[jboss-jira] [JBoss JIRA] Commented: (JBRULES-2125) Drools core multithreading issue

[Barry Kaplan (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBRULES-2125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12483575#action_12483575 ] 

Barry Kaplan commented on JBRULES-2125:
---------------------------------------

I appear to be seeing the same problem. I'm running session.fireUntilHalt() in a thread and inserting events in the main thread and hit a deadlock:

Thread [Thread-1] (Suspended)	
	Unsafe.park(boolean, long) line: not available [native method]	
	LockSupport.park(Object) line: not available	
	ReentrantLock$NonfairSync(AbstractQueuedSynchronizer).parkAndCheckInterrupt() line: not available	
	ReentrantLock$NonfairSync(AbstractQueuedSynchronizer).acquireQueued(AbstractQueuedSynchronizer$Node, int) line: not available	
	ReentrantLock$NonfairSync(AbstractQueuedSynchronizer).acquire(int) line: not available	
	ReentrantLock$NonfairSync.lock() line: not available	
	ReentrantLock.lock() line: not available	
	NamedEntryPoint.retract(FactHandle, boolean, boolean, Rule, Activation) line: 258	
	NamedEntryPoint.retract(FactHandle) line: 245	
	ReteooWorkingMemory$WorkingMemoryReteExpireAction.execute(InternalWorkingMemory) line: 350	
	ReteooStatefulSession(AbstractWorkingMemory).executeQueuedActions() line: 1486	
	DefaultAgenda.fireUntilHalt(AgendaFilter) line: 1067	
	ReteooStatefulSession(AbstractWorkingMemory).fireUntilHalt(AgendaFilter) line: 701	
	ReteooStatefulSession(AbstractWorkingMemory).fireUntilHalt() line: 678	
	StatefulKnowledgeSessionImpl.fireUntilHalt() line: 195	
	DroolsFixture$1.run() line: 59	
	Thread.run() line: not available	


Thread [main] (Suspended)	
	ReteooStatefulSession(AbstractWorkingMemory).queueWorkingMemoryAction(WorkingMemoryAction) line: 1509	
	PropagationQueuingNode.assertObject(InternalFactHandle, PropagationContext, InternalWorkingMemory) line: 182	
	SingleObjectSinkAdapter.propagateAssertObject(InternalFactHandle, PropagationContext, InternalWorkingMemory) line: 42	
	ObjectTypeNode.assertObject(InternalFactHandle, PropagationContext, InternalWorkingMemory) line: 185	
	EntryPointNode.assertObject(InternalFactHandle, PropagationContext, ObjectTypeConf, InternalWorkingMemory) line: 146	
	NamedEntryPoint.insert(InternalFactHandle, Object, Rule, Activation) line: 152	
	NamedEntryPoint.insert(Object, boolean, boolean, Rule, Activation) line: 122	
	NamedEntryPoint.insert(Object) line: 80	
	NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]	
	NativeMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	Method.invoke(Object, Object...) line: not available	
	PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(Object, Object[]) line: 229	
	PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce(PojoMetaMethodSite).call(Object, Object[]) line: 52	
	PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce(AbstractCallSite).call(Object, Object) line: 124	
	EsperEventPatternsTest$_How_do_I_measure_the_rate_of_arrival_of_events_in_a_given_time_period_closure1.doCall(Object) line: 21	
	NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]	
	NativeMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	Method.invoke(Object, Object...) line: not available	
	CachedMethod.invoke(Object, Object[]) line: 86	
	CachedMethod(MetaMethod).doMethodInvoke(Object, Object[]) line: 234	
	ClosureMetaClass.invokeMethod(Class, Object, String, Object[], boolean, boolean) line: 272	
	ClosureMetaClass(MetaClassImpl).invokeMethod(Object, String, Object[]) line: 845	
	EsperEventPatternsTest$_How_do_I_measure_the_rate_of_arrival_of_events_in_a_given_time_period_closure1(Closure).call(Object[]) line: 280	
	EsperEventPatternsTest$_How_do_I_measure_the_rate_of_arrival_of_events_in_a_given_time_period_closure1(Closure).call(Object) line: 293	
	DefaultGroovyMethods.each(Iterator, Closure) line: 1106	
	DefaultGroovyMethods.each(Object, Closure) line: 1083	
	dgm$85.invoke(Object, Object[]) line: not available	
	PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(Object, Object[]) line: 270	
	PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce(PojoMetaMethodSite).call(Object, Object[]) line: 52	
	CallSiteArray.defaultCall(CallSite, Object, Object[]) line: 43	
	AbstractCallSite.call(Object, Object[]) line: 116	
	AbstractCallSite.call(Object, Object) line: 124	
	EsperEventPatternsTest.How_do_I_measure_the_rate_of_arrival_of_events_in_a_given_time_period() line: 17	
	NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]	
	NativeMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not available	
	Method.invoke(Object, Object...) line: not available	
	FrameworkMethod$1.runReflectiveCall() line: 44	
	FrameworkMethod$1(ReflectiveCallable).run() line: 15	
	FrameworkMethod.invokeExplosively(Object, Object...) line: 41	
	InvokeMethod.evaluate() line: 20	
	TestWatchman$1.evaluate() line: 48	
	BlockJUnit4ClassRunner.runChild(FrameworkMethod, RunNotifier) line: 76	
	BlockJUnit4ClassRunner.runChild(Object, RunNotifier) line: 50	
	ParentRunner$3.run() line: 193	
	ParentRunner$1.schedule(Runnable) line: 52	
	BlockJUnit4ClassRunner(ParentRunner<T>).runChildren(RunNotifier) line: 191	
	ParentRunner<T>.access$000(ParentRunner, RunNotifier) line: 42	
	ParentRunner$2.evaluate() line: 184	
	BlockJUnit4ClassRunner(ParentRunner<T>).run(RunNotifier) line: 236	
	JUnit4TestMethodReference(JUnit4TestReference).run(TestExecution) line: 46	
	TestExecution.run(ITestReference[]) line: 38	
	RemoteTestRunner.runTests(String[], String, TestExecution) line: 467	
	RemoteTestRunner.runTests(TestExecution) line: 683	
	RemoteTestRunner.run() line: 390	
	RemoteTestRunner.main(String[]) line: 197	



> Drools core multithreading issue
> --------------------------------
>
>                 Key: JBRULES-2125
>                 URL: https://jira.jboss.org/jira/browse/JBRULES-2125
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.0.1.FINAL
>         Environment: Java HotSpot v 1.6.0_06, WinXP SP3
>            Reporter: Andrey Nechaev
>            Assignee: Edson Tirelli
>         Attachments: Main.java
>
>
> Attachement below is the code showing the problems. 
> The program hangs and nothing is displayed in the Console.
> If I put lines 10-11 before the line 6, I get a NullPointerException:
> Exception in thread "main" java.lang.NullPointerException
>             at org.drools.reteoo.ObjectSource.addObjectSink(ObjectSource.java:124)
> ...
> But, if I comment out the lines 2&3, everything works ok.

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