在同一表上具有多列的多对多

你说过

同一张桌子上的* 多对多关系 *

这不是一个好主意。这是一场噩梦。

试试这个

@Entitypublic class Friend {    @Id    @GeneratedValue(strategy=GenerationType.AUTO)    private Integer friendId;    @Column    private String name;    @oneToMany(mappedBy="me")    private List<MyFriends> myFriends;}@Entitypublic class MyFriends {    @EmbeddedId    private MyFriendsId id;    @Column    private String additionalColumn;    @ManyToOne    @JoinColumn(name="ME_ID", insertable=false, updateable=false)    private Friend me;    @ManyToOne    @JoinColumn(name="MY_FRIEND_ID", insertable=false, updateable=false)    private Friend myFriend;    @Embeddable    public static class MyFriendsId implements Serializable {        @Column(name="ME_ID", nullable=false, updateable=false)        private Integer meId;        @Column(name="MY_FRIEND_ID", nullable=false, updateable=false)        private Integer myFriendId;        public boolean equals(Object o) { if(o == null)     return false; if(!(o instanceof MyFriendsId))     return false; MyFriendsId other = (MyFriendsId) o; if(!(other.getMeId().equals(getMeId()))     return false; if(!(other.getMyFriendId().equals(getMyFriendId()))     return false; return true;        }        public int hashpre() { // hashpre impl        }    }}

问候，