all'inizio ho provato senza settare code e dave errore di ejb ...mentre settanto code non da errore di ejb ma da errore di mapping con l'hineritans dovrei configurare i jpa bene a mano e non so farlo ....
cmq errore senza settare code è
codice:
INFO: file:/home/orphen/NetBeansProjects/GestioneRistorante/build/web/WEB-INF/classes/_GestioneRistorantePU login successful
AVVERTENZA: A system exception occurred during an invocation on EJB GestioneRistorante method public void server.GestioneRistorante.addOrdinabile(model.Piatto)
javax.ejb.EJBException
	at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5194)
	at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5092)
	at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4880)
	at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
	at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:222)
	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
	at $Proxy158.addOrdinabile(Unknown Source)
	at servlet.AggiungiPiatto.doPost(AggiungiPiatto.java:94)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
	at java.lang.Thread.run(Thread.java:662)
sn giunto alla conclusione che togliere questa hineritans e semplificaro il db in modo + semplice cosi nn avro problema anche se volevo imarare ad usare questa funzione molto potente