[ 
http://jira.magnolia-cms.com/browse/MAGNOLIA-2989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=27666#action_27666
 ] 

Hudson CI server commented on MAGNOLIA-2989:
--------------------------------------------

Integrated in !http://hudson.magnolia-cms.com/nocacheImages/16x16/blue.gif! 
[magnolia_main-4.0-branch 
#76|http://hudson.magnolia-cms.com/job/magnolia_main-4.0-branch/76/]
     merging r33320 from trunk: MAGNOLIA-2989: patch applied, thanks to Joshua 
Portway ! Only bother to write anything to the output stream if there's 
something to write (length of response >0)


> GZipFilter causes "getWriter() has already been called for this response" 
> error to be thrown on Glassfish v3
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: MAGNOLIA-2989
>                 URL: http://jira.magnolia-cms.com/browse/MAGNOLIA-2989
>             Project: Magnolia
>          Issue Type: Bug
>          Components: admininterface, cache, core
>    Affects Versions: 4.2.3
>            Reporter: joshua portway
>            Assignee: Grégory Joseph
>             Fix For: 4.3.x
>
>         Attachments: MAGNOLIA-2989-stracktrace.txt, 
> NetBeansScreenSnapz001.png, screenshot-2.jpg, 
> vcs-diff7973054169198951414.patch
>
>   Original Estimate: 0d
>  Remaining Estimate: 0d
>
> Immediately after logging in this error is thrown by the server, and the 
> admin page never renders.
> This means that magnolia is effectively completely unusable under Glassfish 
> v3.
> This has been a problem in previous version of glassfish, and with previous 
> versions of Magnolia (going back to at least 3.5, probably earlier, but I 
> can't remember), but in previous version of glassfish the problem only caused 
> a warning to be logged. Glassfish version 3 treats this as a fatal error and 
> aborts rendering the page.
> With previous versions of Magnolia running under glassfish 2.5 (such as sites 
> I currently have running) it's only the admin interface that causes this 
> problem - rendering normal pages does not cause a warning to be logged.
> here's the stack trace :
> {noformat}
> java.lang.IllegalStateException: PWC3990: getWriter() has already been called 
> for this response
>        at 
> org.apache.catalina.connector.Response.getOutputStream(Response.java:676)
>        at 
> org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:205)
>        at 
> info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:106)
>        at 
> info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:62)
> [...]
> {noformat}

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