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https://issues.apache.org/struts/browse/WW-2523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=46118#action_46118
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Nils-Helge Garli commented on WW-2523:
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This might be related to
https://issues.apache.org/bugzilla/show_bug.cgi?id=37956
>From reading that, it seems there's a system property
>'org.apache.catalina.loader.WebappClassLoader.ENABLE_CLEAR_REFERENCES' that
>controls this behaviour. Try setting it to "false" and see if that makes any
>difference.
> 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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