Ralph Goers commented on LOG4J2-2281:

Log4j does not require Java 9. Log4j supports Java 9. It does this by making 
the jar a multi-release jar and putting Java 9 classes under 
META-INF/versions/9 where they should be ignored by anything pre-Java 9. 
However, as we have found out, there are several tools that are looking for 
class files anywhere they appear in a jar, even if they are not under a 
directory where the ClassLoader can find them.

> Version 2.10 on IBM WebSphere 9
> -------------------------------
>                 Key: LOG4J2-2281
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2281
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Core
>    Affects Versions: 2.10.0
>         Environment: Tested on WebSphere 8.5 and 9.0 on Windows and z/OS
>            Reporter: Philipp Schneider
>            Priority: Blocker
>         Attachments: log4j2-2-10-on-was9.txt
> The new Log4J2 version 2.10.0 creates some really weird issues on WebSphere.
> It might be related to the split of the server components into the unreleased 
> tools project(LOG4J2-2064).
> I have attached the stacktrace of a WebSphere 9 instance on Windows 7. I hope 
> you can get anything out of it.
> It even crashes the server sometimes when I am trying to deploy from Eclipse, 
> but this might be related to the bad quality of the Eclipse plugin by IBM.

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