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https://issues.apache.org/jira/browse/LOG4J2-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Raman Gupta updated LOG4J2-1618:
--------------------------------
Affects Version/s: 2.7
> ClassCastException at shutdown with JUL: casting 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, 2.7
> Reporter: Raman Gupta
> Attachments: test-log4j2-1618.tar.gz
>
>
> Apparently the fix for https://issues.apache.org/jira/browse/LOG4J2-1222 is
> causing a new issue when log4j-jul is enabled:
> {noformat}
> 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
> {noformat}
> 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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