Raman Gupta created LOG4J2-1618:
-----------------------------------

             Summary: JVM shutdown fails with ClassCastException on 
SimpleLogger to Logger
                 Key: LOG4J2-1618
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1618
             Project: Log4j 2
          Issue Type: Bug
          Components: Core
    Affects Versions: 2.6.2
            Reporter: Raman Gupta


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

```
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 bundle, not 
`org.apache.logging.log4j.core.Logger`.




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