javax.validation：接收一个错误'无法找到类型的验证器：'

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验证来定义自定义约束@idmustexist。约束的目的是检查关联表中是否存在输入的ID值。我正在收到一个错误'javax.validation.neppedtypeexception：对于类型：com.mycompany.myapp.domain.package.package1.class1'都找不到验证器。

如果我将@idmustexist放在class1的字段定义上（如下示例代码中所述），则会收到上述错误。但是，如果我将@idmustexist约束放在字符串字段上，则不会收到上述错误。我的代码在idmustexistValidator.java中崩溃。我不明白为什么Hibernate可以找到“字符串”类的验证器，而不能找到域类“ Class1”。

我的班级定义如下。

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，此类设计具有错误）

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以验证 Serializable 值。也许 Class2 不是 Serializable?