Hello, I'm new in EJB3 technology. I'm working with an entity bean that has a identity field, so i wrote this on the field declaration: @Id @Column(name = "codigo", nullable = false) @GeneratedValue(strategy=GenerationType.IDENTITY) private Long codigo; But, when the entity is persisted, Jboss warns me with a message : 16:42:52,947 WARN [WrappedConnection] Closing a result set you left open! Pleas e close it yourself. java.lang.Throwable: STACKTRACE at org.jboss.resource.adapter.jdbc.WrappedStatement.registerResultSet(Wr appedStatement.java:617) at org.jboss.resource.adapter.jdbc.WrappedStatement.getGeneratedKeys(Wra ppedStatement.java:533) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. ...... etc........... Why is this happening? Is something wrong in my code? Thank you very much for your help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4139787#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...