zonedDateTime 직렬화 이슈(spring boot 1.x 버전)

Seungyeon Choi·2021년 6월 7일
@ResponseBodyLocalDateTimeSpringSpringbootdeserializejsonserializezonedDateTime데이터 직렬화
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배경

  • 업무 도메인 상 "시간"이란 개념을 다양하게 풀어내고 있음
  • spring boot 1.5.12 버전, jackson-datatype-jsr310 의존성이 추가된 상태
    • 미리 말하자면, 2.x 버전에서는 아래 문제 상관없음

문제 상황

  • api 서버를 만드는데, 클라이언트쪽으로 zonedDateTime 타입의 value가 굉장히 복잡하게 넘어옴. (뷰 뿌려줄 필요없으니 json 데이터만 넘겨줌)

    • 예를들어 서버에선 이런 친구가.....
    • 이렇게 직렬화가 되어 클라이언트로 넘어옴...,,
      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  • AS-IS
    위 이미지

  • TO-BE
    yyyy-MM-dd'T'HH:mm:ss'${timezone}' format 으로 출력 //UTC 로 출력할 예정이라 postfix가 Z지만 중요하지 않으므로 pass

    "2021-06-08T00:51:48.281+09:00"

해결법

ZonedDateTime 값이 ResponseEntity 에 담길 때 default로 설정된 직렬화 과정을 빼줌

방법1) @Configuration 파일 추가

@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
    	// 객체 converting 과정에 대해선 여기서 처리하면 됨
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        return objectMapper;
    }
}

방법2) application.properties/yml 에 설정 코드 추가

// properties
spring.jackson.serialization.write_dates_as_timestamps=false

// yml
spring.jackson.serialization.write-dates-as-timestamps: false

[번외] 왜 버전 2.x 에선 이런 문제가 없을까?
상위버전에서는 위 설정이 default로 false 처리 되어있음. 그래서 문제가 없다..
(더 자세한 내용은 여기 참고)

어떻게 해결법에 도달했나?

1. 구글링

키워드: "@restcontroller zoneddatetime response"

키워드 산출 근거
1. @restcontroller: 최종적으로 데이터를 반환하는 과정은 이 어노테이션과 연관있음
2. zoneddatetime: 이 타입의 객체가 제대로 전달이 안되고 있음....
3. response: 그냥...."응답결과"에 문제가 있는 것이니 그걸 나타내는 키워드.... 원하는 해결법을 담은 글에 한번쯤은 쓰일 것 같아서 넣었음...

스터디때 묻고싶은것: 여러분만의 구글링 팁이 있나요...?

이렇게 검색해서 여~러~가~지 링크가 나왔는데 아래 두개를 유심히 읽었다

친절한 링크
갓jojoldu님 링크

구글링을 통해 내린 결론

  • 데이터 직렬화? converting? 과정에서의 문제가 있다
  • 아 그럼 @restcontroller에서 http body에 담을 데이터converting을 어떻게 해주지?

2. @Restcontroller 가 어떻게 객체 데이터를 converting 하는가?


이미지 출처: https://wondongho.tistory.com/76

@RestController가 Data를 반환하기 위해서는 viewResolver 대신에 HttpMessageConverter가 동작합니다. HttpMessageConverter에는 여러 Converter가 등록되어 있고, 반환해야 하는 데이터에 따라 사용되는 Converter가 달라집니다. 단순 문자열인 경우에는 StringHttpMessageConverter가 사용되고, 객체인 경우에는 MappingJackson2HttpMessageConverter가 사용되며, 데이터 종류에 따라 서로 다른 MessageConverter가 작동하게 됩니다. Spring은 클라이언트의 HTTP Accept 헤더와 서버의 컨트롤러 반환 타입 정보 둘을 조합해 적합한 HttpMessageConverter를 선택하여 이를 처리합니다.

글 출처: https://mangkyu.tistory.com/49

이 과정을 통해 내린 결론

  • 아 ... MappingJackson2HttpMessageConverter가 default로 시간값들 converting 해주는 설정이 있겠군 => 근데 찾아보니까 converter에 붙는 object mapper 에 속한 설정에 문제가 있었음

3. converter 에 들어가는 object mapper custom 하기

3.1 POJO <-> json 변환 과정

  1. MappingJackson2HttpMessageConverter 클래스가 Spring Boot 초기 구동시 JacksonHttpMessageConvertersConfiguration 클래스에 의해 싱글턴 빈으로 등록되어 POJO-JSON간의 상호 변환을 수행한다.

  2. MappingJackson2HttpMessageConverter는 이름에서 보여지듯이 Java 진영에서 널리 쓰이는 JSON 라이브러리인 Jackson(Spring Boot 1.3.5 기준 Jackson 2.6 내장)을 사용하여 메시지를 상호 변환한다.

  3. MappingJackson2HttpMessageConverter는 HttpMessageConverter 인터페이스의 구현체로 read(), write() 메써드를 이용하여 JSON을 처리한다. 내부적으로는 Jackson이 제공하는 ObjectMapper 클래스를 사용하는데 커스텀 설정을 적용하여 미리 빈으로 등록해두면 변환시 자동으로 해당 빈을 대신 사용한다.

출처: https://jsonobject.tistory.com/235

3.2 ObjectMapper 설정 custom 하기

== 해결법 == 이번 해결을 위한 흐름의 결론

profile
Seungyeon Choi
캘린더 만드는 개발자입니당
다음 포스트

validation exception 이 2종류다?

0개의 댓글