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https://issues.apache.org/jira/browse/FELIX-3334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197641#comment-13197641
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Felix Meschberger commented on FELIX-3334:
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A bundle being stopped is automatically unregistered as a bundle listener but
only after having called the stop method of the BundleActivator.
Looking at the code, chances are minimal (if there is a concurrency between
event handling and handling stop), but this would not be 100% solved by the
patch (because an event might still be coming in.
A better fix would be to check for the null-situation in the event handler when
accessing the store.
Did you actually encounter an NPE ?
> PreferencesManager can throw NPE after being stopped.
> -----------------------------------------------------
>
> Key: FELIX-3334
> URL: https://issues.apache.org/jira/browse/FELIX-3334
> Project: Felix
> Issue Type: Bug
> Components: Preferences Service
> Affects Versions: prefs-1.0.4
> Reporter: J.W. Janssen
> Labels: patch
> Attachments: quickfix.patch
>
>
> PreferencesManager#bundleChanged tries to intercept bundles that are
> uninstalled. However, if the PreferencesManager itself is stopped, it does
> not unregister itself as bundle listener, causing possible NPEs when other
> bundles depending on the preferences service are stopped later on, for
> example during a shutdown.
> I've got a patch available, will attach it to this issue to be applied.
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