[jira] [Assigned] (KARAF-6329) NPE on shutdown

["Jean-Baptiste Onofré (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KARAF-6329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Baptiste Onofré reassigned KARAF-6329:
-------------------------------------------

    Assignee: Jean-Baptiste Onofré

> NPE on shutdown
> ---------------
>
>                 Key: KARAF-6329
>                 URL: https://issues.apache.org/jira/browse/KARAF-6329
>             Project: Karaf
>          Issue Type: Bug
>          Components: karaf
>    Affects Versions: 4.3.0, 4.2.5
>            Reporter: Sascha Vogt
>            Assignee: Jean-Baptiste Onofré
>            Priority: Minor
>
> We found a NPE on shutdown:
> {noformat}
> 2019-05-23T09:56:56.407+0000	 ERROR	 Felix	 FelixStartLevel	 [:]	 	 	 	 	 Bundle org.apache.karaf.features.core [11] EventDispatcher: Error during dispatch. (java.lang.NullPointerException)
> java.lang.NullPointerException: null
> 	at org.apache.karaf.features.internal.osgi.Activator$2.removedService(Activator.java:306) ~[?:?]
> 	at org.apache.karaf.features.internal.osgi.Activator$2.removedService(Activator.java:292) ~[?:?]
> 	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:967) ~[?:?]
> 	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:870) ~[?:?]
> 	at org.osgi.util.tracker.AbstractTracked.untrack(AbstractTracked.java:341) ~[?:?]
> 	at org.osgi.util.tracker.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:909) ~[?:?]
> 	at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990) ~[?:?]
> 	at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838) [?:?]
> 	at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545) [?:?]
> 	at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4595) [?:?]
> 	at org.apache.felix.framework.Felix.access$000(Felix.java:106) [?:?]
> 	at org.apache.felix.framework.Felix$1.serviceChanged(Felix.java:420) [?:?]
> 	at org.apache.felix.framework.ServiceRegistry.unregisterService(ServiceRegistry.java:170) [?:?]
> 	at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:144) [?:?]
> 	at org.apache.felix.framework.ServiceRegistry.unregisterServices(ServiceRegistry.java:241) [?:?]
> 	at org.apache.felix.framework.Felix.stopBundle(Felix.java:2661) [?:?]
> 	at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1391) [?:?]
> 	at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308) [?:?]
> 	at java.lang.Thread.run(Thread.java:748) [?:?]{noformat}
> Could it be a race condition, that even the tracker is closed it still gets a few removedService / addedService calls from another thread if the other thread already has a reference to the tracker once close from the first thread is called?
> In that case, could a simple nullcheck avoid the issue?
> Code: [https://github.com/apache/karaf/blob/master/features/core/src/main/java/org/apache/karaf/features/internal/osgi/Activator.java#L306]



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