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https://issues.apache.org/jira/browse/MYFACES-3119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027069#comment-13027069
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Matt Benson commented on MYFACES-3119:
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That's very possible, as Jakob himself called it an "ugly" patch. Without
being very familiar with the code, I just applied the patch that was available
to see if it worked for me.
> NullPointerException in
> UIComponentBase.restoreDeltaSystemEventListenerClassMap() when UIViewRoot
> subscribed to PostAddToViewEvent
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: MYFACES-3119
> URL: https://issues.apache.org/jira/browse/MYFACES-3119
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.0.5
> Reporter: Matt Benson
> Attachments: mf3119.patch.txt, mf3119.tar.gz, mf3119.tar.gz
>
>
> As reported in MYFACES-2466 (whose summary I copied here), I am encountering
> the NPE on the access of holderList in what is currently line 1917 of
> UIComponentBase whenever I use a ComponentSystemEventListener on UIViewRoot.
> Specifically I am subscribing to PreRenderViewEvent and the problem occurs
> restoring the view regardless of whether I unsubscribe the listener e.g.
> after RENDER_RESPONSE.
> More information:
> _systemEventListenerClassMap is null when the method is called, thus the map
> is reinstantiated so of course the value looked up and assigned to holderList
> is null.
> Now I have to go use Mojarra until this is fixed. :(
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