javax.validation.ConstraintViolationException

Question

我使用的是JSF+JPA iam没有修复此错误：

javax.validation.ConstraintViolationException: Bean验证约束(S)在对回调事件执行自动Bean验证时被违反：‘prePersist’。有关详细信息，请参阅嵌入式ConstraintViolations。

@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

要知道是什么导致了约束冲突，您可以使用以下验证器和记录器。

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());
  }
}

将记录器放在持久化实体之前。所以在

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

编译并运行。控制台将在异常堆栈跟踪之前向您显示是哪个元素导致了违规。

您可以但是应该使用ConstraintViolationException捕获包含任何持久性方法的try块(以避免进一步的问题和/或通知用户发生错误及其原因)。但是，在构建良好的系统中，在持久化期间不应该出现任何违反约束的异常。在JSF和其他MVC框架中，在提交/持久性之前，验证步骤必须全部或部分在客户端完成。我会说这是个很好的做法。

Answer 2

这是另一种方式，从正确的回答苏扬西瓦古鲁纳坦，我写没有在评论，因为我没有50声誉。

如果您让AbstractFacade.java在create方法上写这个

public void create(T entity) {        
    ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
    javax.validation.Validator validator = factory.getValidator();
    Set<ConstraintViolation<T>> constraintViolations = validator.validate(entity);
    if (constraintViolations.size() > 0 ) { 
       System.out.println("Constraint Violations occurred.."); 
       for (ConstraintViolation<T> contraints : constraintViolations) {
            System.out.println(contraints.getRootBeanClass().getSimpleName()+
            "." + contraints.getPropertyPath() + " " + contraints.getMessage());
        }        
        getEntityManager().persist(entity);              
    }
}