[GRADLE-2367] NullPointerException when Junit tests are run in parallel Created: 28/Jun/12  Updated: 17/Jan/13  Resolved: 27/Dec/12

Status: Resolved
Project: Gradle
Affects Version/s: None
Fix Version/s: 1.4-rc-1

Type: Improvement
Reporter: Gradle Forums Assignee: Unassigned
Resolution: Fixed Votes: 1


 Description   

Ever since I upgraded from gradle-1.0-milestone-8 to gradle-1.0, gradle often seems to hang when running the tests. It doesn't happen all the time, but frequent enough to be an annoying problem (approximately once every five times). I do CPU intensive parallel testing that runs for approximately 40 minutes.

Every time the process hangs, I can see one or more of this stack trace in the log.

Could not dispatch message [ProducerStopped producerId: be23cf33-9cf4-46ed-a2c9-e6c24145d066, consumerId: 58a55dfd-f341-4cda-a6a5-1a656f01c265. Discarding message.
java.lang.NullPointerException
at org.gradle.messaging.remote.internal.Router$Group.send(Router.java:164)
at org.gradle.messaging.remote.internal.Router$Endpoint$2.run(Router.java:104)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:50)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:48)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Is this a bug? Any one else having the same issue? Following is the thread dump of the hung process.

2012-06-28 17:23:36
Full thread dump Java HotSpot(TM) Client VM (16.3-b01 mixed mode, sharing):

"Incoming Connection [9b0b54b4-1161-4914-9fe9-aef3bccc846b port:2093, addresses:[/127.0.0.1]]:41 worker Thread 4" prio=6 tid=0x03dbf800 nid=0x10ec waiting on condition [0x05b2f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4d9bc8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.DelayedReceive.receive(DelayedReceive.java:50)
    at org.gradle.messaging.dispatch.AsyncReceive.receiveMessages(AsyncReceive.java:142)
    at org.gradle.messaging.dispatch.AsyncReceive.access$000(AsyncReceive.java:36)
    at org.gradle.messaging.dispatch.AsyncReceive$1.run(AsyncReceive.java:88)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Incoming Connection [9b0b54b4-1161-4914-9fe9-aef3bccc846b port:2093, addresses:[/127.0.0.1]]:41 worker Thread 3" prio=6 tid=0x040ce800 nid=0x1ed8 waiting on condition [0x05adf000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4d9d28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"socket connection at /127.0.0.1:2093 with /127.0.0.1:3235 dispatch Thread 2" prio=6 tid=0x03de4400 nid=0x179c waiting on condition [0x0594f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4d9e28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.DelayedReceive.receive(DelayedReceive.java:50)
    at org.gradle.messaging.dispatch.AsyncReceive.receiveMessages(AsyncReceive.java:142)
    at org.gradle.messaging.dispatch.AsyncReceive.access$000(AsyncReceive.java:36)
    at org.gradle.messaging.dispatch.AsyncReceive$1.run(AsyncReceive.java:88)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"socket connection at /127.0.0.1:2093 with /127.0.0.1:3235 dispatch" prio=6 tid=0x03de5800 nid=0x1f10 waiting on condition [0x058ff000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4d9f88> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"socket connection at /127.0.0.1:2093 with /127.0.0.1:3235 send" prio=6 tid=0x03833c00 nid=0x1418 waiting on condition [0x0585f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4da088> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Incoming Connection [9b0b54b4-1161-4914-9fe9-aef3bccc846b port:2093, addresses:[/127.0.0.1]]:41 message router" prio=6 tid=0x03e52400 nid=0x188c waiting on condition [0x0580f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4da1b0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Dispatch org.gradle.api.internal.tasks.testing.processors.RestartEveryNTestClassProcessor@1379ccf" prio=6 tid=0x03f65800 nid=0x12d8 waiting on condition [0x0306f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e18b9e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Dispatch org.gradle.api.internal.tasks.testing.processors.RestartEveryNTestClassProcessor@e79202" prio=6 tid=0x03f65400 nid=0x1f74 waiting on condition [0x02fcf000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e4da270> (a java.util.concurrent.CountDownLatch$Sync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:905)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1217)
    at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:207)
    at org.gradle.messaging.remote.internal.ProtocolStack.stop(ProtocolStack.java:108)
    at org.gradle.internal.CompositeStoppable.stop(CompositeStoppable.java:122)
    at org.gradle.messaging.remote.internal.MessageHub.stop(MessageHub.java:192)
    at org.gradle.messaging.remote.internal.DefaultMultiChannelConnection.stop(DefaultMultiChannelConnection.java:63)
    at org.gradle.messaging.remote.internal.DefaultMessagingServer$ConnectionAsyncStoppable.stop(DefaultMessagingServer.java:91)
    at org.gradle.messaging.remote.internal.DefaultObjectConnection.stop(DefaultObjectConnection.java:64)
    at org.gradle.process.internal.DefaultWorkerProcess.waitForStop(DefaultWorkerProcess.java:143)
    at org.gradle.api.internal.tasks.testing.worker.ForkingTestClassProcessor.stop(ForkingTestClassProcessor.java:77)
    at org.gradle.api.internal.tasks.testing.processors.RestartEveryNTestClassProcessor.endBatch(RestartEveryNTestClassProcessor.java:60)
    at org.gradle.api.internal.tasks.testing.processors.RestartEveryNTestClassProcessor.processTestClass(RestartEveryNTestClassProcessor.java:48)
    at sun.reflect.GeneratedMethodAccessor330.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.dispatch.FailureHandlingDispatch.dispatch(FailureHandlingDispatch.java:29)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Dispatch org.gradle.api.internal.tasks.testing.results.AttachParentTestResultProcessor@14cba7a" prio=6 tid=0x03ab7400 nid=0x1eb4 waiting on condition [0x02f2f000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e18a150> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:114)
    at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
    at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Incoming TCP Connector" prio=6 tid=0x04363c00 nid=0x1338 runnable [0x0301f000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:145)

  • locked <0x2c1fffe8> (a java.lang.Object)
    at org.gradle.messaging.remote.internal.inet.TcpIncomingConnector$Receiver.run(TcpIncomingConnector.java:105)
    at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)

"Low Memory Detector" daemon prio=6 tid=0x028bdc00 nid=0x1898 runnable [0x00000000]
java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x028b7c00 nid=0x3cc waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE

"Attach Listener" daemon prio=10 tid=0x028b6400 nid=0x114 waiting on condition [0x00000000]
java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x028b5000 nid=0x1cc4 runnable [0x00000000]
java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=8 tid=0x028b0400 nid=0x1ee8 in Object.wait() [0x02a7f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

  • waiting on <0x27ef0288> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
  • locked <0x27ef0288> (a java.lang.ref.ReferenceQueue$Lock)
    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x028abc00 nid=0x1ee0 in Object.wait() [0x02a2f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

  • waiting on <0x27ef0310> (a java.lang.ref.Reference$Lock)
    at java.lang.Object.wait(Object.java:485)
    at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
  • locked <0x27ef0310> (a java.lang.ref.Reference$Lock)

"main" prio=6 tid=0x002b7000 nid=0x1c64 waiting on condition [0x0068e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

  • parking to wait for <0x2e18b250> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at org.gradle.messaging.dispatch.AsyncDispatch.stop(AsyncDispatch.java:180)
    at org.gradle.internal.CompositeStoppable.stop(CompositeStoppable.java:122)
    at org.gradle.messaging.actor.internal.DefaultActorFactory$NonBlockingActor.stop(DefaultActorFactory.java:151)
    at org.gradle.internal.CompositeStoppable.stop(CompositeStoppable.java:122)
    at org.gradle.api.internal.tasks.testing.processors.MaxNParallelTestClassProcessor.stop(MaxNParallelTestClassProcessor.java:75)
    at org.gradle.api.internal.tasks.testing.processors.TestMainAction.run(TestMainAction.java:45)
    at org.gradle.api.internal.tasks.testing.detection.DefaultTestExecuter.execute(DefaultTestExecuter.java:75)
    at org.gradle.api.tasks.testing.Test.executeTests(Test.java:395)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1047)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:877)
    at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:196)
    at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:102)
    at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:99)
    at org.gradle.api.tasks.testing.Test_Decorated.invokeMethod(Unknown Source)
    at groovy.lang.GroovyObject$invokeMethod.call(Unknown Source)
    at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTaskFactory.java:150)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTaskFactory.java:145)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:477)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:466)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:60)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:34)
    at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter$1.run(CacheLockHandlingTaskExecuter.java:34)
    at org.gradle.cache.internal.DefaultCacheAccess$2.create(DefaultCacheAccess.java:200)
    at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:172)
    at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:198)
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStore.java:111)
    at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.longRunningOperation(DefaultTaskArtifactStateCacheAccess.java:83)
    at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter.execute(CacheLockHandlingTaskExecuter.java:32)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:41)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:51)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:42)
    at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:247)
    at org.gradle.execution.DefaultTaskGraphExecuter.executeTask(DefaultTaskGraphExecuter.java:192)
    at org.gradle.execution.DefaultTaskGraphExecuter.doExecute(DefaultTaskGraphExecuter.java:177)
    at org.gradle.execution.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:83)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:36)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
    at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter$1.run(TaskCacheLockHandlingBuildExecuter.java:31)
    at org.gradle.cache.internal.DefaultCacheAccess$1.create(DefaultCacheAccess.java:111)
    at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:126)
    at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:109)
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:103)
    at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.useCache(DefaultTaskArtifactStateCacheAccess.java:79)
    at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter.execute(TaskCacheLockHandlingBuildExecuter.java:29)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:155)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:110)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:78)
    at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:42)
    at org.gradle.launcher.cli.RunBuildAction.execute(RunBuildAction.java:28)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
    at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:31)
    at org.gradle.launcher.exec.ExceptionReportingAction.execute(ExceptionReportingAction.java:20)
    at org.gradle.launcher.Main.doAction(Main.java:48)
    at org.gradle.launcher.exec.EntryPoint.run(EntryPoint.java:45)
    at org.gradle.launcher.Main.main(Main.java:39)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.gradle.launcher.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
    at org.gradle.launcher.ProcessBootstrap.run(ProcessBootstrap.java:32)
    at org.gradle.launcher.GradleMain.main(GradleMain.java:24)

"VM Thread" prio=10 tid=0x028aa400 nid=0x1568 runnable

"VM Periodic Task Thread" prio=10 tid=0x028c0800 nid=0x1f64 waiting on condition

JNI global references: 1480

 Comments   
Comment by James Pandavan [ 29/Jun/12 ]

Today the the exception stack traces were slightly different.

I forgot to mention another fact about these exceptions. They always occurred together in the log, possibly one single issue triggering them all.

Note that the gradle job continues to run despite the exceptions and eventually hangs.

java.lang.IllegalStateException: Cannot dispatch message, as this message dispatch has been stopped. Message: incoming [ConsumerUnavailable id: 50af7d13-a499-4c6c-9879-e8ba786b3c7d]
at org.gradle.messaging.dispatch.AsyncDispatch.dispatch(AsyncDispatch.java:147)
at org.gradle.messaging.remote.internal.ProtocolStack$BottomConnection.dispatch(ProtocolStack.java:292)
at org.gradle.messaging.dispatch.QueuingDispatch.dispatch(QueuingDispatch.java:59)
at org.gradle.messaging.remote.internal.Router$Endpoint.dispatchIncoming(Router.java:124)
at org.gradle.messaging.remote.internal.Router$RemoteGroup.removeRoute(Router.java:232)
at org.gradle.messaging.remote.internal.Router$Endpoint$2.run(Router.java:100)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:50)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:48)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Could not dispatch message [EndOfStreamEvent]. Discarding message.
java.lang.NullPointerException
at org.gradle.messaging.remote.internal.Router$RemoteGroup.removeRoute(Router.java:230)
at org.gradle.messaging.remote.internal.Router$Endpoint$2.run(Router.java:108)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:50)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:48)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Could not dispatch message [ProducerStopped producerId: 1b27615e-07e8-4a2a-89e1-fc97b219ffac, consumerId: 50af7d13-a499-4c6c-9879-e8ba786b3c7d. Discarding message.
java.lang.NullPointerException
at org.gradle.messaging.remote.internal.Router$Group.send(Router.java:164)
at org.gradle.messaging.remote.internal.Router$Endpoint$2.run(Router.java:104)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:50)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:48)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Could not dispatch message [ConsumerUnavailable id: 8b10d24b-be1c-4e36-a380-8025bdeb7ed2]. Discarding message.
java.lang.NullPointerException
at org.gradle.messaging.remote.internal.Router$LocalGroup.removeRoute(Router.java:189)
at org.gradle.messaging.remote.internal.Router$Endpoint$2.run(Router.java:100)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:50)
at org.gradle.messaging.remote.internal.Router$1.dispatch(Router.java:48)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.messaging.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Comment by Adam Murdoch [ 27/Dec/12 ]

This should be fixed now. Can you try a recent nightly build from http://gradle.org/nightly and let us know if the problem is fixed for you or not?

Generated at Wed Jun 30 12:19:59 CDT 2021 using Jira 8.4.2#804003-sha1:d21414fc212e3af190e92c2d2ac41299b89402cf.