Hibernate验证器异常 "找不到适用于类型 java.lang.String 的验证器。"

Question

我使用Spring和Spring MVC 3.1，Hibernate 3，Hibernate Validator 4.3。

我想添加自定义约束验证器，但似乎我的验证器没有被调用，总是出现“找不到类型的验证器”的异常。我犯了什么错误吗？ 我一直遇到这个异常问题。

javax.validation.UnexpectedTypeException: HV000030: No validator could be found for type: java.lang.String.
    at org.hibernate.validator.internal.engine.ConstraintTree.verifyResolveWasUnique(ConstraintTree.java:394)
    at org.hibernate.validator.internal.engine.ConstraintTree.findMatchingValidatorClass(ConstraintTree.java:375)

但是如果我移除自定义的约束验证器，一切都能正常工作。以下是我的代码，请帮忙找出引起异常的源头？

test.constraint.ActorConstraint

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy=ActorConstraintValidator.class)
public @interface ActorConstraint {

  String message() default "Actor already exists in database";
  public abstract Class<?>[] groups() default {};
  public abstract Class<? extends Payload>[] payload() default {};

}



test.constraint.ActorConstraintValidator
@Component
public class ActorConstraintValidator implements ConstraintValidator<ActorConstraint, Actor> {

  @Autowired
  private ActorModel actorModel;

  @Override
  public void initialize(ActorConstraint arg0) {
    System.out.println("ActorConstraintValidator is initialized");
  }

  @Override
  public boolean isValid(Actor actor, ConstraintValidatorContext context) {

    boolean pass = true;

    if (getActorModel().isActorExist(actor.getName()) ){
      pass = false;
    }
    return pass;
  }


  public ActorModel getActorModel() {
    return actorModel;
  }

  public void setActorModel(ActorModel actorModel) {
    this.actorModel = actorModel;
  }  
}



test.entity.Actor

@Entity  /*(findByName named query definition is omitted)*/
public class Actor implements Serializable {

  public static final String NAMED_QUERY__FIND_ACTOR_BY_NAME = "findActorByName";

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @ActorConstraint
  @NotEmpty
  private String name;

  @DateTimeFormat(iso=ISO.DATE)
  private Date birthday;

  @Min(0)
  @Max(300)
  private Integer height;

  ...
 }

额外说明，我已经添加了

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>

转换为Spring XML

- Matt

Answer 1

您将@ActorConstraint放置在类型为String的字段name上，而验证器类型ActorConstraintValidator是用Actor参数化的。也就是说，没有适用于@ActorConstraint约束和String类型的验证器。

- Gunnar

---

谢谢Gunnar，我把ActorConstraintValidator参数改成了String，问题解决了。 - Matt