For a <tx-connection-factory> with <xa-transaction/> but without <track-connection-by-tx/>, does obtaining a connection handle within an application component acquire an exclusive lock on the underlying managed connection? Is it possible to have multiple concurrent transactions all holding open handles to the same managed connection with transaction interleaving facilitating the context switching between them? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4123072#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...