Springboot: Content-Type 'multipart/form-data' is not supported

발생 상황

• multipart/formdata 콘텐트 타입으로 이미지를 요청 body에 받을 때 문제

org.springframework.web.HttpMediaTypeNotSupportedException: Content-Type 'multipart/form-data;boundary=----WebKitFormBoundaryAwYdPgnCGZSXBO1H;charset=UTF-8' is not supported
    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:209) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:163) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:136) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:122) ~[spring-web-6.0.11.jar:6.0.11]
    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:179) ~[spring-web-6.0.11.jar:6.0.11]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:146) ~[spring-web-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1081) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:974) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011) ~[spring-webmvc-6.0.11.jar:6.0.11]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.0.11.jar:6.0.11]

문제 파악

• @RequestBody 어노테이션을 그래도 놔두었기 때문에 문제가 되었던 사례입니다.
• Controller 에서 데이터를 받는 DTO 안에 MultipartFile을 추가하면서 수정해줘야하는 내용이 더 있는데 이부분을 저번에도 오류를 겪었으면서 오류를 반복했습니다 🥹
• @ModelAttibute로 어노테이션을 수정했고 (생략해도 문제 없는 것 같습니다.) 다음과 같이 코드를 수정했습니다.

    @PostMapping(value = "/join", consumes = {"multipart/form-data"})
    @ResponseStatus(HttpStatus.CREATED)
    public BaseResponse<Join.Response> signup(@Valid @ModelAttribute Join.Request request) throws MemberException, IOException { //TODO 핸드폰번호 인증 후 session 조회 추가
        Join.Response result = memberFacade.joinNewMember(request);
        return BaseResponse.send("회원가입에 성공하였습니다.", result);
    }

Refs.

• https://www.baeldung.com/sprint-boot-multipart-requests