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https://issues.apache.org/jira/browse/LOG4J2-1?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13135081#comment-13135081
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Ralph Goers commented on LOG4J2-1:
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The experimental version of Log4J 2.0 doesn't use printStackTrace() to obtain
the stack. The ThrowableProxy is serialized when needed.
> Custom rendering of exception associated with logging event
> -----------------------------------------------------------
>
> Key: LOG4J2-1
> URL: https://issues.apache.org/jira/browse/LOG4J2-1
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Reporter: Curt Arnold
>
> In http://marc.info/?l=log4j-user&m=120898200413495&w=2, Robert Pepersack
> essentially asks for a method of overriding the use of
> Exception.printStackTrace() to capture the stack trace of the associated
> exception. This can partially be done in log4j 1.x by providing a custom
> layout that returns false for ignoresThrowable and then performs the
> rendering of the exception as part of the layout. However, it would not
> affect LoggingEvents that were deserialized. Also, if an AsyncAppender is
> used, the layout would be rendering an exception after it may have been
> modified.
> The log4j 2 pipeline should not have this issue as the extraction phase done
> by the layout should pull any info needed from the exception and the
> responsibility would not be split among WriterAppender, ThrowableInformation
> and the layout. So likely there is no additional design criteria involved
> here, just the final design should be checked that it satisfies this use case.
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