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https://issues.apache.org/jira/browse/FELIX-3334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201617#comment-13201617
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J.W. Janssen commented on FELIX-3334:
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@Felix: you're right; I was too early with my conclusion. The spec clearly says
that bundles are to be unregistered automatically as listeners after being
stopped.
We actually do encounter the NPE, but we're running multiple instances of the
PreferenceService to provide this service in a multi-tenant situation. That
said, we also encountered situations that the original fix did not fix the
problem either. So, I've changed the code to test for null, which does resolve
the issue for our situation.
> 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-new.patch, 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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