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https://issues.apache.org/struts/browse/WW-2523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nils-Helge Garli resolved WW-2523.
----------------------------------

    Resolution: Won't Fix

Aparently, this is caused by Tomcat aggressively setting static fields to null 
when the context is stopped. This behaviour can be configured with the 
org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES system 
property. Setting it to 'false' prevents this error 
(-Dorg.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES=false).

> 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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