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Re: How more than one XA Datasources participate in one container managed transaction ?
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created by <a href="https://community.jboss.org/people/wdfink">Wolf-Dieter Fink</a> in <i>Datasource Configuration</i> - <a href="https://community.jboss.org/message/783314#783314">View the full discussion</a>
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<div class="jive-rendered-content"><p>If you use CMT the container will track which resource is involved in the transaction.</p><p>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.</p><p>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).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So a Tx is committed if you return from a method with a different Tx scope, let me shown an example:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Method1 (Tx.Required)</p><p>   do DB stuff</p><p>  -> M2 (Tx.NotSupported)</p><p>      Tx1 suspended</p><p>   -> M3 (Tx.Required)</p><p>        Tx2</p><p>       do DB stuff maybe different DB'S</p><p>       return</p><p>   <-  (prepare)commit Tx2</p><p>   <-</p><p><-</p><p> (prepare)commit Tx1</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The commits are done by the container outside your code (also outside the interceptors)</p><p>There is no configuration to control that.</p></div>
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