Hibernate不是堅持嵌套關係

我有4個實體：播放，演員，播放表示和類別。每場比賽屬於一個類別，並且在某個特定時間，比賽將比賽與劇院和一些演員相關聯。下面是實體：Hibernate不是堅持嵌套關係

@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，Hibernate是試圖找到play_representation和類別之間的關係！我一直試圖堅持關係的戲劇，但它似乎我得到了錯誤，無法找出最好的辦法做到這一點...這是一個postgresql數據庫順便說一句。

我還在學習，所以如果您有關於我分享的代碼的任何其他提示，請讓我知道！

編輯：錯誤是：

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

來源

2017-04-16 Olaru Vlad

和錯誤信息是？！ –

你的ManyToMany是雙向的，但你還沒有把'mappedBy'鏈接到它們 –

我並不需要的mappedBy，它實際上是一個錯字 - 我寫play_representation_category代替play_representation_actors的。很愚蠢，是吧？至少我終於找到了:)

來源

2017-04-17 07:39:15

那麼你確實需要一個mappedBy，如果這個關係是雙向的。否則，它是兩個獨立的關係，你會在以後得到問題 –

好吧，我會檢查出來的！謝謝！ –

Hibernate不是堅持嵌套關係

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