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https://issues.apache.org/jira/browse/LOG4J2-2005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16137284#comment-16137284
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Gary Gregory commented on LOG4J2-2005:
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Hm..., to avoid breaking existing configs we could go the other way by
converting custom level names to upper case.
> Level.valueOf() converts level strings to uppercase
> ---------------------------------------------------
>
> Key: LOG4J2-2005
> URL: https://issues.apache.org/jira/browse/LOG4J2-2005
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.8.2
> Reporter: Paul Burrowes
>
> When using custom levels that are not all uppercase the serialized level
> strings are not deserializable back into levels because Level.valueOf()
> assumes all levels will be uppercase.
> https://logging.apache.org/log4j/2.x/manual/customloglevels.html says that
> levels are case sensitive and the convention is to use uppercase. Having the
> convention mandatory in code breaks all cases where the level name has
> already been standardised as mixed case.
> The fix is simple, Level.valueOf() should not convert levelName to uppercase.
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