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https://issues.apache.org/struts/browse/WW-2523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44849#action_44849
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Torsten Krah commented on WW-2523:
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Yes this would be the best idea. JBoss is doing undeployment first for 
FilterDispatcher, so you have to patch Jsr168 one too ... that can't be the 
right solution.
However i don't know how to patch both so everyone got its own actual instance, 
if someone can provide me with some more details how it might be done, i might 
be able to write a patch.

> NPE in dispatcher cleanup when FilterDispatcher is used in a portlet
> --------------------------------------------------------------------
>
>                 Key: WW-2523
>                 URL: https://issues.apache.org/struts/browse/WW-2523
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Dispatch Filter, Plugin - Portlet
>    Affects Versions: 2.0.11, 2.1.0
>         Environment: JBoss Portal 2.6.4, Struts 2.1.1
>            Reporter: Nils-Helge Garli
>             Fix For: Future
>
>         Attachments: FilterDispatcher.diff, stackTrace_failure.txt, 
> stackTrace_ok.txt
>
>
> When the FilterDispatcher is configured in web.xml, it does cleanup first, 
> then JSR168Dispatcher does cleanup, and for some reason, the ThreadLocal 
> variable (the actual ThreadLocal variable, not the value it contain) is null. 
> I don't know if this is an issue only in JBoss.

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