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https://issues.apache.org/struts/browse/WW-2062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_41696
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Nils-Helge Garli commented on WW-2062:
--------------------------------------

I'm pretty certain this is an uPortal issue. The reason you get different 
behaviour with the struts-bridge portlet is that it has expiration cache in 
portlet.xml set to -1, whereas the struts2 portlet has expiration cahce set to 
0, which means it doesn't cache anything. If you change expiration-cache in 
portlet.xml of the struts bridge portlet, you'll experience the same bug. It 
also happens with the other JSR168 portlet examples that comes with uPortal.

> Struts2 portlets window states vs uPortal portlal server
> --------------------------------------------------------
>
>                 Key: WW-2062
>                 URL: https://issues.apache.org/struts/browse/WW-2062
>             Project: Struts 2
>          Issue Type: Bug
>          Components: Portlet Integration
>    Affects Versions: 2.0.6
>         Environment: fedora core 5 , java 5, struts 2.0.6, uPortal 2.5.3
>            Reporter: tom
>            Assignee: Nils-Helge Garli
>
> Struts2 portlets on uPortal does not seem to handle the window states 
> properly.
> Other portlet development strategies  like struts bridge etc works fine on 
> uPortal,
> Already I got a modification in my portlet dispatcher class not to render 
> anything when the window state is MINIMIZED, recomended by Nils-Helge
> The behaviour is as follows, when I minmize a portlet, it get mimized, but 
> when I try to minimize another portlet that portlet get minimized but the 
> earlier portlet get expanded, it does not remain in the previous state, This 
> is the major bug
> We have not written any bridges to map between uPortal and S2, we thought we 
> dont need any but everything would work.
> Hope this is handled by struts 2

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