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https://issues.apache.org/jira/browse/LOG4J2-1025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14555781#comment-14555781
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Mikael Ståldal commented on LOG4J2-1025:
----------------------------------------
In any case, I would suggest to add a null check in
{{org.apache.logging.log4j.jul.LevelTranslator#toLevel()}} to make sure we
never pass along any log event with {{null}} level.
> Custom java.util.logging.Level gives null Log4j Level
> -----------------------------------------------------
>
> Key: LOG4J2-1025
> URL: https://issues.apache.org/jira/browse/LOG4J2-1025
> Project: Log4j 2
> Issue Type: Bug
> Components: JUL adapter
> Affects Versions: 2.3
> Reporter: Mikael Ståldal
>
> I use a 3rd party library which uses custom non-standard
> java.util.logging.Level.
> The Log4j JUL adapter will emit log event with level set to null in that
> case, which causes NullPointerException in a Log4j filter further on.
> This is not acceptable. When encountering an unrecognised JUL Level, the JUL
> adapter should either:
> - emit some default Log4j Level
> - throw an Exception with a clear error message immediately
> - silently discard the log event
> - discard the log event and log a warning to the StatusLogger
> {code}
> java.lang.NullPointerException
> at org.apache.logging.log4j.Level.isMoreSpecificThan(Level.java:163)
> at
> org.apache.logging.log4j.core.filter.BurstFilter.filter(BurstFilter.java:129)
> at
> org.apache.logging.log4j.core.filter.BurstFilter.filter(BurstFilter.java:101)
> at
> org.apache.logging.log4j.core.Logger$PrivateConfig.filter(Logger.java:295)
> at org.apache.logging.log4j.core.Logger.isEnabled(Logger.java:122)
> at
> org.apache.logging.log4j.spi.ExtendedLoggerWrapper.isEnabled(ExtendedLoggerWrapper.java:87)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:699)
> at
> org.apache.logging.log4j.jul.WrappedLogger.log(WrappedLogger.java:50)
> at org.apache.logging.log4j.jul.ApiLogger.log(ApiLogger.java:106)
> {code}
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