(adsbygoogle = window.adsbygoogle || []).push({}); 如何解決Hibernate Validator異常“找不到類型為java.lang.String的驗證器”？

您將放置@ActorConstraint到name類型為的字段中String，而驗證器類型使用設置了ActorConstraintValidator參數Actor。也就是說，沒有@ActorConstraint約束和類型的驗證器String。

解決方法

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

我想添加我的自定義約束驗證器，但似乎未調用我的驗證器，并且總是收到“找不到類型的驗證器”異常。我有沒有犯錯？我總是遇到這個異常的大問題

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，如果我刪除了自定義約束驗證器，一切都會很好。這是我的代碼，您能幫忙找到導致此異常的原因嗎？

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@Componentpublic 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; ... }

特別說明，我已添加

<bean />

彈簧xml