jpa에서는 저장시 repository.save 함수를 이용하여 저장합니다

Member class처럼 @OneToMany나 @ManyToOne 필드들을 함께 저장 할 수 있습니다.

Member.java

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@Entity 
@Table(name = "tb_member")
public class Member {
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "member_seq")
    public Integer memberSeq;

    @Column
    public String nickname;
    
    @Expose
    @OneToMany(
            targetEntity = MemberInter.class
            , cascade = CascadeType.ALL
            , fetch = FetchType.EAGER
            , mappedBy = "memberSeq")
    public List<MemberInter> memberInterList;
}

MemberInter.java

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@Entity 
@Table(name="tb_member_inter") 
@IdClass(value = MemberInterPk.class)
public class MemberInter {
    @Id 
    @Column(name = "member_seq")
    public Integer memberSeq;
    
    @Id 
    @Column(name = "inter_seq")
    public Integer interSeq;
    
    @ManyToOne(
            targetEntity = Inter.class
            ,cascade = CascadeType.ALL
            ,fetch = FetchType.LAZY
            ,optional = false
    )
    @JoinColumn(name = "inter_seq", referencedColumnName = "inter_seq"
            , insertable = false, updatable = false)
    public Inter inter;
}

@JoinColumn에 insertable, updateable을 추가 하여 false 했습니다

Test method

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@Test
public void testSave() throws Exception{
    logger.info("------------ jpa test starting.... ------------------------");
    
    Member data = memberRepository.findByNickname("111");
    logger.info("data={}", gson.toJson(data));
    
    data.nickname = "222";
    
    MemberInter memberInter = new MemberInter();
    memberInter.interSeq = 28;
    memberInter.memberSeq = data.memberSeq;

    MemberInter memberInter2 = new MemberInter();
    memberInter2.interSeq = 29;
    memberInter2.memberSeq = data.memberSeq;

    data.memberInterList.add(memberInter);
    data.memberInterList.add(memberInter2);
    
    // 실제 저장. (member클래스를 저장. 한다)
    memberRepository.save(data);
    
    logger.info("------------ jpa test ended....    ------------------------");
}

위 test method를 실행하면 아래와 같이 sql가 실행됩니다

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...
...
Hibernate: insert into tb_member_inter (inter_seq, member_seq) values (?, ?)
Hibernate: insert into tb_member_inter (inter_seq, member_seq) values (?, ?)
Hibernate: update tb_member set nickname=? where member_seq=?

로그에서 insert into가 두번 호출 되고 update도 한번 실행되는것을 확인 할 수 있습니다.