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https://issues.apache.org/jira/browse/LOG4J2-477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877394#comment-13877394
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Stefan Seifert commented on LOG4J2-477:
---------------------------------------

the same happens when using the the java.util.logging-to-slf4j bridge together 
with the slf4j-to-log4j bridge when trying to resolve the classloader of the 
latest stacktrace-element that does not belong to the slf4j-to-log4j bridge - 
its a class from java.util.logging which has not valid classloader attached.
the current trunk version fixes this problem as well.

> NPE in ClassLoaderContextSelector
> ---------------------------------
>
>                 Key: LOG4J2-477
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-477
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.0-beta9
>            Reporter: Tal Liron
>            Assignee: Remko Popma
>
> The problem is that some classes don't have class loaders: this can happen 
> when working with dynamic JVM languages (Rhino, Jython, etc.)
> Here's the stack trace I got:
> {code}
> java.lang.NullPointerException
>       at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:182)
>       at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:145)
>       at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:81)
>       at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:83)
>       at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:34)
> {code}



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