Hibernate沒有持久的嵌套關系

Question

我有4個實體：播放，演員，播放表示和類別。 每個戲劇都屬於一個類別，並且戲劇表示將給定時間的戲劇與劇院和許多演員相關聯。 以下是實體：

@Entity
@Table(name = "category")
public class Category {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @Column(name = "name")
    private String name;

    @OneToMany(mappedBy="category")
    private List<Play> playList = new ArrayList<Play>();

---

@Entity
@Table(name = "actor")
public class Actor {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private long id;

    @Column(name = "first_name")
    private String firstName;

    @Column(name = "last_name")
    private String lastName;

    @Column(name = "description")
    private String description;

    @Column(name = "profile_picture")
    private String profilePicturePath;

    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinTable(name = "play_representation_category",
            joinColumns = {@JoinColumn(name = "actor_id")},
            inverseJoinColumns = {@JoinColumn(name = "play_representation_id")})
    private Set<PlayRepresentation> playRepresentations = new HashSet<>(0);

---

@Entity
@Table(name = "play")
public class Play {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @NotNull
    @Column(name = "name")
    private String name;

    @NotNull
    @Column(name = "description")
    private String description;

    @Column(name = "image_paths")
    private String imagePaths;

    @NotNull
    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    private Category category;

---

@Entity
@Table(name = "play_representation")
public class PlayRepresentation {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private int id;

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "play_id")
    private Play play;

    @OneToOne
    @JoinColumn(name = "theater_id")
    private Theater theater;

    @Column(name = "date")
    private Timestamp airingDate;

    @ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinTable(name = "play_representation_category",
            joinColumns = {@JoinColumn(name = "play_representation_id", nullable=false)},
            inverseJoinColumns = {@JoinColumn(name = "actor_id", nullable=false)})
    private Set<Actor> actors = new HashSet<>(0);

我遇到的問題是休眠狀態正在嘗試找到play_representation和category之間的關系！ 我一直在努力保持戲劇的關系，但似乎我錯了，無法找出最好的方法...順便說一下，這是一個PostgreSQL數據庫。

我仍在學習中，因此，如果您有關於我分享的代碼的其他提示，請告訴我！

編輯：錯誤是：

org.postgresql.util.PSQLException: ERROR: relation "play_representation_category" does not exist
  Position: 281

Answer 1

我不需要mappedBy，它實際上是一個錯字-我寫了play_representation_category而不是play_representation_actors。 太傻了吧？ 至少我終於找到了它:)