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https://issues.apache.org/jira/browse/LOG4J2-1025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14554378#comment-14554378
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Mikael Ståldal commented on LOG4J2-1025:
----------------------------------------
The documentation says:
bq. Using the default LevelConverter implementation, custom logging levels are
mapped to whatever the current level of the Logger being logged to is using.
but that does not seems to be the case.
> 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: 2.4
> 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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