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https://issues.apache.org/jira/browse/FELIX-4088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13673330#comment-13673330
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Timothy Ward commented on FELIX-4088:
-------------------------------------
Hi [~djencks] - I have run the scenario again with a local build of the latest
SCR code and I'm no longer seeing errors. Previously they were occurring about
75% of the time, and I've run through 10 times since the update. This obviously
doesn't guarantee that there isn't another race condition in the framework, but
the fix you added has definitely improved things.
> NPE from SCR service unregistration
> -----------------------------------
>
> Key: FELIX-4088
> URL: https://issues.apache.org/jira/browse/FELIX-4088
> Project: Felix
> Issue Type: Bug
> Components: Configuration Admin, Declarative Services (SCR),
> Framework
> Affects Versions: framework-4.2.0, configadmin-1.2.8, scr-1.6.0
> Environment: MacOSX 8 processors
> Reporter: Timothy Ward
>
> When uninstalling a set of bundles I get the following exception.
> ERROR: Bundle com.paremus.dosgi.topologymanager [101] EventDispatcher: Error
> during dispatch. (java.lang.NullPointerException)
> java.lang.NullPointerException
> at org.apache.felix.framework.util.Util.getWire(Util.java:335)
> at
> org.apache.felix.framework.ServiceRegistrationImpl$ServiceReferenceImpl.isAssignableTo(ServiceRegistrationImpl.java:493)
> at
> org.apache.felix.framework.util.Util.isServiceAssignable(Util.java:280)
> at
> org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:916)
> 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:4401)
> at org.apache.felix.framework.Felix.access$000(Felix.java:74)
> at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java:390)
> at
> org.apache.felix.framework.ServiceRegistry.unregisterService(ServiceRegistry.java:151)
> at
> org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:127)
> at
> com.paremus.frameworkintercept.DelegatingServiceRegistration.unregister(DelegatingServiceRegistration.java:37)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:470)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Satisfied.deactivate(AbstractComponentManager.java:1074)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager.deactivateInternal(AbstractComponentManager.java:338)
> at
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.reconfigure(ImmediateComponentManager.java:414)
> at
> org.apache.felix.scr.impl.config.ConfiguredComponentHolder.configurationDeleted(ConfiguredComponentHolder.java:152)
> at
> org.apache.felix.scr.impl.config.ConfigurationComponentRegistry.configurationEvent(ConfigurationComponentRegistry.java:247)
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:1832)
> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:104)
> at java.lang.Thread.run(Thread.java:722)
> ERROR: Bundle org.cauldron.newton.management.monitor [85] EventDispatcher:
> Error during dispatch. (java.lang.NullPointerException)
> java.lang.NullPointerException
> at org.apache.felix.framework.util.Util.getWire(Util.java:335)
> at
> org.apache.felix.framework.ServiceRegistrationImpl$ServiceReferenceImpl.isAssignableTo(ServiceRegistrationImpl.java:493)
> at
> org.apache.felix.framework.util.Util.isServiceAssignable(Util.java:280)
> at
> org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:916)
> 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:4401)
> at org.apache.felix.framework.Felix.access$000(Felix.java:74)
> at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java:390)
> at
> org.apache.felix.framework.ServiceRegistry.unregisterService(ServiceRegistry.java:151)
> at
> org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:127)
> at
> com.paremus.frameworkintercept.DelegatingServiceRegistration.unregister(DelegatingServiceRegistration.java:37)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager.unregisterComponentService(AbstractComponentManager.java:470)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager$Satisfied.deactivate(AbstractComponentManager.java:1074)
> at
> org.apache.felix.scr.impl.manager.AbstractComponentManager.deactivateInternal(AbstractComponentManager.java:338)
> at
> org.apache.felix.scr.impl.manager.ImmediateComponentManager.reconfigure(ImmediateComponentManager.java:414)
> at
> org.apache.felix.scr.impl.config.ConfiguredComponentHolder.configurationDeleted(ConfiguredComponentHolder.java:152)
> at
> org.apache.felix.scr.impl.config.ConfigurationComponentRegistry.configurationEvent(ConfigurationComponentRegistry.java:247)
> at
> org.apache.felix.cm.impl.ConfigurationManager$FireConfigurationEvent.run(ConfigurationManager.java:1832)
> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:104)
> at java.lang.Thread.run(Thread.java:722)
> One of the bundles is an extender, that publishes a Configuration using
> Config Admin. This configuration is picked up by DS to create a new Service
> using a ManagedServiceFactory.
> At some point in the teardown I seem to be in the state where:
> 1. The configuration is being deleted because the target bundle is being
> uninstalled
> 2. The Bundle containing the SCR component is being uninstalled
> 3. SCR is attempting to unregister the managed service because of the
> asynchronous notification from config admin.
> I'm not sure whether the fault lies with the core framework or with scr, or
> with config admin. My guess is that SCR is at fault for trying to unregister
> a service for an uninstalled bundle, but that the framework shouldn't be
> blowing up either. Config Admin is probably an innocent bystander.
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