是否可以在一个JPA实体中映射同一对象的两个实例？

Question

我有这样的实体：

@Entity
@Table(name = "ROOM")
public class Room implements Serializable {

   private static final long serialVersionUID = 1L;

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "room_id")
   private Integer id;

   @Column(name = "number") 
   private String number; //immutable

   @Column(name = "capacity")
   private Integer capacity;

}

如何在另一个实体中映射Room的两个实例。就像这样：

@Entity
@Table(name = "BUILDING")
public class Building implements Serializable {

  private static final long serialVersionUID = 1L;

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "building_id")
   private Integer id;

   @Column(name = "LeftRoom") 
   private Room left; 

   @Column(name = "RightRoom")
   private Room right;

}