When you say JBoss crashes, do you actually mean the java.exe process is killed?
As for this exception:
anonymous wrote : 2008-09-04 16:14:11,559 INFO [STDOUT] Caused by:
javax.resource.ResourceException: No ManagedConnections available within configured
blocking timeout ( 30000 [ms] )
See this wiki
http://wiki.jboss.org/wiki/WhatDoesTheMessageNoManagedConnectionsAvailabl...
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