j'ai utilisé hibernate 3.0 avec myeclipse pour connecter a une base de donneé mysql mais toujours le message suivant apparait

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:378)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:110)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)
at com.hibernate.Inserssion.main(Inserssion.java:23)
mon fichier de configuration hibernate.cfg.xml est le suivant


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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">
 
<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>
 
	<session-factory>
	    <property name="dialect">
           org.hibernate.dialect.MySQLDialect</property>
           <property name="current_session_context_class">thread</property>
 
 
		<property name="connection.username">root</property>
		<property name="connection.url">
			jdbc:mysql://localhost/testbd
		</property>
		<property name="dialect">
			org.hibernate.dialect.MySQLDialect
		</property>
		<property name="myeclipse.connection.profile">
			maconnexion
		</property>
		<property name="connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		<mapping resource="com/hibernate/Personnes.hbm.xml" />
 
	</session-factory>
 
</hibernate-configuration>

pouvez vous m'aider svp