[jboss-jira] [JBoss JIRA] Created: (JGRP-715) NullPointerException after webapp is undeployed

[Stephen Wick (JIRA)]

NullPointerException after webapp is undeployed
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                 Key: JGRP-715
                 URL: http://jira.jboss.com/jira/browse/JGRP-715
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.2.8
         Environment: Tomcat 5.5, OSCache 2.4.1, JGroups 2.2.8, Log4j 1.2.13
            Reporter: Stephen Wick
         Assigned To: Bela Ban
            Priority: Critical
         Attachments: example.war

Tomcat (or any application server for that matter) becomes extremely unstable after undeploying/redeploying a webapp that uses OSCache and JGroups.

JGroups creates several Threads when the webapp is deployed, but it does not stop these Threads when the webapp is undeployed.  The Threads begin to throw all kinds of Exceptions including NullPointerExceptions after the application has been undeployed/redeployed a few times.  Eventually you have no choice but to KILL the tomcat process and start it over.  The log files also start filling up with all of the Exception stack traces, and performance slows to a halt.

I am attaching an example web application, example.war, which describes and exhibits the problem.

JGroups needs to be modified to shut down cleanly.  I'm not sure how or when this should happen.

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