It's not clear to me what's going on in the messages you log.  Apparently 
JGroups is reading a packet(s) with null data; that's what's causing the NPEs 
mentioned in the error messages.  Perhaps this is preventing the threads 
associated with the UDP protocol stopping properly.  But what the root issue is 
I don't know.

Can you try a more recent JGroups release? Basically any subsequent release is 
compatible with JBC 1.3.0.SP2, so I'd say try 2.4.1. (See 
http://labs.jboss.com/portal/jbosscache/compatibility/index.html for 
compatibility listings.)

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