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https://issues.apache.org/jira/browse/LOG4J2-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963050#comment-15963050
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Gary Gregory commented on LOG4J2-1873:
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ICU4J might have something we can optionally depend on or copy.
> Implement UTF-8 encoding that doesn't use CharsetEncoder
> --------------------------------------------------------
>
> Key: LOG4J2-1873
> URL: https://issues.apache.org/jira/browse/LOG4J2-1873
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Roman Leventov
>
> CharsetEncoder accepts only CharBuffers, and for the sake of being entirely
> garbage-free we don't want to use CharBuffer.wrap(stringBuilder), when
> encoding an event.
> That forces us to make additional data copy from StringBuilder to a
> thread-local CharBuffer.
> This could be avoided by implementing UTF-8 encoding logic in log4j-core
> itself, and not using CharsetEncoder.
> This issue is specifically about UTF-8 because it is used predominantly and
> it's relatively easy to implement. There are also likely some open-source
> Apache 2-compatible implementations in Java out there already that we could
> just copy and adapt.
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