接收请求参数使用int类型的后果

@RestControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(value=com.swimming.basic.exception.NotNullException.class)

    @ExceptionHandler(value=javax.validation.ConstraintViolationException.class)
    public R NotNullHandler(ConstraintViolationException e) {
        Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
        Iterator<ConstraintViolation<?>> iterator = violations.iterator();
        StringBuffer message = new StringBuffer("");
        while (iterator.hasNext()) {
            message.append(iterator.next().getMessage());
        }
        return R.error().message(message.toString());
    }
  //...  
}

    @GetMapping("findById")
    public R findById(@NotNull(message = "id不能为空") int id){
        User user = userService.findById(id);
        return R.ok().data("user", user);
    }