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https://issues.apache.org/jira/browse/LOG4J2-1873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962930#comment-15962930
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Matt Sicker commented on LOG4J2-1873:
-------------------------------------

I'd be interested in seeing this feature myself. The standard UTF-8 
CharsetEncoder is ridiculous in this regard.

> 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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