[Mapping] Erreur "Could not find a getter"

Bonjour,

Dans mon projet web dynamique avec Hibernate et MySQL, j'ai une erreur qui m'indique que le getter de id-ecole n'est pas trouvé alors qu'il est bien crée dans la classe bean.

Je compile GestionEcole.java comme application java j'obtiens :
Erreur :

Code:

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Exception in thread "main" java.lang.ExceptionInInitializerError
    at essai1.GestionEcole.ajouterEcole(GestionEcole.java:11)
    at essai1.GestionEcole.main(GestionEcole.java:22)
Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for id_ecole in class essai1.ecole
    at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:306)
    at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:299)
    at org.hibernate.tuple.PropertyFactory.getGetter(PropertyFactory.java:191)
    at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:67)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:147)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:457)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:131)
    at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
    at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:261)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
    at util.HibernateUtil.<clinit>(HibernateUtil.java:8)
    ... 2 more

voila mon code:
code src/essai1/ecole.java

Code:

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package essai1;
 
public class ecole {
 
    private int id_ecole;
    private String nom_ecole;
 
    public int getIdEcole() {
        return id_ecole;
    }
 
    public void setIdEcole(int id) {
        this.id_ecole = id;
    }
 
    public String getNomEcole() {
        return nom_ecole;
    }
 
    public void setNomEcole(String nom) {
        this.nom_ecole = nom;
    }
}

code src/map/Ecole.hbm.xml

Code:

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<?xml version="1.0" encoding="UTF-8"?>
 
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 
        <hibernate-mapping>
 
        <class name="essai1.ecole" table="ecole">
        <id name="id_ecole" type="java.lang.Integer" column="id_ecole">
        <generator class="increment"/>
        </id>
        <property name="nom_ecole" type="java.lang.String">
        <column name="nom_ecole"/>
        </property>
 
        </class>
        </hibernate-mapping>

code src/map/hibernate.cfg.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/essaihibernate</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">125487</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
 
<mapping resource="map/Ecole.hbm.xml"/>
 
</session-factory>
 
</hibernate-configuration>

code src/util/HibernateUtil

Code:

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package util;
 
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
 
public class HibernateUtil {
    public static final SessionFactory sessionFactory = new Configuration()
            .configure("map/hibernate.cfg.xml").buildSessionFactory();
 
    static {
        try {
            getSessionFactory();
        } catch (Throwable ex) {
            System.err.println("InitialSessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
 
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

code src/essai1/GestionEcole.java

Code:

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package essai1;
 
import org.hibernate.classic.Session;
import util.HibernateUtil;
 
public class GestionEcole {
 
    public void ajouterEcole(String nom_ecole) {
 
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
 
        ecole e = new ecole();
        session.save(e);
        session.getTransaction().commit();
        System.out.println("Ajout effectué avec succès");
    }
 
    public static void main(String[] args) {
        GestionEcole gp = new GestionEcole();
        gp.ajouterEcole("Ecole1");
        gp.ajouterEcole("Ecole2");
    }
}

Quelqu'un saurait-il m'expliquer d'où vient le problème ?

Merci d'avance pour votre aide.