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  1. Log4j 2
  2. LOG4J2-1618

ClassCastException at shutdown with JUL: casting SimpleLogger to Logger

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 2.6.2, 2.7
    • 2.7
    • Core
    • None
    • Important

    Description

      Apparently the fix for https://issues.apache.org/jira/browse/LOG4J2-1222 is causing a new issue when log4j-jul is enabled:

      2016-09-28 16:54:29,300 Thread-1 WARN Unable to register Log4j shutdown hook because JVM is shutting down. Using SimpleLogger
      Exception in thread "Thread-1" java.lang.ExceptionInInitializerError
      	at io.grpc.internal.SharedResourceHolder.releaseInternal(SharedResourceHolder.java:152)
      	at io.grpc.internal.SharedResourceHolder.release(SharedResourceHolder.java:112)
      	at io.grpc.internal.ServerImpl.shutdown(ServerImpl.java:182)
      	at io.grpc.internal.ServerImpl.shutdown(ServerImpl.java:79)
      	at com.rocketraman.Foo.stop(Foo.kt:39)
      	at java.lang.Thread.run(Thread.java:745)
      Caused by: java.lang.ClassCastException: org.apache.logging.log4j.simple.SimpleLogger cannot be cast to org.apache.logging.log4j.core.Logger
      	at org.apache.logging.log4j.jul.CoreLoggerAdapter.newLogger(CoreLoggerAdapter.java:37)
      	at org.apache.logging.log4j.jul.CoreLoggerAdapter.newLogger(CoreLoggerAdapter.java:31)
      	at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:48)
      	at org.apache.logging.log4j.jul.LogManager.getLogger(LogManager.java:89)
      	at java.util.logging.LogManager.demandLogger(LogManager.java:551)
      	at java.util.logging.Logger.demandLogger(Logger.java:455)
      	at java.util.logging.Logger.getLogger(Logger.java:502)
      	at io.grpc.internal.LogExceptionRunnable.<clinit>(LogExceptionRunnable.java:47)
      	... 7 more
      

      If I follow the chain of inheritance of `SimpleLogger`, the top-level interface is `org.apache.logging.log4j.Logger` from the -api jar, not `org.apache.logging.log4j.core.Logger` from the -core jar.

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            rpopma Remko Popma
            rocketraman Raman Gupta
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              Updated:
              Resolved:

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