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https://issues.apache.org/jira/browse/WW-5496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17916272#comment-17916272
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Erica Kane commented on WW-5496:
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Looks like Tomcat 11 is an Alpha release, not Stable, so that likely explains
some of the issues. We are going with Tomcat 10.1 instead. Thank you very much
for your help [~guenterpaul] in steering me in the right direction!
> Struts filter and HttpServletResponseWrapper
> --------------------------------------------
>
> Key: WW-5496
> URL: https://issues.apache.org/jira/browse/WW-5496
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 7.0.0
> Reporter: Günter Paul
> Priority: Minor
> Fix For: 7.1.0
>
>
> I've been using a servlet filter for a long time. It removes spaces in the
> lines (trim()) and line breaks (only for *.action requests).
> The filter is installed in the web.xml before the struts filter. It works
> very well so far, even with the current Struts 7.0.0-M10 version.
> Until now I was using Tomcat 10. After switching to Tomcat 11, only blank
> pages are displayed.
> If I use a web-application without struts, the filter works fine. Only when
> the Struts filter (StrutsPrepareAndExecuteFilter) is installed does the
> output of the wrapper appear to no longer be included in the output stream.
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