It looks like the current WL holder and the RL requestor are not the same: | ... could not be acquired by <zzz:4256>:162303 ... | and | ... Write lock owner: Thread[ReportDataTaskRunner-20521017-1,5,jboss] ... | A thread dump would be very helpful. In addition, what transaction manager (if any) have you configured for JBoss Cache (the TransactionManagerLookup attribute in your JBoss Cache cfg xml)? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4062559#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...