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https://issues.apache.org/jira/browse/LOG4J2-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718183#comment-14718183
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Mikael Ståldal commented on LOG4J2-1108:
----------------------------------------

According to 
[http://docs.oracle.com/javase/7/docs/api/java/util/logging/Logger.html], it is 
only in {{setLevel()}} you are allowed to pass null as Level, so we don't have 
to support null Level to the other methods in Logger (such as log(Level, ...)).

So I suggest we put the fix in {{CoreLogger.setLevel()}} and don't change 
{{DefaultLevelConverter}}.


> NullPointerException when passing null to java.util.logging.Logger.setLevel()
> -----------------------------------------------------------------------------
>
>                 Key: LOG4J2-1108
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1108
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: JUL adapter
>    Affects Versions: 2.4
>         Environment: 
> -Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager
>            Reporter: Mikael Ståldal
>            Priority: Blocker
>
> When using a 3rd party library (Twitter Finagle) which uses a custom 
> java.util.logging.Level, I get this:
> {code}
> Exception in thread "main" java.lang.NullPointerException
>         at 
> java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
>         at 
> java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:988)
>         at 
> org.apache.logging.log4j.jul.DefaultLevelConverter.toLevel(DefaultLevelConverter.java:119)
>         at 
> org.apache.logging.log4j.jul.LevelTranslator.toLevel(LevelTranslator.java:72)
>         at 
> org.apache.logging.log4j.jul.CoreLogger.setLevel(CoreLogger.java:47)
>         at com.twitter.logging.Logger.setLevel(Logger.scala:63)
> {code}



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