java的validate工具方法

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public static <T> String validBean(T bean,Class<?>... groupClassz){
    Validator validator;
    try(ValidatorFacotry vf=Validation.buildDefaultValidatorFactory()){
         validator = vf.getValidator();
         Set<ConstraintViolation<T>> valid=validator.validate(bean,groupClassz);
         String errMsg=null;
         if(valid!=null){
           errMsg=valid.stream().map(ConstraintViolaation::getMessage).collect(Collectors.joining(","));
         }
         return errMsg;
    }

}