Integrate valuestack with EL 
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                 Key: WW-1913
                 URL: https://issues.apache.org/struts/browse/WW-1913
             Project: Struts 2
          Issue Type: Bug
          Components: Dispatch
    Affects Versions: 2.0.6
         Environment: tomcat5.5.17 , struts2.0.6
            Reporter: floyd.yao


When using '/*' as the FilterDispatcher mapping pattern,the FilterDispatcher.prepareDispatcherAndWrapRequest method will always prepares threadlocal dispatcher(got from Dispatcher.getInstance() in method prepareDispatcherAndWrapRequest )  for each request (including request like *.js,*.htm...) but never cleanup the threadlocal dispatcher like when action served, which result in the absence of wrapping to StrutsRequestWrapper after the first non-action mapping request. And the unwrapped request 's getAttribute will not findAttribute in valuestack ,the El collapse :(

I found two ways to solve this problem:
1. change the pattern from '/*' back to '*.do',and it works .(both Codebehind Plugin and zero configuration featrue of struts2 seem to work well in *.do pattern ,isnt it ?)
2. add ActionContextCleanUp filter before struts FilterDispatcher filter in web.xml ,thus it'll do cleanup for every request.(is it designed  to be used like this ? the guide said it delegate the cleanup action as used with Sitemesh)

So,Is there a need to move the 'ActionContextCleanUp.cleanUp(req);' to the outer try..finally block in class FilterDispatcher ?thus the '/*' pattern can also be  used with EL in jsp .

Is it a bug ? Any suggestion is appreciated :)


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