Still no joy on configuring a way to cleanup undeployed ws's

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Can anyone point me in the right direction for how to perform some 
cleanup code before my web service is undeployed?
It's a application based ws, and I currently start up various JMX 
MBeanServers within the web service, but even when it's undeployed, this 
dam thread keeps on running, and I have no
way to reference the object further, since it's in it's own little 
Tomcat classloader.

Can anyone help me?
Thanks