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https://issues.apache.org/jira/browse/TRINIDAD-2095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233478#comment-13233478
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Scott O'Bryan commented on TRINIDAD-2095:
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Thomas, I don't see this happening in the general case and I don't think that
the issue is as you say. I find it more likely that something in the filter
chain is causing a getWriter() to be executed while some other piece of
software (toplink?) tries to set the character encoding without checking to see
if the response has been committed. Bottom line is, the character encoding
cannot be set on a committed response as per J2EE.
Before we can even HOPE to make progress on this, we'll need a test case and
"maybe" we can either defer the call to getWriter() in the filterchain or
suggest that you file a bug against the framework that is trying to set this on
a committed response.
> Mojara and PWC4011: Unable to set request character encoding to UTF-8
> ---------------------------------------------------------------------
>
> Key: TRINIDAD-2095
> URL: https://issues.apache.org/jira/browse/TRINIDAD-2095
> Project: MyFaces Trinidad
> Issue Type: Bug
> Affects Versions: 1.2.14-core
> Reporter: Tomas Havelka
> Priority: Minor
>
> The problem with annoying warning message with Mojarra and Glassfish still
> remains.
> Within each request TrinidadFilterImpl creates the ServletExternalContext
> multiple times which causes Mojarra to log this message "PWC4011: Unable to
> set request character encoding to UTF-8" many many times (cca 4x per
> request). This causes the log file is getting large unreasonably. The problem
> is descibed in this thread
> http://www.mail-archive.com/dev@myfaces.apache.org/msg37786.html.
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