Impossible de sauvegarder

bonsoir,

j'ai un petit probleme de sauvegarde,

j'ai créer deux eleves, chaque éleve "étudie" dans une école relation manyToOne

voici le code :

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
 
 
		SessionFactory factory = config.buildSessionFactory();
		Session session = factory.openSession();
 
		session.beginTransaction();
 
 
		Ecole ecole =new Ecole();
 
 
		ecole.setNameEcole("Nathan");
 
 
		Eleves eleve =new Eleves();
		eleve.setNom("Dzar");
		eleve.setPrenom("Dominique");
		eleve.setAge(36);
 
		eleve.setEcole(ecole);
 
		Eleves eleve2 =new Eleves();
		eleve2.setAge(27);
		eleve2.setNom("Pascale");
		eleve2.setPrenom("Dauphin");
 
		eleve2.setEcole(ecole);
 
 
		session.save(ecole);
		session.save(eleve);
		session.save(eleve2);
 
		session.beginTransaction().commit();

le probleme c'est que ce code génere une erreur de clé :

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Hibernate: select max(ID) from TEST.ECOLE
Hibernate: select max(ID) from TEST.ELEVES
Hibernate: insert into TEST.ECOLE (NAMEECOLE, ID) values (?, ?)
Hibernate: insert into TEST.ELEVES (NOM, PRENOM, AGE, ECOLE, ID) values (?, ?, ?, ?, ?)
Hibernate: insert into TEST.ELEVES (NOM, PRENOM, AGE, ECOLE, ID) values (?, ?, ?, ?, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not insert: [com.hibernate.test.Eleves]
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2436)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2856)
	at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
	at com.hibernate.test.Test.main(Test.java:97)
Caused by: java.sql.SQLIntegrityConstraintViolationException: INSERT sur la table 'ELEVES' a entraîné la violation de la contrainte de clé externe 'FK7A0E06465914D2D2' pour la clé (3).  L'instruction a été annulée.
	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
	at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown Source)
	at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeUpdate(Unknown Source)
	at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:46)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2416)
	... 11 more
Caused by: java.sql.SQLException: INSERT sur la table 'ELEVES' a entraîné la violation de la contrainte de clé externe 'FK7A0E06465914D2D2' pour la clé (3).  L'instruction a été annulée.
	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)
	... 22 more
Caused by: ERROR 23503: INSERT sur la table 'ELEVES' a entraîné la violation de la contrainte de clé externe 'FK7A0E06465914D2D2' pour la clé (3).  L'instruction a été annulée.
	at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
	at org.apache.derby.impl.sql.execute.ForeignKeyRIChecker.doCheck(Unknown Source)
	at org.apache.derby.impl.sql.execute.GenericRIChecker.doCheck(Unknown Source)
	at org.apache.derby.impl.sql.execute.RISetChecker.doFKCheck(Unknown Source)
	at org.apache.derby.impl.sql.execute.InsertResultSet.normalInsertCore(Unknown Source)
	at org.apache.derby.impl.sql.execute.InsertResultSet.open(Unknown Source)
	at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
	... 16 more

lorsque je sauvegarde avec un seul eleve cela fonctionne bien ! , je pense que l'objet ecole ne peut pas être sauvegardé plus de 2 fois à cause de la clé unique or je ne sais pas comment résoudre ce probleme .
merci !