Hi, am facing the very same exception, i tried changing the parameter you specifed as well. But am using JBOSS 4.2, so the jboss-service.xml said the block of code you specified is inactive and asked me to use the below lines of code instead. | <mbean code="com.arjuna.ats.jbossatx.jta.TransactionManagerService" | name="jboss:service=TransactionManager"> | <attribute name="TransactionTimeout">3000000</attribute> | <attribute name="ObjectStoreDir">${jboss.server.data.dir}/tx-object-store</attribute> | </mbean> | Also i canged the transaction timed out from 300 to a very huge value. Still the issue persist. Can you kindly advice me to get this issue resolved. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211563#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...