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https://issues.apache.org/jira/browse/LOG4J2-493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13892531#comment-13892531
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Matt Sicker commented on LOG4J2-493:
------------------------------------

Could this be related to LOG4J-511?

> NPE in AsyncLogger.shutdown
> ---------------------------
>
>                 Key: LOG4J2-493
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-493
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0-beta9
>         Environment: tomcat 7.0.42
>            Reporter: Kireet Reddy
>
> When redeploying my application in tomcat multiple times, I get an exception:
> Exception in thread "Thread-29" java.lang.NullPointerException
>         at 
> org.apache.logging.log4j.core.async.AsyncLogger.stop(AsyncLogger.java:249)
>         at 
> org.apache.logging.log4j.core.async.AsyncLoggerContext.stop(AsyncLoggerContext.java:56)
>         at 
> org.apache.logging.log4j.core.LoggerContext$ShutdownThread.run(LoggerContext.java:437)
> This seems to be due to the fact that some initialization code happens in the 
> class initializer but is undone in the stop() method which is called during 
> webapp undeployment. This causes issues because in this case the log4j jar is 
> loaded by the shared classloader ($catalina.home/lib) rather than the webapp 
> classloader. This means the AsyncLogger class is not re-created during webapp 
> deployment. 
> I am using this structure because I have many 3rd party libraries and want to 
> keep redeployments lightweight. 



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