RE: Blocked Thread while shutting down Felix / IPojo
Hi, Thanks for your analysis Richard, I have open an issue on iPojo here : https://issues.apache.org/jira/browse/FELIX-3421 It the meantime, I will try to find a workaround to solve my problem. WBR // David -Original Message- From: Richard S. Hall [mailto:he...@ungoverned.org] Sent: lundi 2 avril 2012 22:40 To: users@felix.apache.org Subject: Re: Blocked Thread while shutting down Felix / IPojo This is not related to FELIX-3393, although it appears related to the Aries Blueprint comment on FELIX-3393, which is also unrelated to FELIX-3393. It appears in both situations the component framework (Aries Blueprint and/or iPOJO) is synchronously dealing with a bundle being stopped while at the same time trying to register a service for that bundle. Since the component framework is holding and/or needs its own internal lock when dealing with the stopped bundle and registering the service, we get into a deadlock situation, since both threads also need the bundle lock too. Perhaps just open an issue against the framework to track this. - richard On 4/2/12 13:46, Gay David (Annecy) wrote: 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=0x06d6c000 nid=0xb00 waiting for monitor entry [0x07fbf000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:491) - waiting to lock 0xc048c790 (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=0x07050800 nid=0x6d8 in Object.wait() [0x084bd000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on 0xc029d238 (a [Ljava.lang.Object;) at java.lang.Object.wait(Object.java:485) at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4872) - locked 0xc029d238 (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 0xeafc8ea0 (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 0xc048c790 (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
Blocked Thread while shutting down Felix / IPojo
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=0x06d6c000 nid=0xb00 waiting for monitor entry [0x07fbf000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:491) - waiting to lock 0xc048c790 (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=0x07050800 nid=0x6d8 in Object.wait() [0x084bd000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on 0xc029d238 (a [Ljava.lang.Object;) at java.lang.Object.wait(Object.java:485) at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4872) - locked 0xc029d238 (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 0xeafc8ea0 (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 0xc048c790 (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
Re: Blocked Thread while shutting down Felix / IPojo
I don't know if that may be your issue but in the book OSGi in action [1] they recommend that if a bundle want to stop itself, it should do so in a different thread. This is to avoid possible deadlocks if as part of the bundle finalization there is any waiting for the calls to finish. You can refer to the book's source code examples [2]. HTH, Regards [1] http://www.manning.com/hall/ [2] http://code.google.com/p/osgi-in-action/source/browse/trunk/chapter03/shell-example/org.foo.shell/src/org/foo/shell/StopCommand.java On 02/04/12 14:46, Gay David (Annecy) wrote: 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=0x06d6c000 nid=0xb00 waiting for monitor entry [0x07fbf000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:491) - waiting to lock 0xc048c790 (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=0x07050800 nid=0x6d8 in Object.wait() [0x084bd000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on 0xc029d238 (a [Ljava.lang.Object;) at java.lang.Object.wait(Object.java:485) at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4872) - locked 0xc029d238 (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 0xeafc8ea0 (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 0xc048c790 (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
Re: Blocked Thread while shutting down Felix / IPojo
This is not related to FELIX-3393, although it appears related to the Aries Blueprint comment on FELIX-3393, which is also unrelated to FELIX-3393. It appears in both situations the component framework (Aries Blueprint and/or iPOJO) is synchronously dealing with a bundle being stopped while at the same time trying to register a service for that bundle. Since the component framework is holding and/or needs its own internal lock when dealing with the stopped bundle and registering the service, we get into a deadlock situation, since both threads also need the bundle lock too. Perhaps just open an issue against the framework to track this. - richard On 4/2/12 13:46, Gay David (Annecy) wrote: 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=0x06d6c000 nid=0xb00 waiting for monitor entry [0x07fbf000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.felix.ipojo.IPojoFactory.removeFactoryStateListener(IPojoFactory.java:491) - waiting to lock 0xc048c790 (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=0x07050800 nid=0x6d8 in Object.wait() [0x084bd000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on 0xc029d238 (a [Ljava.lang.Object;) at java.lang.Object.wait(Object.java:485) at org.apache.felix.framework.Felix.acquireBundleLock(Felix.java:4872) - locked 0xc029d238 (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 0xeafc8ea0 (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 0xc048c790 (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)
