Now I'm able to see the Exception..the problem occurs when I try to register a user to a source that does not exist yet. The Exception throwed is: | javax.ejb.EJBTransactionRolledbackException: org.hibernate.HibernateException: this instance does not yet exist as a row in the database | [java] at org.jboss.ejb3.tx.Ejb3TxPolicy.handleInCallerTx(Ejb3TxPolicy.java:87) | [java] at org.jboss.aspects.tx.TxPolicy.invokeInCallerTx(TxPolicy.java:130) | [java] at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:195) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) | [java] at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:106) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) | [java] at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) | [java] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:214) | [java] at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:184) | [java] at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:81) | [java] at $Proxy203.createSources(Unknown Source) | [java] at nc.session.facade.admin.AdminSessionFacadeBean.addSourceToUser(AdminSessionFacadeBean.java:191) | I also found a patch to this...I entered this lines in the code: logger.debug("New Source (not found in Db): adding user to it"); | src=SourceAssembler.createSource(s); | logger.debug("Source created: "+src.getSourceId()+", "+src.getUrl()); | manager.persist(src); | manager.flush(); | list = new ArrayList<User>(); | list.add(user); | src.setUsers(list); | manager.persist(src); | However, why do I need to make the source persistent and synching with the database before adding user to it?? In all examples the persist method is called only once and without any flush!! Any suggest? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4107397#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...