I have troubles with Persistence unit too: --- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM --- | ObjectName: jboss.jca:service=DataSourceBinding,name=DefaultDS | State: NOTYETINSTALLED | Depends On Me: | jboss.ejb:service=EJBTimerService,persistencePolicy=database | jboss.mq:service=StateManager | jboss.mq:service=PersistenceManager | | ObjectName: persistence.units:jar=ru.srpu.jtest.dao.jar,unitName=jtests | State: FAILED | Reason: org.hibernate.MappingException: Unable to find column with logical name: id in org.hibernate.mapping.Table(Test) and its related supertables and secondary tables | I Depend On: | jboss.jca:service=ManagedConnectionFactory,name=MySqlDS | Depends On Me: | jboss.j2ee:jar=ru.srpu.jtest.dao.jar,name=UserBean,service=EJB3 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3985308#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...