Two Entity has @OneToMany to the same Entity

[claudio_br]

How can I do two Entity has @OneToMany to the same Entity?
For example the Entity A has @OneToMany to Entity C and Entity B has @OneToMany to Entity C too.
The Hibernate adds in the Entity C the id of Entity A or Entity B, but in the search the Hibernate doesn´t know of which Entity the id referer (Entity A or Entity B).
How can I resolve this problem?
Thanks

[claudio_br]

You can resolve this with:

@Entity
public class A implements Serializable{

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

 @OneToMany(mappedBy="a", fetch = FetchType.EAGER)
 @Cascade(CascadeType.ALL)
 private Set<C> cs = new HashSet<C>();

 .
 .
 .

}

@Entity
public class B implements Serializable{

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

 @OneToMany(mappedBy="b", fetch = FetchType.EAGER)
 @Cascade(CascadeType.ALL)
 private Set<C> cs = new HashSet<C>();

 .
 .
 .

}

@Entity
public class C implements Serializable{

 @ManyToOne(fetch = FetchType.EAGER)
 @JoinColumn(name="id_a", insertable=true, updatable=true)
 @Fetch(FetchMode.JOIN)
 @Cascade(CascadeType.SAVE_UPDATE)
 private A a;

 @ManyToOne(fetch = FetchType.EAGER)
 @JoinColumn(name="id_b", insertable=true, updatable=true)
 @Fetch(FetchMode.JOIN)
 @Cascade(CascadeType.SAVE_UPDATE)
 private B b;

 .
 .
 .
}