Error while testing hibernate

[smi ensi]

utilisateurs.java

package Model;

import Model.base.BaseUtilisateurs;

/**
 * This is the object class that relates to the utilisateurs table.
 * Any customizations belong here.
 */
public class Utilisateurs extends BaseUtilisateurs {

/*[CONSTRUCTOR MARKER BEGIN]*/
	public Utilisateurs () {
		super();
	}

	/**
	 * Constructor for primary key
	 */
	public Utilisateurs (java.lang.Integer _iduser) {
		super(_iduser);
	}

	/**
	 * Constructor for required fields
	 */
	public Utilisateurs (
		java.lang.Integer _iduser,
		java.lang.String _password,
		java.lang.String _nom,
		java.lang.String _prenom,
		java.lang.String _email,
		java.lang.String _login) {

		super (
			_iduser,
			_password,
			_nom,
			_prenom,
			_email,
			_login);
	}

/*[CONSTRUCTOR MARKER END]*/
}

---
hibernateSessionFactory

package Model;

import Model.base.BaseUtilisateurs;

/**
 * This is the object class that relates to the utilisateurs table.
 * Any customizations belong here.
 */
public class Utilisateurs extends BaseUtilisateurs {

/*[CONSTRUCTOR MARKER BEGIN]*/
	public Utilisateurs () {
		super();
	}

	/**
	 * Constructor for primary key
	 */
	public Utilisateurs (java.lang.Integer _iduser) {
		super(_iduser);
	}

	/**
	 * Constructor for required fields
	 */
	public Utilisateurs (
		java.lang.Integer _iduser,
		java.lang.String _password,
		java.lang.String _nom,
		java.lang.String _prenom,
		java.lang.String _email,
		java.lang.String _login) {

		super (
			_iduser,
			_password,
			_nom,
			_prenom,
			_email,
			_login);
	}

/*[CONSTRUCTOR MARKER END]*/
}

EtudiantDAO.java
---

package Model.dao;

import java.util.Iterator;
import java.util.List;

import net.sf.hibernate.HibernateException;

import org.hibernate.Session;
import org.hibernate.Transaction;

import Model.Utilisateurs;
public class EtudiantDAO {

	public static void main(String [] args) throws HibernateException{
		Session session = (Session) HibernateSessionFactory.currentSession();
		Transaction tx = session.beginTransaction();
		//On insère 2 etudiant dans la BDD
		Utilisateurs  client = new Utilisateurs();



		client.setIduser(12);
		client.setPassword("root");
		client.setNom("kete");
		client.setPrenom("koli");
		client.setEmail("@gmail.com");
		client.setLogin("kolo");
	    client.setAdresse("rue 209");
	    client.setNewsletter(true); 
		client.setTel("0908PP8967") ;
		client.setEmailsecours ("iouioui");
	    client.setVille ("rabat"); 
		client.setNumappartement(12);
	    client.setTypeuser ("1");
		client.setCodepostal("234"); 
        client.setSexe("femme");
		client.setQuartier ("ensi");
        client.setInterphone ("13423") ;
		
	
		
		session.save(client);
		client = new Utilisateurs();
		
		
		client.setIduser(12);
		client.setPassword("root");
		client.setNom("kete");
		client.setPrenom("koli");
		client.setEmail("@gmail.com");
		client.setLogin("kolo");
	    client.setAdresse("rue 209");
	    client.setNewsletter(true); 
		client.setTel("0908PP8967") ;
		client.setEmailsecours ("iouioui");
	    client.setVille ("rabat"); 
		client.setNumappartement(12);
	    client.setTypeuser ("1");
		client.setCodepostal("234"); 
        client.setSexe("femme");
		client.setQuartier ("ensi");
        client.setInterphone ("13423") ;
        
		session.save(client);
		tx.commit();
		List list = session.createQuery("from Etudiant").list();
		Iterator it = list.iterator();
		while(it.hasNext())
		{
			Utilisateurs e = (Utilisateurs)it.next();
		System.out.println(e.getPrenom()+" "+ e.getNom());
		}
		HibernateSessionFactory.closeSession();
		}

	
	
}

then I download apach-log4j-1.2.16 and communs-loggin and I put then into tomcate/lib

error testing are :

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Initial SessionFactory creation failed.org.hibernate.HibernateException: Could not instantiate dialect class
Exception in thread "main" java.lang.ExceptionInInitializerError
at Model.dao.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:22)
at Model.dao.EtudiantDAO.main(EtudiantDAO.java:15)
Caused by: org.hibernate.HibernateException: Could not instantiate dialect class
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:84)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:42)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:409)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2006)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1289)
at Model.dao.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:17)
... 1 more
Caused by: java.lang.ClassCastException: net.sf.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:78)
... 7 more