Hello, i have a Seam app for Seam 1.2.1 and JBoss 4.0.5 GA which uses 2 persistent uinits. After migrating this app to SEAM 2.0.0Beta1 and JBoss 4.2.0GA i get an exception when both persistance units are used. The experiment comes from one database and after that a query to the other db should be executed, but raises this exception. 16:17:17,890 INFO [STDOUT] Hibernate: select experiment0_.ExperimentID as Experime1_76_, experiment0_.Size as Size76_, experiment0_.SowingYear as SowingYear76_, experiment0_.Description as Descript4_76_, experiment0_.HarvestYear as HarvestY5_76_, experiment0_.SowingDate as SowingDate76_, experiment0_.AddressCode as AddressC7_76_, experiment0_.AddressFAOCode as AddressF8_76_, experiment0_.PartnerCode as PartnerC9_76_, experiment0_.ProjectCode as Project10_76_, experiment0_.ExperimentCode as Experim11_76_, experiment0_.ExperimentName as Experim12_76_, experiment0_.SiteID as SiteID76_, experiment0_.HarvestDate as Harvest14_76_, experiment0_.Design as Design76_, experiment0_.Samples as Samples76_, experiment0_.Replications as Replica17_76_ from EXPERIMENT experiment0_ limit ? | 16:17:17,984 WARN [loggerI18N] [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] [com.arjuna.ats.internal.jta.transaction.arjunacore.lastResource.disallow] Adding multiple last resources is disallowed. Current resource is org.jboss.resource.connectionmanager.TxConnectionManager$LocalXAResource@1340091 | 16:17:18,000 WARN [JDBCExceptionReporter] SQL Error: 0, SQLState: null | 16:17:18,000 ERROR [JDBCExceptionReporter] Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: -53e0d9e7:77e:469b7d96:41 status: ActionStatus.ABORT_ONLY >); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: -53e0d9e7:77e:469b7d96:41 status: ActionStatus.ABORT_ONLY >)) | 16:17:18,000 FATAL [application] javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection | javax.faces.el.EvaluationException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection | at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:91) | at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:91) | at javax.faces.component.UICommand.broadcast(UICommand.java:383) | Both connections are working. I can access each database in isolated state. But not the two togehter. It would be fine if someone has an idea what this error means. Any pointer (even it is a pointer to the right forum to ask: hibernate,EJB3,JCA etc) are welcome. Googling yield only this link:http://lists.jboss.org/pipermail/jboss-svn-commits/2007-March/006849... and was not helpful Ciao, Carsten View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064581#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...