java - Spring JPA - 更新 OnetoOne 关系的拥有端时出现 Stackoverflow 异常

Question

我在两个对象之间有一个一对一映射。

UserDO.java:

public class UserDO {

    @Id
    @GeneratedValue
    private Long id;

    @Column(nullable = false)
    @NotNull(message = "Username can not be null!")
    private String username;

    @Column(nullable = false)
    @NotNull(message = "Password can not be null!")
    private String password;

    @Column(nullable = false)
    private Boolean deleted = false;

    @Enumerated(EnumType.STRING)
    @Column(nullable = false)
    private OnlineStatus onlineStatus;

    @Column(nullable = false)
    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
    private ZonedDateTime dateCreated = ZonedDateTime.now();

    @OneToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    private CardDO card;

}

CardDO.java:

public class CardDO {

    @Id
    @GeneratedValue
    @Column(name="id")
    private Long id;

    @Column(nullable = false)
    private Long pan;

    @Column(nullable = false)
    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
    private LocalDate expirationDate;


    @Enumerated(EnumType.STRING)
    @Column(nullable = false)
    private CardType cardType;


    @Column(nullable = false)
    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
    private ZonedDateTime dateCreated = ZonedDateTime.now();

    @OneToOne(mappedBy="card")
    private UserDO user;

}

现在，当我第一次将两者链接起来并将用户对象保存在存储库中时，它工作正常，但每次当我尝试更新用户对象时，它都会抛出 StackOverFlow 异常。

链接两个对象的代码:

userDO.setCard(cardDO);
userRepository.save(userDO);

更新代码:

UserDO userDO = findUser(userId);
userDO.setOnlineStatus(onlineStatus);
userRepository.save(userDO);

可能出了什么问题？

Answer 1

您需要设置关系的所属站点:

public class CardDO {
    //skipped

    @OneToOne(mappedBy="card", insertable = false, updateable = false)
    private UserDO user;
}

和

@OneToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinColumn(name = card_id)
private CardDO card;

Hibernate脏检查机制发现CardDO已更新，因此想要更新User。然后是卡，然后是用户等等