unexpected exception: java.lang.ExceptionInInitializerError

Bonjour,

Je développe une web app en GWT avec Hibernate (à peu près le tutoriel qu'il y a dans la doc) et j'obtiens ce message d'erreur.

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[ERROR] javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract 
java.lang.String com.hibernate_test.client.GreetingService.test(java.lang.String) 
throws java.lang.IllegalArgumentException' threw an unexpected 
exception: java.lang.ExceptionInInitializerError

Mes fichiers:
Dans GreetingServiceAsync.java :

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public interface GreetingServiceAsync {
	void greetServer(String input, AsyncCallback<String> callback)
			throws IllegalArgumentException;
	void test(String input, AsyncCallback<String> callback) throws IllegalArgumentException;
}

Dans GreetingService.java :

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public interface GreetingService extends RemoteService {
	String greetServer(String name) throws IllegalArgumentException;
	String test(String input) throws IllegalArgumentException;
}

Dans GreetingServiceImpl.java (cette fonction est appelée par le bouton de form) :

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	public String test(String input) throws IllegalArgumentException {
 
		Session session = HibernateUtil.getSessionFactory().getCurrentSession();
		session.beginTransaction();
 
		Events theEvent = new Events();
 
		theEvent.setTitle("aaaa");
		session.save(theEvent);
 
		session.getTransaction().commit();
 
		return input;
	}

Dans 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://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 
	<session-factory>
 
		<!-- Database connection settings -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.password"></property>
		<property name="connection.url">jdbc:mysql://127.0.0.1/hibernate_db</property>
		<property name="connection.username">root</property>
		<!-- SQL dialect -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
 
		<!-- Disable the second-level cache -->
		<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
 
		<!-- configuration pool via c3p0--> 
		<property name="c3p0.acquire_increment">1</property> 
		<property name="c3p0.idle_test_period">100</property> <!-- seconds --> 
		<property name="c3p0.max_size">100</property> 
		<property name="c3p0.max_statements">0</property> 
		<property name="c3p0.min_size">10</property> 
		<property name="c3p0.timeout">100</property> <!-- seconds --> 
		<!-- DEPRECATED very expensive property name="c3p0.validate>-->
 
		<!-- Echo all executed SQL to stdout -->
		<property name="show_sql">true</property>
		<mapping resource="org/hibernate/tutorial/domain/Events.hbm.xml"/>
 
	</session-factory>
 
</hibernate-configuration>

Dans HibernateUtil.java :

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package org.hibernate.tutorial.util;
 
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
 
public class HibernateUtil {
	private static final SessionFactory sessionFactory = buildSessionFactory();
	private static SessionFactory buildSessionFactory() {
 
		try {
			// Create the SessionFactory from hibernate.cfg.xml
			return new Configuration().configure("org/hibernate/tutorial/hibernate.cfg.xml").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 SessionFactory getSessionFactory() {
		return sessionFactory;
	}
 
}

Ma BD :

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CREATE TABLE IF NOT EXISTS `events` (
  `EVENT_ID` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(255) NOT NULL,
  PRIMARY KEY (`EVENT_ID`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;
 
 
INSERT INTO `events` (`EVENT_ID`, `title`) VALUES
(1, 'poj');

Ma Events.hbm.xml :

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 20 avr. 2011 15:58:13 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
 <class catalog="hibernate_db" name="Events" table="events">
  <id name="eventId" type="java.lang.Integer">
   <column name="EVENT_ID"/>
   <generator class="identity"/>
  </id>
  <property generated="never" lazy="false" name="title" type="string">
   <column name="title" not-null="true"/>
  </property>
 </class>
</hibernate-mapping>

Est-ce que c'est impossible de faire de l'Hibernate sur Google App Engine ?? Certains disent ça (http://www.developpez.net/forums/d74...gwt-hibernate/) mais ça m'étonne bcp !

Si qq'un peut m'aider, merci mille fois !!