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hibernatehibernate-mapping

hibernate mapping confusion

Could someone explain me why this doesn't work? I want to have a table that contains informations about two users who played with each other. This doesn't work.

Public class History implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @ManyToOne
    @Column(nullable = false)
    private UserDetails player1;

    @ManyToOne
    @Column(nullable = false)
    private UserDetails player2;

    @ManyToOne
    @Column(nullable = false)
    private UserDetails winner;

    @Column(nullable = false)
    private Date time;

}

What am I doing wrong and how to fix it?

Solution

  • @Column is used to specify the mapping of a basic type. To specify the mapping of an association to another entity, you use a @JoinColumn (or a @JoinTable, depending on what you want):

    @ManyToOne
@JoinColumn(nullable = false)
private UserDetails player1;