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https://issues.apache.org/jira/browse/LOG4J2-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13661586#comment-13661586
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Ralph Goers commented on LOG4J2-223:
------------------------------------
See http://logging.apache.org/log4j/2.x/manual/architecture.html. Ceki does a
good job of explaining the Logback LoggerContext and ContextSelector in his
documentation. In particular look at
http://logback.qos.ch/manual/loggingSeparation.html#tamingStaticRefs.
The LoggerContext is the "anchor point" for all the logging. It references the
configuration.
The ClassLoaderContextSelector attempts to solve the problem Ceki described in
the Taming Static Refs section. It creates LoggerContexts based on the
ClassLoader that loaded the caller to getLogger. Thus, assuming the Log4j jars
are on the Tomcat classpath, loggers should be able to be declared as static
and still be cleaned up properly. I made this ContextSelector the default to
insure that it would get exposure and testing. I'm suspecting however, that
there is something that isn't being accounted for.
> IllegalStateException thrown during Tomcat shutdown
> ---------------------------------------------------
>
> Key: LOG4J2-223
> URL: https://issues.apache.org/jira/browse/LOG4J2-223
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0-beta5
> Reporter: Ralph Goers
> Priority: Critical
> Fix For: 2.0-beta7
>
> Attachments: log4j-223.war
>
>
> {noformat}Apr 25, 2013 3:03:33 PM org.apache.catalina.core.StandardServer
> await
> INFO: A valid shutdown command was received via the shutdown port. Stopping
> the Server instance.
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol pause
> INFO: Pausing ProtocolHandler ["http-nio-8080"]
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol pause
> INFO: Pausing ProtocolHandler ["ajp-nio-8009"]
> Apr 25, 2013 3:03:33 PM org.apache.catalina.core.StandardService stopInternal
> INFO: Stopping service Catalina
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol stop
> INFO: Stopping ProtocolHandler ["http-nio-8080"]
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol stop
> INFO: Stopping ProtocolHandler ["ajp-nio-8009"]
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol destroy
> INFO: Destroying ProtocolHandler ["http-nio-8080"]
> Apr 25, 2013 3:03:33 PM org.apache.coyote.AbstractProtocol destroy
> INFO: Destroying ProtocolHandler ["ajp-nio-8009"]
> Apr 25, 2013 3:03:33 PM org.apache.catalina.loader.WebappClassLoader loadClass
> INFO: Illegal access: this web application instance has been stopped already.
> Could not load org.apache.logging.log4j.core.config.NullConfiguration. The
> eventual following stack trace is caused by an error thrown for debugging
> purposes as well as to attempt to terminate the thread which caused the
> illegal access, and has no functional impact.
> java.lang.IllegalStateException
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1351)
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1310)
> at
> org.apache.logging.log4j.core.LoggerContext.stop(LoggerContext.java:171)
> at
> org.apache.logging.log4j.core.LoggerContext$ShutdownThread.run(LoggerContext.java:389)
> Exception in thread "Thread-18" java.lang.NoClassDefFoundError:
> org/apache/logging/log4j/core/config/NullConfiguration
> at
> org.apache.logging.log4j.core.LoggerContext.stop(LoggerContext.java:171)
> at
> org.apache.logging.log4j.core.LoggerContext$ShutdownThread.run(LoggerContext.java:389)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.logging.log4j.core.config.NullConfiguration
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1465)
> at
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1310)
> ... 2 more{noformat}
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