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From "Gay David (Annecy)" <d...@axway.com>
Subject Blocked Thread while shutting down Felix / IPojo
Date Mon, 02 Apr 2012 17:46:46 GMT
Hi,

I'm currently have a problem with Felix and or IPojo.
Basically the problem is when Felix is starting up and services are still registering while
and in the meantime a stop Felix is request.
The code to stop is simple : getBundle(0).stop();

If I have a look at the thread dump on JVisualVM, I have (full thread dump in attachement)
:

"FelixStartLevel" daemon prio=6 tid=0x0000000006d6c000 nid=0xb00 waiting for monitor entry
[0x0000000007fbf000]
   java.lang.Thread.State: BLOCKED (on object monitor)
                at org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:491)
                - waiting to lock <0x00000000c048c790> (a org.apache.felix.ipojo.ComponentFactory)
                at org.apache.felix.ipojo.InstanceCreator.removeFactory(InstanceCreator.java:187)
                at org.apache.felix.ipojo.Extender.closeManagementFor(Extender.java:156)
                at org.apache.felix.ipojo.Extender.bundleChanged(Extender.java:129)
                at org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:868)
                at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:789)
                at org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:514)
                at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4245)
                at org.apache.felix.framework.Felix.stopBundle(Felix.java:2352)
                at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1215)
                at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:295)
                at java.lang.Thread.run(Unknown Source)

   Locked ownable synchronizers:
                - None

And

"Thread-2" daemon prio=6 tid=0x0000000007050800 nid=0x6d8 in Object.wait() [0x00000000084bd000]
   java.lang.Thread.State: WAITING (on object monitor)
                at java.lang.Object.wait(Native Method)
                - waiting on <0x00000000c029d238> (a [Ljava.lang.Object;)
                at java.lang.Object.wait(Object.java:485)
                at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4872)
                - locked <0x00000000c029d238> (a [Ljava.lang.Object;)
                at org.apache.felix.framework.Felix.registerService(Felix.java:3206)
                at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
                at org.apache.felix.ipojo.IPojoContext.registerService(IPojoContext.java:338)
                at org.apache.felix.ipojo.handlers.providedservice.ProvidedService.registerService(ProvidedService.java:345)
                - locked <0x00000000eafc8ea0> (a org.apache.felix.ipojo.handlers.providedservice.ProvidedService)
                at org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler.__stateChanged(ProvidedServiceHandler.java:494)
                at org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler.stateChanged(ProvidedServiceHandler.java)
                at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:471)
                at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:353)
                at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:166)
                at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:301)
                - locked <0x00000000c048c790> (a org.apache.felix.ipojo.ComponentFactory)
                at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:238)
                at org.apache.felix.ipojo.Factory$$Proxy.createComponentInstance(Unknown Source)
                at com.axway.cmp.ume.ui.internal.ComponentDefinition.__createAndStart(ComponentDefinition.java:147)
                at com.axway.cmp.ume.ui.internal.ComponentDefinition.createAndStart(ComponentDefinition.java)
                at com.axway.cmp.ume.ui.internal.ComponentDefinition.__validate(ComponentDefinition.java:85)
                at com.axway.cmp.ume.ui.internal.ComponentDefinition.validate(ComponentDefinition.java)
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
                at java.lang.reflect.Method.invoke(Unknown Source)
                at org.apache.felix.ipojo.util.Callback.call(Callback.java:237)
                at org.apache.felix.ipojo.util.Callback.call(Callback.java:193)
                at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallback.call(LifecycleCallback.java:86)
                at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.__stateChanged(LifecycleCallbackHandler.java:162)
                at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.stateChanged(LifecycleCallbackHandler.java)
                at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:471)
                at org.apache.felix.ipojo.InstanceManager.stateChanged(InstanceManager.java:1314)
                at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:496)
                at org.apache.felix.ipojo.HandlerManager.stateChanged(HandlerManager.java:239)
                at org.apache.felix.ipojo.Handler.setValidity(Handler.java:174)
                at org.apache.felix.ipojo.handlers.dependency.DependencyHandler.__checkContext(DependencyHandler.java:186)
                - locked <0x00000000c048e1a8> (a [Lorg.apache.felix.ipojo.handlers.dependency.Dependency;)
                at org.apache.felix.ipojo.handlers.dependency.DependencyHandler.checkContext(DependencyHandler.java)
                at org.apache.felix.ipojo.handlers.dependency.DependencyHandler.__validate(DependencyHandler.java:149)
                at org.apache.felix.ipojo.handlers.dependency.DependencyHandler.validate(DependencyHandler.java)
                at org.apache.felix.ipojo.util.DependencyModel.validate(DependencyModel.java:642)
                at org.apache.felix.ipojo.util.DependencyModel.computeDependencyState(DependencyModel.java:310)
                at org.apache.felix.ipojo.util.DependencyModel.manageArrival(DependencyModel.java:399)
                at org.apache.felix.ipojo.util.DependencyModel.addedService(DependencyModel.java:335)
                at org.apache.felix.ipojo.util.Tracker$Tracked.trackAdding(Tracker.java:725)
                at org.apache.felix.ipojo.util.Tracker$Tracked.track(Tracker.java:686)
                at org.apache.felix.ipojo.util.Tracker$Tracked.serviceChanged(Tracker.java:647)
                at org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:932)
                at org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:793)
                at org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:543)
                at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4261)
                at org.apache.felix.framework.Felix.registerService(Felix.java:3276)
                at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
                at org.apache.felix.ipojo.IPojoFactory.start(IPojoFactory.java:591)
                - locked <0x00000000c048c790> (a org.apache.felix.ipojo.ComponentFactory)
                at org.apache.felix.ipojo.Extender.createAbstractFactory(Extender.java:439)
                at org.apache.felix.ipojo.Extender.parse(Extender.java:264)
                at org.apache.felix.ipojo.Extender.startManagementFor(Extender.java:208)
                at org.apache.felix.ipojo.Extender.access$600(Extender.java:52)
                at org.apache.felix.ipojo.Extender$CreatorThread.run(Extender.java:682)
                at java.lang.Thread.run(Unknown Source)

While I'm still investigating what's happen, it looks like I'm having the issue https://issues.apache.org/jira/browse/FELIX-3393
 but I'm not sure
I'm using Felix 4.0.2, but I got the same problem with the latest trunk.

I would like to do a simple test case to reproduce the problem on a simple test case, but
without success for the moment.
Is it possible that the #3393 issue may be the root cause ?
Maybe an iPojo issue ? (I could post a brief sample of what I do with iPojo factories in ComponentDefinition
class if it helps)
Or maybe my code (Normally 99,99% of the time it's my fault) ;-)

Thanks for your help
WBR // David



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