javax.validation:收到错误'找不到类型的验证器:'

Question

框架:JQuery,Spring,Hibernate,Hibernate Validator(JSR-303 Bean Validation)
平台:Windows

我正在尝试使用JSR 303-Bean验证定义自定义约束@IdMustExist.约束的目的是检查输入的id值是否存在于关联表中.我收到错误'javax.validation.UnexpectedTypeException:找不到类型为:com.mycompany.myapp.domain.package1.class1'的验证程序.

如果我将@IdMustExist放在Class1的字段定义上(如下面的示例代码所示),我收到上述错误.但是,如果我在String字段上放置@IdMustExist约束,我不会收到上述错误.我的代码在IdMustExistValidator.java中崩溃了.我不明白为什么Hibernate可以为'String'类找到Validator但不能为域类'Class1'找到.

我的课程定义如下.

Class2.java

@Entity
@Table
public class Class2 extends BaseEntity {
/**
 * Validation: Class1 Id must exist. 
 */ 
@ManyToOne
@JoinColumn(name="Class1Id")
@IdMustExist(entity=Class1.class)
private Class1 class1;

..

IdMustExist.java

@Required
@Target( { METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = IdMustExistValidator.class)
@Documented
@ReportAsSingleViolation
public @interface IdMustExist {
String message() default "{com.mycompany.myapp.domain.validation.constraints.idmustexist}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};

/**
 * The entity class that contains the id property.
 */
Class<?> entity();

/**
 * The property of the entity we want to validate for existence. Default value is "id"
 */
String idProperty() default "id";
}

IdMustExistValidator.java(请注意此类设计有错误)

public class IdMustExistValidator implements ConstraintValidator<IdMustExist, Serializable> {

/**
 * Retrieve the entity class name and id property name
 */
public void initialize(IdMustExist idMustExist) {
    if (idMustExist.entity() != null) 
        entity = idMustExist.entity();
    idProperty = idMustExist.idProperty();
}

/**
 * Retrieve the entity for the given entity class and id property.
 * If the entity is available return true else false
 */
public boolean isValid(Serializable property, ConstraintValidatorContext cvContext) {
    logger.debug("Property Class = {}", property.getClass().getName());
    logger.debug("Property = {}", property);
    List resultList = commonDao.getEntityById(entity.getName(), idProperty);
    return resultList != null && resultList.size() > 0;
}

private Class<?> entity;
private String idProperty;

@Autowired
private CommonDao commonDao;
private final Logger logger = LoggerFactory.getLogger(IdMustExistValidator.class);

}

Answer 1

您的约束验证器被声明为验证Serializable值。也许Class2不是Serializable？