':client-protocol:compileJava' doesn't point to correct JDK folder

[mr3y-the-programmer]

The problem: I've cloned the project and then I ran ./gradlew installDist , but the build fails due to the following error:

  Execution failed for task ':client-protocol:compileJava'.
> Could not find tools.jar. Please check that C:\Program Files\Java\jre1.8.0_241 contains a valid JDK installation.

though I have my JAVA_HOME been set correctly to: "C:\Program Files\Java\jdk-13.0.1", I don't know why this task uses the jre path even when I have a valid JAVA_HOME. Also, this is not the biggest problem, as you see I have JDK 13 in my environment and tools.jar file got removed since JDK 9 and its content is stored in different format since then. Source: Oracle migrating to JDK 9 doc

UPDATE: it seems that this task looks at Java Runtime Environment declared at Windows Registry, So I have updated it to add a new entry including my JDK 13 config, see screenshot

Also I have updated my environment variables to ensure no variable unintentionally reference old JRE path, though, it still uses the same old JRE 1.8

Complete Stacktrace:

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':client-protocol:compileJava'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:200)
        at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:198)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:179)
        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:372)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352)
        at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338)
        at org.gradle.execution.plan.DefaultPlanExecutor$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)
Caused by: java.lang.IllegalStateException: Could not find tools.jar. Please check that C:\Program Files\Java\jre1.8.0_271 contains a valid JDK installation.
        at org.gradle.api.internal.tasks.compile.JdkTools.<init>(JdkTools.java:76)
        at org.gradle.api.internal.tasks.compile.JavaHomeBasedJavaCompilerFactory.createJdkTools(JavaHomeBasedJavaCompilerFactory.java:48)
        at org.gradle.api.internal.tasks.compile.JavaHomeBasedJavaCompilerFactory.create(JavaHomeBasedJavaCompilerFactory.java:43)
        at org.gradle.api.internal.tasks.compile.JavaHomeBasedJavaCompilerFactory.create(JavaHomeBasedJavaCompilerFactory.java:29)
        at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.createCompileTask(JdkJavaCompiler.java:64)
        at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:54)
        at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:40)
        at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerWorkAction.execute(AbstractDaemonCompiler.java:135)
        at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)
        at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:49)
        at org.gradle.workers.internal.AbstractClassLoaderWorker$1.create(AbstractClassLoaderWorker.java:43)
        at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:97)
        at org.gradle.workers.internal.AbstractClassLoaderWorker.executeInClassLoader(AbstractClassLoaderWorker.java:43)
        at org.gradle.workers.internal.FlatClassLoaderWorker.run(FlatClassLoaderWorker.java:32)
        at org.gradle.workers.internal.FlatClassLoaderWorker.run(FlatClassLoaderWorker.java:22)
        at org.gradle.workers.internal.WorkerDaemonServer.run(WorkerDaemonServer.java:85)
        at org.gradle.workers.internal.WorkerDaemonServer.run(WorkerDaemonServer.java:55)
        at org.gradle.process.internal.worker.request.WorkerAction$1.call(WorkerAction.java:138)
        at org.gradle.process.internal.worker.child.WorkerLogEventListener.withWorkerLoggingProtocol(WorkerLogEventListener.java:41)
        at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:135)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
        at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
        at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
        at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
        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)

So, why this task uses jre path? and if it uses the correct JDK location, is it compatible with JDK 9 or not?

[mr3y-the-programmer]

As a workaround, I have tried to download tools.jar and place it within jre/lib path, then running ./gradlew installDist now gives me a new error:

Execution failed for task ':client-protocol:compileJava'.
> Could not load class 'com.sun.tools.javac.api.JavacTool

Any thoughts? maybe tools.jar I've downloaded is corrupted?

[mr3y-the-programmer]

Another Obvious workaround I've tried is to override JDK location with command line parameter, Like: gradlew installDist -Dorg.gradle.java.home="C:\Program Files\Java\jdk-13.0.1" But it also doesn't have any effect

[garry-jeromson]

I had the same problem, but trying to run ./gradlew installDist on macOS. Eventually got it working by switching to a Java 11 JDK; not a clue why this solved the issues with later JDKs, but maybe it's useful for someone.

[asodja]

Gradle-profiler uses toolchains and we currently set toolchains to use JDK 8 to compile a project. See https://docs.gradle.org/current/userguide/toolchains.html to learn how toolchains works. So you need a valid JDK 8 installation on your machine.

From the error message and path C:\Program Files\Java\jre1.8.0_241 it seems you have JRE 8 and not JDK 8. So that is why tools.jar can't be found.

I am closing this issue since it is a question of how to build a project and not a bug.