hibernate + mysql + tomcat

Bonjour,
J'ai une erreur d'éxécution que j'arrive pas a resoudre vu ke je suis debutant ds se domaine.
l'erreur est la suivante :

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Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: org/dom4j/Attribute
Exception in thread "main" java.lang.ExceptionInInitializerError
	at istia.st.springmvc.personnes.hibernate.HibernateUtil.<clinit>(HibernateUtil.java:17)
	at Test.main(Test.java:9)
Caused by: java.lang.NoClassDefFoundError: org/dom4j/Attribute
	at istia.st.springmvc.personnes.hibernate.HibernateUtil.<clinit>(HibernateUtil.java:13)
	... 1 more

je vous donne les principaux fichiers qui interviennent, c'est trop long je sais ,si vous avez un peu de temps jetez un coup d'oeuil
merci

ma classe de test est :

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import java.util.*;
import net.sf.hibernate.*;
import istia.st.springmvc.personnes.hibernate.*;
 
public class Test {
 
 public static void main(String[] args)
	throws HibernateException {
        Session s = HibernateUtil.currentSession();
        HibernateUtil.closeSession();
        System.exit(0);    
 }
}

ma classe HibernateUtil est :

Code:

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public class HibernateUtil {
 
    private static final SessionFactory sessionFactory;
 
    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
 
    public static final ThreadLocal session = new ThreadLocal();
 
    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
        if (s == null) {
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }
 
    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        session.set(null);
        if (s != null)
            s.close();
    }
}

mon fichier hibernate.cfg.xml est

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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration
    PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">
 
<hibernate-configuration>
	<session-factory>
		<!-- local connection properties -->
		<property name="hibernate.connection.url">
			jdbc:mysql://localhost/dbpersonnes
		</property>
		<property name="hibernate.connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password" />
		<!-- property name="hibernate.connection.pool_size"></property -->
		<!-- dialect for MySQL -->
		<property name="dialect">
			net.sf.hibernate.dialect.MySQLDialect
		</property>
		<property name="hibernate.show_sql">false</property>
		<property name="hibernate.use_outer_join">true</property>
 
		<property name="hibernate.transaction.factory_class">
			net.sf.hibernate.transaction.JTATransactionFactory
		</property>
		<property name="jta.UserTransaction">
			java:comp/UserTransaction
		</property>
 
 
		<mapping resource="Personnes.hbm.xml" />
	</session-factory>
</hibernate-configuration>

et finalement mon fichier hbm est

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >
 
<hibernate-mapping package="istia.st.springmvc.personnes.hibernate">
	<class name="Personnes" table="personnes">
		<id
			column="ID"
			name="Id"
			type="integer"
		>
			<generator class="increment"/>
		</id>
		<property
			column="VERSION"
			length="11"
			name="Version"
			not-null="false"
			type="integer"
		 />
		<property
			column="DATENAISSANCE"
			length="10"
			name="Datenaissance"
			not-null="false"
			type="date"
		 />
		<property
			column="NOM"
			length="20"
			name="Nom"
			not-null="false"
			type="string"
		 />
		<property
			column="PRENOM"
			length="20"
			name="Prenom"
			not-null="false"
			type="string"
		 />
		<property
			column="NBENFANTS"
			length="11"
			name="Nbenfants"
			not-null="false"
			type="integer"
		 />
		<property
			column="MARIE"
			length="11"
			name="Marie"
			not-null="false"
			type="integer"
		 />
	</class>
</hibernate-mapping>