Thunder Lei [http://community.jboss.org/people/Thunder.Farmer] created the discussion "JBoss 5.0 behavior of non-tx-datasource committed or NOT?" To view the discussion, visit: http://community.jboss.org/message/560360#560360 -------------------------------------------------------------- Hi there, When I look at the JBoss documents, there is a definition for non-tx-datasource, it said:" This element is used to specify the (org.jboss.resource.connectionmanager)NoTxConnectionManager service configuration. NoTxConnectionManager is a JCA connection manager with no transaction support. ". As my understanding to this definition, any changes made by using non-tx-datasource should NOT be committed into the underlying database, but according my investigation, that's NOT it. If non-tx-datasource works with xa-datasource, the both will commit or rollback. Could you guys pls give some clarification on this? What I did to verify non-tx-datasource behavior is: I have two session beans, ReadOnlyBean and XABean, which in turn refer to two JPA entity managers, and the entity managers refer to two datasouce, one is non-tx-datasource and xa-datasource. These two datasources are connecting different databases. I double checked the JDBC drivers used by these two datasources, one is xa and another is non xa. Then I have the third session bean FacadeBean. In one method of  this facade bean, I call ReadOnlyBean and XABean to update database. All the methods are given the transaction attribute as @TransactionAttribute(TransactionAttributeType.REQUIRED). I call ReadOnlyBean first, then call the XABean. If I throw EJBException in the XABean, seems both transactions are rolled back. If there is no EJBException, both changes are committed into underlying database. any comments are appreciated. Thanks&Regards, Thunder -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/560360#560360] Start a new discussion in Datasource Configuration at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]