:88) at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34) at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38) at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:46) at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:34) at org.gradle.internal.execution.steps.AssignWorkspaceStep.lambda$execute$0(AssignWorkspaceStep.java:43) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution$3.withWorkspace(ExecuteActionsTaskExecuter.java:286) at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:43) at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:33) at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:40) at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:30) at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:54) at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:40) at org.gradle.internal.execution.impl.DefaultExecutionEngine.execute(DefaultExecutionEngine.java:41) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:183) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:183) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:173) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109) at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46) at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57) at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56) at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:200) at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:195) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:75) at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:153) at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:68) at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:62) at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$call$2(DefaultBuildOperationExecutor.java:76) at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWithUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54) at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:76) at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52) at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:411) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:398) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:391) at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:377) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182) at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56) ```

It seems like it doesn't like the newer Java home when trying to discover used modules.

Running ./gradlew suggestModules using a JAVA_HOME with JDK 15 and pasting in what it suggests in the build script gets around the issue when JAVA_HOME no longer points to JDK 15.

[siordache]

When trying to suggest the modules, the plugin calls ModuleDescriptor.read(InputStream in), where the InputStream argument provides the content of a module-info.class compiled with Java 15. But the plugin runs with the Java version used to invoke Gradle, which in your case is 11. That's why you get the exception "Unsupported major.minor version 59.0".

I will provide a fix in the next few days, but at the moment I don't know what is the best way to tackle this issue. My current idea is that the plugin could fork a Java 15 process that executes the required ModuleDescriptor.read() operations. However, I'm not very happy with this solution, so I would be grateful for any suggestions.

[siordache]

@Katrix I added support for the toolchain in 1.12.2. You no longer need the java15home, because javaHome and jpackageHome are now configured by default with the value from toolchain.