@RequestBody와 @ModelAttribute

안녕하세요, 수업 잘 보고 있습니다.

저는 Controller에서 RequestMapping을 할 때 습관적으로 @ModelAttribute를 적어주는데요,

Client단에서 JSON으로 요청을 보냈을 때,

@RequestBody와 함께 @ModelAttribute를 적으면 제대로 바인딩이 안되는 경험을 했습니다.

@RequiredArgsConstructor
@RestController
public class NotificationController {

    private final NotificationService notificationService;
    private final NotificationDeleteRequestDtoValidator notificationDeleteRequestDtoValidator;

    @InitBinder("notificationDeleteRequestDto")
    public void initBinderForNotificationDeleteRequestDtoValidator(WebDataBinder webDataBinder){
        webDataBinder.addValidators(notificationDeleteRequestDtoValidator);
    }

    @PostMapping(NOTIFICATION_DELETE_URL)
    public ResponseEntity deleteNotification(@SessionAccount Account sessionAccount,
                                             @Valid @RequestBody @ModelAttribute NotificationDeleteRequestDto notificationDeleteRequestDto,
                                             Errors errors){
        if(errors.hasErrors()){
            return ResponseEntity.badRequest().build();
        }
        // notificationService.deleteNotification(sessionAccount, notificationDeleteRequestDto);
        return ResponseEntity.ok().build();
    }
}

이렇게 하면 바인딩이 안되어 null값으로 들어오고,

@RequiredArgsConstructor
@RestController
public class NotificationController {

    private final NotificationService notificationService;
    private final NotificationDeleteRequestDtoValidator notificationDeleteRequestDtoValidator;

    @InitBinder("notificationDeleteRequestDto")
    public void initBinderForNotificationDeleteRequestDtoValidator(WebDataBinder webDataBinder){
        webDataBinder.addValidators(notificationDeleteRequestDtoValidator);
    }

    @PostMapping(NOTIFICATION_DELETE_URL)
    public ResponseEntity deleteNotification(@SessionAccount Account sessionAccount,
                                             @Valid @RequestBody NotificationDeleteRequestDto notificationDeleteRequestDto,
                                             Errors errors){
        if(errors.hasErrors()){
            return ResponseEntity.badRequest().build();
        }
        // notificationService.deleteNotification(sessionAccount, notificationDeleteRequestDto);
        return ResponseEntity.ok().build();
    }
}

이렇게 하면 바인딩이 잘 되더군요..

@ModelAttribute는 @RequestBody와 같이 쓰면 안되는건가요 원래?

아니면 제가 뭔가 잘못한 게 있는건가요?