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https://issues.apache.org/jira/browse/LOG4J2-1142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938933#comment-14938933
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Ralph Goers commented on LOG4J2-1142:
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Remko, Can you just create a pool in each PatternLayout and then have each call
to toSerializable remove it from the pool at the beginning and return it to the
pool at the end of the method? That doesn't require any knowledge of threads.
> ThreadLocals in Layout implementations should be non-static to prevent memory
> leaks in web containers
> -----------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-1142
> URL: https://issues.apache.org/jira/browse/LOG4J2-1142
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Affects Versions: 2.4
> Reporter: Dmitri Blinov
> Assignee: Remko Popma
> Fix For: 2.4.1
>
>
> As discussed in LOG4J2-1125, storing ThreadLocal<StringBuilder> in a static
> field may not interact well with the thread pools and class loaders of some
> web containers and may result in memory leaks, especially in older web
> containers.
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