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https://issues.apache.org/jira/browse/LOG4J2-223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13661520#comment-13661520
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Remko Popma commented on LOG4J2-223:
------------------------------------

The listener did not go as smooth...

First, I removed the above BasicContextSelector.
Then, after deploying Nick's attached log4j-223.war, I 
modified\webapps\log4j-223\WEB-INF\web.xml as follows:
{code}
<web-app xmlns="http://java.sun.com/xml/ns/javaee";
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
           xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                               
http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd";
           version="3.1">

    <display-name>Logging Integration Application</display-name>

<!-- added listener -->
        <listener>
                
<listener-class>org.apache.logging.log4j.core.web.Log4jContextListener</listener-class>
        </listener>
...
{code}

I also had to add log4j-web-2.0-beta6.jar to WEB-INF/lib.

Undeploying gave the following (now familiar) error:
FAIL - Unable to delete [C:\apps\apache-tomcat-7.0.40\webapps\log4j-223]. The 
continued presence of this file may cause problems.

Under the webapps folder, this file was not deleted: 
webapps\log4j-223\WEB-INF\lib\log4j-core-2.0-beta6.jar
However, shutting down Tomcat with Ctrl-C did not give any errors.
                
> 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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