1) Don't use autoreconnect anonymous wrote : | autoReconnect=true | This breaks transactions. A reconnect looses all the state. 2) Why are you defining a local-tx datasource then handling the transaction yourself? Looks very confused to me. no-tx-datasource perhaps if want to do everything yourself? 3) "thread" session context is just "broken" if you in an appserver/using JTA/CMT/BMT. It simply doesn't understand transaction demarcation (see the FAQ) and [url]http://www.hibernate.org/42.html[url] 4) You should also be using "AFTER_STATEMENT" release mode http://www.hibernate.org/hib_docs/reference/en/html/transactions.html since the appserver's connection manager already does the necessary caching of the connection and also understands when to (not) cache better than hibernate when crossing transaction boundaries. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4115040#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...