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https://issues.apache.org/jira/browse/FELIX-6845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18091122#comment-18091122
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Apoorv Rastogi commented on FELIX-6845:
---------------------------------------
*Root cause:* Race condition during service unregistration, a
ServiceEvent.MODIFIED can be dispatched to ServiceListeners (including Felix's
internal Log) after the registering bundle has already been unregistered.
*Fix:* Add a null check on the bundle reference in Log.serviceChanged() and
return early if null, silently skipping the log entry for already-unregistered
services.
*PR:* https://github.com/apache/felix-dev/pull/521
> NullPointerException in Log.serviceChanged() when
> ServiceReference.getBundle() returns null
> -------------------------------------------------------------------------------------------
>
> Key: FELIX-6845
> URL: https://issues.apache.org/jira/browse/FELIX-6845
> Project: Felix
> Issue Type: Bug
> Components: Log Service
> Reporter: Ankur Singla
> Priority: Major
>
> [https://github.com/apache/felix-dev/blob/master/log/src/main/java/org/apache/felix/log/Log.java#L326]
> *Description:*
> Log.serviceChanged() throws a NullPointerException when
> ServiceReference.getBundle() returns null during service event processing.
> Per the OSGi spec, ServiceReference.getBundle() returns null when the
> registering bundle has already been unregistered. This is a known race
> condition during service unregistration, but the Felix log layer does not
> guard against it.
> *Stack trace:*
> {code:xml}
> java.lang.NullPointerException: Cannot invoke
> "org.osgi.framework.Bundle.getSymbolicName()"
> because the return value of
> "org.osgi.framework.ServiceReference.getBundle()" is null
> at org.apache.felix.log.Log.serviceChanged(Log.java:326)
> 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)
> {code}
>
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