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https://issues.apache.org/jira/browse/LOG4J2-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13661501#comment-13661501
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Ralph Goers commented on LOG4J2-223:
------------------------------------
The web.xml in the sample application doesn't have the Log4jContextListener
registered. If it did the LoggerContext would have been unregistered when the
webapp was undeployed, the shutdown hook would have been removed, and the above
error would not have occurred.
It is hard to imagine what at line 170 could be causing the NPE, but I would
guess that the NullPointerException that Remko got above is because the webapp
has already been undeployed and the StatusLogger class isn't there any more.
If they had been deployed to the Tomcat class loader instead of the webapp
classloader then I suspect this error would not have occurred.
Removing the shutdown hook is not an appropriate solution. The configuration
really needs to be shutdown when the web app is undeployed or when the server
is shutdown, depending on where the log4j jars are placed, to clean up all the
resources.
> 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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