Hi all. In my application i have two PersistenceUnits in Persistence.xml, two datasource configuration files: Datasource 1: <local-tx-datasource> <jndi-name>gekDatasource</jndi-name> <connection-url>jdbc:oracle:thin:@hp06a:1521:ddiv01</connection-url> <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> <user-name>mdbgekgen</user-name> mdbgekgen <min-pool-size>10</min-pool-size> <max-pool-size>50</max-pool-size> </local-tx-datasource> Datasource 2: datasources> <local-tx-datasource> <jndi-name>filevalDatasource</jndi-name> <connection-url>jdbc:oracle:thin:@hp06a:1521:ddiv01</connection-url> <driver-class>oracle.jdbc.driver.OracleDriver</driver-class> <user-name>fileval</user-name> fileval <min-pool-size>10</min-pool-size> <max-pool-size>50</max-pool-size> </local-tx-datasource> and... in runtime, i get the following exception: 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.TxConnectionMan esource@786b4f WARN [JDBCExceptionReporter] SQL Error: 0, SQLState: null 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: a550f09:1116:492d6371: tionStatus.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. t Imple < ac, BasicAction: a550f09:1116:492d6371:39 status: ActionStatus.ABORT_ONLY >)) ERROR [RetailoBatchLoadManagerBean] Failure Exception !! IOException: org.hibernate.exception.GenericJDBCException: Cannot open connection ERROR [RetailoBatchLoadManagerBean] [Ljava.lang.StackTraceElement;@5ba0d9 Any help greatly appreciated. Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4192508#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...