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https://issues.apache.org/struts/browse/WW-2105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_41811
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Nils-Helge Garli commented on WW-2105:
--------------------------------------

It's most likely because the valuestack is stored between the event and render 
phase. This is to handle validation errors and cases where PRG is not properly 
used, for instance if an action uses the dispatch result with a JSP. I need to 
figure out for which scenarios this process can be skipped. If you're 
interested in where this happens, it's in the PortletStateInterceptor.

If you have time, can you attach an example configuration to reproduce the 
issue?

> Handle redirectAction result type in a portlet
> ----------------------------------------------
>
>                 Key: WW-2105
>                 URL: https://issues.apache.org/struts/browse/WW-2105
>             Project: Struts 2
>          Issue Type: Improvement
>          Components: Portlet Integration
>            Reporter: Nils-Helge Garli
>            Assignee: Nils-Helge Garli
>             Fix For: 2.1.0
>
>
> To ease migration of existing web application that use the redirect action 
> result type, this result type should point to PortletResult when running in a 
> portlet environment.

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