복합키 식별 관계 매핑에 대해서 여쭈어봅니다.

선생님...

현재 복합키 식별 관계의 mapping에서 선생님 책을 보고 인터넷을 찾아봐도 문제에 부딪혀 해결에 지쳐서 질문을 드립니다.

@IdClass(InternetBuzzIdentifier.class)
public class InternetBuzz {

    @Id private String program;
    @Id private String channel;
    @Id private String days;
...

@Getter @Setter
public class InternetBuzzIdentifier implements Serializable {
    private String program;
    private String channel;
    private String days;
...

@Entity
@Getter
@Setter
public class InternetBuzzMapping {

    @Id @GeneratedValue
    private Long id;
    private String contentId;
    private String contentsetId;

    @OneToOne
    @JoinColumns ({@JoinColumn (name = "program"),
            @JoinColumn (name = "channel"),
            @JoinColumn (name = "days")})
    private InternetBuzz internetBuzz;

    public InternetBuzzMapping(InternetBuzz internetBuzz) {
        this.internetBuzz = internetBuzz;
    }

처음에는 하나의 repository(InternetBuzz)을 만들었고  둘의 연결관계를 통해서 internetbuzz를 save하면 자동으로 InternetBuzzMapping 테이블에도 program, channel, days값이 들어가길 원하는데 internetbuzz.save()를 하면 internetbuzzmapping 테이블은 그대로입니다.

internetBuzzRepository.save(buzz);
internetBuzzMappingRepository.save(new InternetBuzzMapping(buzz));

그래서 internetbuzzMappingRepository를 만들어 위와같이 save를 하려하니

Caused by: java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : racoi.Dto.InternetBuzzMapping.internetBuzz -> racoi.Dto.InternetBuzz

위와같은 에러가 납니다.

어떤게 문제인지 책을 뒤져봐도 잘 이해가 안갑니다 ㅠ

@OneToOne(mappedBy = "internetBuzz", cascade = CascadeType.ALL)
private InternetBuzzMapping internetBuzzMapping;

InternetBuzzMapping mapping = new InternetBuzzMapping();
buzz.setInternetBuzzMapping(mapping);
mapping.setInternetBuzz(buzz);
mapping.getInternetBuzz().setChannel(channel);
mapping.getInternetBuzz().setDays(days);
mapping.getInternetBuzz().setProgram(program);
internetBuzzRepository.save(buzz);