HI, I have also the same error and I don't know where the problem is... I am using netbeans 5.5 and i tried under jboss 4.0.4 and 4.0.5, the problem is always the same: 10:51:26,783 WARN [ServiceController] Problem starting service persistence.units:ear=EAW1.ear,jar=EAW1-ejb.jar,unitName=EAW1-ejbPU javax.naming.NameNotFoundException: mysql-EAW not bound --- MBeans waiting for other MBeans --- ObjectName: persistence.units:ear=EAW1.ear,jar=EAW1-ejb.jar,unitName=EAW1-ejbPU State: FAILED Reason: javax.naming.NameNotFoundException: mysql-EAW not bound I Depend On: jboss.jca:service=ManagedConnectionFactory,name=mysql-EAW The mysql-EAW is the name I gave to the data source when creating the persistence unit in netbeans 5.5. see here: http://imacx.ath.cx/img/eaw-mysql.jpg Thx for helping me View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4027116#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...