javax.validation.ConstraintViolationException

Question

Sto usando JSF + APP iam non correggere questo errore:

javax.validation.ConstraintViolationException: Bean Validation constraint(s) violated while executing Automatic Bean Validation on callback event:'prePersist'. Please refer to embedded ConstraintViolations for details.

@ManagedBean(name = "clientCon") 
public class ClientController { 

    @PostConstruct 
    public void init() { 
     System.out.println("Salam"); 
     clients = new Clients(); 
    } 

    private EntityManagerFactory emf = null; 

    public ClientController() { 
     emf = Persistence.createEntityManagerFactory("ClinicProjectPU"); 
    } 

    private List<Clients> clientList; 
    private Clients clients; 

    public EntityManager getEntityManager() { 
     return emf.createEntityManager(); 
    } 

    public Clients getClients() { 
     return clients; 
    } 

    public void setClients(Clients clients) { 
     this.clients = clients; 
    } 

    public List<Clients> getClientList() { 
     this.clientList = getEntityManager().createNamedQuery("Clients.findAll").getResultList(); 
     return clientList; 
    } 

    public void createClient() { 
     EntityManager em = null; 
     try { 
      em = getEntityManager(); 
      em.getTransaction().begin(); 
      em.persist(clients); // the only interesting method 
      em.flush(); 
      em.getTransaction().commit(); 
      System.out.println("created"); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } finally { 
      if (em != null) { 
       em.close(); 
      } 
     } 
    } 
} 

---

<h:form> 
    <fieldset> 
     <h:panelGrid columns="2"> 
      <h:outputText value="Ad" style="color: #0099cc"/> 
      <h:inputText class="form-client" value="#{clientCon.clients.name}" /> 
      <h:outputText value="Soyad" style="color: #0099cc" /> 
      <h:inputText class="form-client" value="#{clientCon.clients.surname}" /> 
      <h:outputText value="Telefon" style="color: #0099cc" /> 
      <h:inputText class="form-client" value="#{clientCon.clients.phone}" /> 
     </h:panelGrid> 

     <div class="btns"> 
      <center><h:commandButton action="#{clientCon.createClient()}" value="Saxla" style="width: 60%;margin-top: 5%;border-radius: 5px;color: #ffffff;background-color: #0099cc" /></center> 
     </div> 
    </fieldset> 
</h:form> 

---

javax.validation.ConstraintViolationException: Bean Validation constraint(s) violated while executing Automatic Bean Validation on callback event:'prePersist'. Please refer to embedded ConstraintViolations for details. 
    at org.eclipse.persistence.internal.jpa.metadata.listeners.BeanValidationListener.validateOnCallbackEvent(BeanValidationListener.java:90) 
    at org.eclipse.persistence.internal.jpa.metadata.listeners.BeanValidationListener.prePersist(BeanValidationListener.java:62) 
    at org.eclipse.persistence.descriptors.DescriptorEventManager.notifyListener(DescriptorEventManager.java:748) 
    at org.eclipse.persistence.descriptors.DescriptorEventManager.notifyEJB30Listeners(DescriptorEventManager.java:691) 
    at org.eclipse.persistence.descriptors.DescriptorEventManager.executeEvent(DescriptorEventManager.java:229) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectClone(UnitOfWorkImpl.java:4310) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNotRegisteredNewObjectForPersist(UnitOfWorkImpl.java:4287) 
    at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.registerNotRegisteredNewObjectForPersist(RepeatableWriteUnitOfWork.java:518) 
    at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4229) 
    at org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:496) 
    at controller.ClientController.createClient(ClientController.java:69) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at javax.el.ELUtil.invokeMethod(ELUtil.java:326) 
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:536) 
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256) 
    at com.sun.el.parser.AstValue.invoke(AstValue.java:269) 
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304) 
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) 
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87) 
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) 
    at javax.faces.component.UICommand.broadcast(UICommand.java:315) 
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790) 
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282) 
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646) 
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) 
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734) 
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673) 
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174) 
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260) 
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188) 
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191) 
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168) 
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189) 
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136) 
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114) 
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77) 
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838) 
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55) 
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564) 
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544) 
    at java.lang.Thread.run(Thread.java:724) 

Answer 1

di sapere che cosa ha causato la violazione del vincolo, puoi usare il seguente validatore e logger.

ValidatorFactory factory = Validation.buildDefaultValidatorFactory(); 
Validator validator = factory.getValidator(); 

Set<ConstraintViolation<Clients>> constraintViolations = validator.validate(clients); 

if (constraintViolations.size() > 0) { 
System.out.println("Constraint Violations occurred.."); 
for (ConstraintViolation<Clients> contraints : constraintViolations) { 
System.out.println(contraints.getRootBeanClass().getSimpleName()+ 
"." + contraints.getPropertyPath() + " " + contraints.getMessage()); 
    } 
} 

Inserire il logger prima di mantenere l'entità. Così tra

em.getTransaction().begin(); 
//here goes the validator 
em.persist(clients); 

compilare ed eseguire. La console mostrerà, appena prima della traccia dello stack di eccezioni, quale elemento (i) ha causato la/e violazione/i.

È possibile, ma si dovrebbe prendere il blocco try contenente qualsiasi metodo di persistenza con ConstraintViolationException (per evitare ulteriori problemi e/o informare l'utente si è verificato un errore e la sua ragione). Tuttavia, in un sistema ben costruito non ci dovrebbero essere eccezioni di violazione dei vincoli durante la persistenza. In JSF e in altri framework MVC, la fase di validazione deve essere eseguita totalmente o parzialmente dal lato client prima di submit/persistence. Questa è una buona pratica, direi.