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https://issues.apache.org/jira/browse/LOG4J2-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13661488#comment-13661488
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Remko Popma commented on LOG4J2-223:
------------------------------------

The 500 error above is probably not related to Taglib. It also occurred after 
replacing the logging.jsp with a simple "Hello world" containing only HTML tags.

Not sure if this is related, but the console also shows this:
{code}
5 19, 2013 1:18:36 午後 org.apache.jasper.compiler.TldLocationsCache tldScanJar
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug 
logging for this logger for a complete list of JARs that were scanned
but no TLDs were found in them. Skipping unneeded JARs during scanning can 
improve startup time and JSP compilation time.
{code}
                
> IlliegalStateException 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
>
>
> 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

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