Question

框架：JQuery，Spring，Hibernate，Hibernate验证器（JSR-303 Bean验证）
平台：Windows

我正在尝试使用JSR 303-Bean Validation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（请注意此类设计存在错误）

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

声明您的约束验证器以验证Serializable值。也许Class2不是Serializable？

javax.validation：收到错误'找不到类型的验证器：'

1 个答案: