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https://issues.apache.org/jira/browse/ARIES-1498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172442#comment-15172442
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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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