Bonjour, :p

bon voila, je commence à utiliser hibernate ... j ai rencontré ce probleme:
erreur est coloré en rouge
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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Session session = HibernateUtil.getSessionFactory().getCurrentSession();
Transaction tx = null;
 
try {
 
    tx = session.beginTransaction();
 
    session.flush(); 
 
    //    Vector<User> users = new Vector<User>(session.createQuery("from User").list());
    List<User> lusers = (List)(session.createQuery("from User").list());
 
    User usr = new User();
    while (it.hasNext())
    {
        usr = (User) it.next();
 
        System.out.println(usr.getLogin() + " , " + usr.getMdp());
    }
 
    User NewUser = new User();
    NewUser.setLogin("myname");
    NewUser.setMdp("mypassword");
 
    session.save(NewUser); // ici l'erreur
    session.flush(); 
 
    tx.commit(); 
 
} catch (Exception e) {
 
    if (tx != null)
        tx.rollback();
 
    try {
        throw e;
    } finally {
        HibernateUtil.getSessionFactory().close();
    } 
}
le code d'erreur est le suivant
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Hibernate: select user0_.login as login0_, user0_.mdp as mdp0_ from user user0_
user1 , mdp1
user2 , mdp2
user3 , mdp3
user4 , mdp4
 
Hibernate: insert into user (login, mdp) values (null, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not insert: [com.hibernate.beans.User]
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:40)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2158)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2638)
    at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
    at $Proxy0.save(Unknown Source)
    at spring.Main.<init>(Main.java:46)
    at spring.Main.main(Main.java:17)
Caused by: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Column 'login' cannot be null
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:931)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:3256)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1313)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1585)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1500)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1485)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:73)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:33)
    ... 23 more
Hibernate ne voit pas les attributs de mon objet NewUser ... Help!