InheritanceType JOINED WrongClassException

Bonjour a tous j'ai un schemas comme ceci

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institution | union | federation | confederation

union, federation et confederation heritent de institution,
une union peut avoir plusieurs institutions,
une federation plusieurs unions et une confederation plusieurs confederations ce qui nous ammene a ce mapping :
AbstractEntity

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@MappedSuperclass
public abstract class AbstractEntity {
 
	protected Long id;
	//getters & setters

institution

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@Entity
@Table(name = "******", catalog = "*****")
@Inheritance(strategy = InheritanceType.JOINED)
public class Institution extends AbstractEntity implements java.io.Serializable {
	private Union union;

Union

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@Entity
@Table(name = "*****", catalog = "*****")
@PrimaryKeyJoinColumn(name="id")
public class Union extends Institution implements java.io.Serializable {
          private Federation federation;

Federation

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@Entity
@Table(name = "*******", catalog = "*****")
@PrimaryKeyJoinColumn(name="id")
public class Federation extends Institution implements java.io.Serializable {
        private Confederation confederation;

Confederation

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@Entity
@Table(name = "*****", catalog = "***")
@PrimaryKeyJoinColumn(name="id")
public class Confederation extends Sfd implements java.io.Serializable {

Le probleme c'est que quand j'execute j'ai un

Code:

org.hibernate.WrongClassException : Object with id: 2 was not of the specified subclass: com.***.Union (loaded object was of wrong class com.***.Federation)

PS j'ai un tableau de ce type

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+-----------+  +------------+  +-------------+  +-------+
| Instit___|    | Union___|   |  Federat  |   | Conf |
+-----------+   +------------+  +------------+   +-------+
| id |union|*|  |id | federa|  |id |  confed|  |id    |
+-----------+   +-------------+ +-------------+ +----+
| 1   | NULL|   |___________|   |_________|     |  1   |
| 2   | NULL|   |   2 | 2      |   | 2 |  1        |     -------
| 3   | NULL|   |   3 | NUL  |   ---------------
| 4   | NULL|   |   4 |NUL   | 
| 5   |  3 __|  |________|
| 6   |   4__|
| 7   | NULL|
+------------+

Petite specificite : l'institution numero 2 est en meme temps une union et une federation.