JSF结合Bean验证:ConstraintViolationException



我尝试将JSF与Bean验证结合使用。基本上,一切都很好,验证工作如预期,我得到了正确的消息,但我的Glassfish控制台上有一个例外:

Warnung:   EJB5184:A system exception occurred during an invocation on EJB MyEntityFacade, method: public void com.mycompany.testbv.AbstractFacade.create(java.lang.Object)
Warnung:   javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
....
....
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:744)
Caused by: javax.validation.ConstraintViolationException: Bean Validation constraint(s) violated while executing Automatic Bean Validation on callback event:'prePersist'. Please refer to embedded ConstraintViolations for details.

如果使用自定义约束和预定义约束,则会出现此异常。

这是我的示例代码。

样本实体:

@Entity
@ValidEntity
public class MyEntity implements Serializable {
    private static final long serialVersionUID = 3104398374500914142L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @Size(min = 2)
    private String name;
    public MyEntity(String name) {
        this.name = name;
    }
    public MyEntity() {
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

自定义约束:

@Constraint(validatedBy = MyValidator.class)
@Target({FIELD, METHOD, TYPE})
@Retention(RUNTIME)
public @interface ValidEntity {
    String message() default "fail";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

自定义验证器:

public class MyValidator implements ConstraintValidator<ValidEntity, MyEntity>{
    @Override
    public void initialize(ValidEntity a) {
    }
    @Override
    public boolean isValid(MyEntity t, ConstraintValidatorContext cvc) {
        return false;
    }
}

样品控制器:

@Named
@SessionScoped
public class MyController implements Serializable {
    private static final long serialVersionUID = -6739023629679382999L;
    @Inject
    MyEntityFacade myEntityFacade;
    String text;
    public String getText() {
        return text;
    }
    public void setText(String text) {
        this.text = text;
    }
    public void saveNewEntity() {
        try {
            myEntityFacade.create(new MyEntity(text));
        } catch (Exception e) {
            Throwable t = e;
            while (t != null) {
                if (t instanceof ConstraintViolationException) {
                    FacesContext context = FacesContext.getCurrentInstance();
                    Set<ConstraintViolation<?>> constraintViolations = ((ConstraintViolationException) t).getConstraintViolations();
                    for (ConstraintViolation<?> constraintViolation : constraintViolations) {
                        FacesMessage facesMessage = new FacesMessage(constraintViolation.getMessage());
                        facesMessage.setSeverity(FacesMessage.SEVERITY_ERROR);
                        context.addMessage(null, facesMessage);
                    }
                }
                t = t.getCause();
            }
        }
    }
}

jsf页面示例:

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://xmlns.jcp.org/jsf/html">
    <h:head></h:head>
    <h:body>
        <h:form>
            <h:messages id="messages" />
            <h:inputText value="#{myController.text}" />
            <h:commandButton value="Save" action="#{myController.saveNewEntity()}" />
        </h:form>
    </h:body>
</html>

MyEntityFacade仅从实体管理器调用persistent。

如前所述,应用程序运行良好,正确的消息为shwon,但我希望在Glassfish控制台中避免出现此异常。

将persistence.xml中的验证模式设置为NONE是没有选择的,因为我想要一个验证。

我在2.2版本中使用JSF,实现是Mojarra。Bean Validation的版本是1.1,实现是Hibernate Validator。应用程序服务器是Glassfish 4.0。

类级约束不适用于JSF。看看这个答案。当您按下"保存"按钮时,JSF只检查名称是否至少有2个字符,并且不考虑ValidEntity约束。另一方面,JPA抱怨bean无效并抛出异常。

更新

1) @Size约束在MyEntity.name属性上,而在facelet中则具有MyController.text属性。从JSF的角度来看,没有什么可验证的。它根本不知道MyEntity。

2) ValidEntity总是无效的,因此即使在facelet中正确设置了MyEntity.name,JPA也总是抛出异常(除非禁用验证)。

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