Can you test it within JBoss and not as a standalone?
the topic
http://jboss.org/index.html?module=bb&op=viewtopic&t=100342
Is I think an example of the same problem
Ideas?
Please also see this jira:
http://jira.jboss.com/jira/browse/JBCACHE-946
for the how to rin PojoCache inside AS4.0.5.
This was contributed by a user previously so if you find anything that needs modified, please go ahead.