4. [jpa] 1:1 양방향 연관 - Lazy Loadingpublic class Member { @Id private String email; private String name; @Temporal(TemporalType.DATE) private Date createdDate; @OneToOne(mappedBy = "owner", fetch = FetchType.LAZY) private MembershipCard membershipCard; } @Test public void 참조키를이용한일대일양방향연관레이지로딩() { // 1. 생성된 멤버는 아직 MembershipCard 가 존재하지 않음 Optional member = memberRepository.findById(email); assertTh..