When I remove the old transaction from jboss-head, I'm seeing this error with JBossMessaging: | 18:08:12,510 ERROR [ExceptionUtil] org.jboss.messaging.core.jmx.JDBCPersistenceManagerService@18c3efb startService | java.lang.NoClassDefFoundError: org/jboss/tm/TransactionManagerServiceMBean | at org.jboss.messaging.core.jmx.JDBCServiceSupport.getTransactionManagerReference(JDBCServiceSupport.java:171) | at org.jboss.messaging.core.jmx.JDBCPersistenceManagerService.startService(JDBCPersistenceManagerService.java:84) | + one other | *** CONTEXTS IN ERROR: Name -> Error | | jboss.messaging:service=JMSUserManager -> java.lang.NoClassDefFoundError: org/jboss/tm/TransactionManagerServiceMBean | | jboss.messaging:service=PersistenceManager -> java.lang.NoClassDefFoundError: org/jboss/tm/TransactionManagerServiceMBean | The correct api to get the transaction manager is | TransactionManager tm = TransactionManagerLocator.getInstance().locate(); | for now I'm going to move this interface to the server project, but this needs fixing. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4094185#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...