Sascha Vogt created KARAF-6329:
----------------------------------
Summary: NPE on shutdown
Key: KARAF-6329
URL: https://issues.apache.org/jira/browse/KARAF-6329
Project: Karaf
Issue Type: Bug
Components: karaf
Affects Versions: 4.2.5, 4.3.0
Reporter: Sascha Vogt
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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