约束验证

Question

我正在使用javax.validation.Validator以及基于注释的验证的相关类。

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(); 
} 

我得到一个编译错误，指出：

类型不匹配：不能从列表<类<转换？将ConstraintValidator <捕获＃4的？，？>>>扩展到列表<类<？扩展ConstraintValidator <？扩展注释，？>>>

我错过了什么？

Answer 1

如果你不介意与ConstraintValidator<?, ?>正在（即你不需要ConstraintValidator<? extends Annotation, ?>），这应该工作：

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(); 
}