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https://issues.apache.org/jira/browse/FELIX-6109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Guillaume Nodet resolved FELIX-6109.
------------------------------------
Resolution: Fixed
> NPE from null listener in DirectoryWatcher.findListener
> -------------------------------------------------------
>
> Key: FELIX-6109
> URL: https://issues.apache.org/jira/browse/FELIX-6109
> Project: Felix
> Issue Type: Bug
> Components: File Install
> Affects Versions: fileinstall-3.6.4
> Reporter: Stephen Marquard
> Assignee: Guillaume Nodet
> Priority: Major
> Fix For: fileinstall-3.6.6
>
>
> This error shows up intermittently in an OSGI application:
>
> {code}
> *ERROR* [org.osgi.service.cm.ManagedServiceFactory, id=13,
> bundle=6/file:/opt/ls/bundles/system/org.apache.felix.fileinstall-3.6.4.jar]:
> Unexpected problem updating configuration
> org.apache.felix.fileinstall.06a753e4-56fc-42fa-8a5b-c2b0b374581f
> java.lang.NullPointerException
> at
> org.apache.felix.fileinstall.internal.DirectoryWatcher.findListener(DirectoryWatcher.java:533)
> at
> org.apache.felix.fileinstall.internal.DirectoryWatcher.doProcess(DirectoryWatcher.java:460)
> at
> org.apache.felix.fileinstall.internal.DirectoryWatcher.process(DirectoryWatcher.java:365)
> at
> org.apache.felix.fileinstall.internal.DirectoryWatcher.start(DirectoryWatcher.java:247)
> at
> org.apache.felix.fileinstall.internal.FileInstall.updated(FileInstall.java:254)
> at
> org.apache.felix.fileinstall.internal.FileInstall$ConfigAdminSupport$Tracker.updated(FileInstall.java:378)
> at
> org.apache.felix.cm.impl.helper.ManagedServiceFactoryTracker.updated(ManagedServiceFactoryTracker.java:159)
> at
> org.apache.felix.cm.impl.helper.ManagedServiceFactoryTracker.provideConfiguration(ManagedServiceFactoryTracker.java:93)
> at
> org.apache.felix.cm.impl.ConfigurationManager$UpdateConfiguration.run(ConfigurationManager.java:1400)
> at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:138)
> at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:105)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>
> The NPE seems to imply that there is a null listener in the list of
> listeners here:
>
> {code:java}
> ArtifactListener findListener(File artifact, List<ArtifactListener>
> listeners)
> {
> for (ArtifactListener listener : listeners) {
> if (listener.canHandle(artifact)) {
> return listener;
> }
> }
> return null;
> {code}
>
> I don't know how that situation arises (some type of race condition, given
> that it's unpredictable), but seems like it should be easy enough to check
> for and ignore.
>
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