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https://issues.apache.org/struts/browse/WW-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43049#action_43049
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Nils-Helge Garli commented on WW-2240:
--------------------------------------
I have successfully reproduced the error with WebLogic. The problem is that a
nested FiterDispatcher invocation clears the ActionContext. I believe a short
term work-around would be to add the ActionContextCleanUp filter:
<filter>
<filter-name>struts-cleanup</filter-name>
<filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-cleanup</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
Add this first filter before the FilterDispatcher.
> FileUploadInterceptor causes null pointer exception
> ---------------------------------------------------
>
> Key: WW-2240
> URL: https://issues.apache.org/struts/browse/WW-2240
> Project: Struts 2
> Issue Type: Bug
> Components: Core Interceptors
> Affects Versions: 2.1.0
> Environment: WebLogic 10, Win XP
> Reporter: Benjamin McCann
> Fix For: 2.1.1
>
> Attachments: improvedLogging.patch, null context.jpg,
> TestAction.java, webtest.war
>
>
> Using struts2-core-2.1.0-SNAPSHOT-20071003.jar, I received the following:
> java.lang.NullPointerException
> at
> org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:277)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:229)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$1.doProfiling(DefaultActionInvocation.java:228)
> at
> com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:226)
> My action was able to access the File, so it must have been something in the
> cleanup. My action was very similar to the one found in this tutorial
> http://www.roseindia.net/struts/struts2/struts-2-file-upload.shtml
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