約束驗證

Question

我正在使用javax.validation.Validator以及基於註釋的驗證的相關類。

Configuration<?> configuration = Validation.byDefaultProvider().configure(); 
ValidatorFactory factory = configuration.buildValidatorFactory(); 
Validator validator = factory.getValidator(); 

Set<ConstraintViolation<ValidatableObject>> constraintViolations = validator.validate(o); 
for (ConstraintViolation<ValidatableObject> value : constraintViolations) { 
    List< Class< ? extends ConstraintValidator< ? extends Annotation,?>>> list = 
      value.getConstraintDescriptor().getConstraintValidatorClasses(); 
} 

我得到一個編譯錯誤，指出：

類型不匹配：不能從列表<類<轉換？將ConstraintValidator <捕獲＃4的？，？>>>擴展到列表<類<？擴展ConstraintValidator <？擴展註釋，？>>>

我錯過了什麼？

Answer 1

如果你不介意與ConstraintValidator<?, ?>正在（即你不需要ConstraintValidator<? extends Annotation, ?>），這應該工作：

Configuration<?> configuration = Validation.byDefaultProvider().configure(); 
ValidatorFactory factory = configuration.buildValidatorFactory(); 
Validator validator = factory.getValidator(); 

Set<ConstraintViolation<ValidatableObject>> constraintViolations = validator.validate(o); 
for (ConstraintViolation<ValidatableObject> value : constraintViolations) { 
    List< Class< ? extends ConstraintValidator<?,?>>> list = 
      value.getConstraintDescriptor().getConstraintValidatorClasses(); 
}