Jpa@onetomany不能为逆边生成外键

Question

Movie类有一个他的会话列表，我想同时保存存储在列表中的电影和他的会话。

这是我的代码

public class Movie {

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

    ...

    @OneToMany(mappedBy = "movie",cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<Session> sessionList = new ArrayList<>();
}

public class Session {
 @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "session_id")
    private int sessionId;

    ...

    @ManyToOne
    @JoinColumn(name = "movie_id")
    private Movie movie;

}

public void testAddMovie(){
        Session session1 = new Session();
        session1.setDay("Monday");


        Movie movie = new Movie();
        movie.setTitle("hello");
        movie.getSessionList().add(session1);

        movieDao.addMovie(movie);
    }

   insert 
   into
           movies
            (actors, .... ,title) 
        values
            (?, ?, ?, ?, ..., ?, ?, ?, ?)

  insert 
  into
            sessions
            (day, movie_id, time) 
        values
            (?, ?, ?)

Hibernate不会引发异常，movie和session都成功地持久化了，但是表session中的外键'movie_id'始终显示为null。

那么问题出在哪里？当我只使用@onetomany而不使用@manytoone时，同样的测试工作正常，外键被成功添加。

Answer 1

在会话实体中，将de movie属性更改为：

@ManyToOne
@JoinColumn(name = "movie_id", foreignKey = @ForeignKey(name = "fk_session_movie."))
private Movie movie;