Encountered last problem too. Solved with adding the following to cache MBean XML:
jboss:service=ClientUserTransaction
View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3962711#3962711
Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3962711