Wolf-Dieter Fink [https://community.jboss.org/people/wdfink] created the discussion "Re: How more than one XA Datasources participate in one container managed transaction ?" To view the discussion, visit: https://community.jboss.org/message/783314#783314 -------------------------------------------------------------- If you use CMT the container will track which resource is involved in the transaction. If the EJB is finished (mean that the business method return) the container will send a prepare to all XA resources and if successful a commit. It is the responsibility of the container how to do this. AFAIK JBoss will send prepare/commit in that order the resources are got from the container( but this might change with different versions). Also if you use different resources from an EJB, or a couple of EJB's, inside the same JBoss instance you do not need a JTS configuration. It will be more complex and might have performance drawbacks as it uses IIOP. So a Tx is committed if you return from a method with a different Tx scope, let me shown an example: Method1 (Tx.Required)    do DB stuff   -> M2 (Tx.NotSupported)       Tx1 suspended    -> M3 (Tx.Required)         Tx2        do DB stuff maybe different DB'S        return    <-  (prepare)commit Tx2    <- <- (prepare)commit Tx1 The commits are done by the container outside your code (also outside the interceptors) There is no configuration to control that. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/783314#783314] Start a new discussion in Datasource Configuration at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]