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https://issues.apache.org/jira/browse/LOG4J2-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868839#comment-13868839
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Ralph Goers commented on LOG4J2-452:
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I have concerns that automatically starting Log4j 2 just due to the presence of
the jar is creating problems such as these.
> Log4j2 should not automatically start in Servlet 3.0
> ----------------------------------------------------
>
> Key: LOG4J2-452
> URL: https://issues.apache.org/jira/browse/LOG4J2-452
> Project: Log4j 2
> Issue Type: Bug
> Components: Filters
> Affects Versions: 2.0-beta9
> Reporter: Anthony Communier
> Priority: Critical
> Attachments: log4-servlet-test.zip, patch_async.diff
>
>
> When using async servlet (async-supported=true inweb.xml), log4j2 breaks the
> async chain because it does not support async. All element in the chain must
> support async in order to use async. Using Log4j2 in web context lead to be
> unable to use async.
> Be aware that async mecanism is more complicated than just intercept the
> chain before and after the handling of the request (thing that could be done
> in sync context). When using async mecanism web container threads can be used
> when the start method is invoked on AsyncContext and there are no way to
> intercept this systematically.
> So I m not sure that it's a good idea to automatically intercept request
> with a filter.
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