Hibernate不是坚持嵌套关系

我有4个实体：播放，演员，播放表示和类别。每场比赛属于一个类别，并且在某个特定时间，比赛将比赛与剧院和一些演员相关联。下面是实体：Hibernate不是坚持嵌套关系

@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);

我遇到的问题是，Hibernate是试图找到play_representation和类别之间的关系！我一直试图坚持关系的戏剧，但它似乎我得到了错误，无法找出最好的办法做到这一点...这是一个postgresql数据库顺便说一句。

我还在学习，所以如果您有关于我分享的代码的任何其他提示，请让我知道！

编辑：错误是：

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

来源

2017-04-16 Olaru Vlad

和错误信息是？！ –

你的ManyToMany是双向的，但你还没有把'mappedBy'链接到它们 –

我并不需要的mappedBy，它实际上是一个错字 - 我写play_representation_category代替play_representation_actors的。很愚蠢，是吧？至少我终于找到了:)

来源

2017-04-17 07:39:15

那么你确实需要一个mappedBy，如果这个关系是双向的。否则，它是两个独立的关系，你会在以后得到问题 –

好吧，我会检查出来的！谢谢！ –

Hibernate不是坚持嵌套关系

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