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https://issues.apache.org/jira/browse/WW-3770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13224449#comment-13224449
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Lukasz Lenart commented on WW-3770:
-----------------------------------
Please use the new filters [1] and [2], FilterDispatcher is deprecated
[1] http://struts.apache.org/2.x/docs/webxml.html
[2] http://struts.apache.org/2.x/docs/sitemesh-plugin.html
> NullPointerException instead of "There is no Action mapped for namespace..."
> (regression?)
> ------------------------------------------------------------------------------------------
>
> Key: WW-3770
> URL: https://issues.apache.org/jira/browse/WW-3770
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.3.1.2
> Reporter: Antoine W
>
> After upgrading to Struts 2.3.1.2, we get a Nullpointer when trying to access
> an undefined action (in example, /badurl.do) - see complete stack below.
> This is because ServletActionContext.getRequest() is NULL when
> getErrorMessage() gets called.
> This is a major issue because it prevents 404 error to be handled correctly
> and it affects several websites (just Google for
> "org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)")
> Edit: maybe is it due to the fact I'm using deprecated FilterDispatcher...
> java.lang.NullPointerException
>
> org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
>
> com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
>
> org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
>
> org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
>
> com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
>
> org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
>
> org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
> [my filter extends FilterDispatcher]
>
> com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
>
> com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
>
> org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:102)
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