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Posted to dev@aries.apache.org by "John Ross (JIRA)" <ji...@apache.org> on 2016/02/29 20:28:18 UTC
[jira] [Commented] (ARIES-1498) NullPointerException NPE Blueprint
Container AbstractServiceReferenceRecipe setSatisfied
[ https://issues.apache.org/jira/browse/ARIES-1498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172442#comment-15172442 ]
John Ross commented on ARIES-1498:
----------------------------------
Line 419 is where the satisfactionListener is accessed. This is an unprotected, mutable object variable. It is set in the start method, unset in the stop method, and operated on in the setSatisfied method.
There certainly appears to be a visibility issue here unless there is some protection offered higher up the stack that I'm not seeing. This could have occurred, therefore, after the start method had been called on one thread followed by the setSatisfied method on another.
Another, and probably more concerning, possibility would be that the setSatisfied method was called after the stop method. I'm not familiar enough with blueprint to know whether this is possible or not.
> NullPointerException NPE Blueprint Container AbstractServiceReferenceRecipe setSatisfied
> ----------------------------------------------------------------------------------------
>
> Key: ARIES-1498
> URL: https://issues.apache.org/jira/browse/ARIES-1498
> Project: Aries
> Issue Type: Bug
> Components: Blueprint
> Affects Versions: blueprint-core-1.5.0
> Reporter: John Ross
>
> [2/28/16 6:12:25:150 EST] 00000010 LogService-115-BPCompWABClient E CWWKE0701E: FrameworkEvent ERROR Bundle:BPCompWABClient(id=115) java.lang.NullPointerException
> at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.setSatisfied(AbstractServiceReferenceRecipe.java:419)
> at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.serviceAdded(AbstractServiceReferenceRecipe.java:361)
> at org.apache.aries.blueprint.container.AbstractServiceReferenceRecipe.serviceChanged(AbstractServiceReferenceRecipe.java:341)
> at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:109)
> at org.eclipse.osgi.internal.framework.BundleContextImpl.dispatchEvent(BundleContextImpl.java:915)
> at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
> at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
> at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:862)
> at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:801)
> at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:127)
> at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:225)
> at org.eclipse.osgi.internal.framework.BundleContextImpl.registerService(BundleContextImpl.java:464)
> at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerService(BlueprintContainerImpl.java:485)
> at org.apache.aries.blueprint.container.ServiceRecipe.register(ServiceRecipe.java:193)
> at org.apache.aries.blueprint.container.BlueprintContainerImpl.registerServices(BlueprintContainerImpl.java:739)
> at org.apache.aries.blueprint.container.BlueprintContainerImpl.doRun(BlueprintContainerImpl.java:406)
> at org.apache.aries.blueprint.container.BlueprintContainerImpl.run(BlueprintContainerImpl.java:275)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:483)
> at java.util.concurrent.FutureTask.run(FutureTask.java:274)
> at org.apache.aries.blueprint.container.ExecutorServiceWrapper.run(ExecutorServiceWrapper.java:106)
> at org.apache.aries.blueprint.utils.threading.impl.DiscardableRunnable.run(DiscardableRunnable.java:48)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:483)
> at java.util.concurrent.FutureTask.run(FutureTask.java:274)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:190)
> at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
> at java.lang.Thread.run(Thread.java:798)
> Event:org.osgi.framework.FrameworkEvent[source=BPCompWABClient_1.0.0 [115]]
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