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https://issues.apache.org/jira/browse/LOG4J2-2537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756677#comment-16756677
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Ralph Goers commented on LOG4J2-2537:
-------------------------------------
If you are getting this message then your application is not setup to use
multi-release jars. Log4j supports Java 9+ by using Stackwalker in a version of
StackLocator that is located in META-INF/versions/9. Depending on how your
application works, you may need to have Multi-Release set to true in the jar
manifest. This is true for Spring Boot jars. Without multi-release support you
will use the pre-Java 9 version of StackLocator which tries to use
Reflection.getCallerClass(). That class was removed in Java 9. Log4j will fall
back to a slower way to calculate stack locations but it will still work. Hence
the warning.
> Log4j 2 Performance issue with Java 11
> --------------------------------------
>
> Key: LOG4J2-2537
> URL: https://issues.apache.org/jira/browse/LOG4J2-2537
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.11.0
> Reporter: Suraj Menon
> Priority: Minor
>
> Log4j shows the following warning when running with Java 11. No such warnings
> were shown when running with Java 8.
> {noformat}
> WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will
> impact performance.{noformat}
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