bonjour tous le monde

je suis entrain de faire une application jpa ,mysql et tomcat je suis bloque par un message d 'erreur que trouver pas la solution
merci pour votre aide

voici le message d 'erreur
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 01-mars-2013 17:19:29 org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: "Servlet.service()" pour la servlet UserServlet a généré une exception
javax.persistence.PersistenceException: [PersistenceUnit: myjpa] Unable to build EntityManagerFactory
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
	at com.jpa03.impl.UserImplDao.<init>(UserImplDao.java:13)
	at com.jpa03.controller.UserServlet.doGet(UserServlet.java:35)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
	at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:80)
	at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:62)
	at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:460)
	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:155)
	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2101)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1325)
	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
	... 19 more
lle fichier persistence.xml
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 <?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
	<persistence-unit name="myjpa" transaction-type="RESOURCE_LOCAL">
 
		<class>com.jpa03.model.Adress</class>
		<class>com.jpa03.model.Client</class>
		<class>com.jpa03.model.Commande</class>
		<class>com.jpa03.model.Person</class>
		<class>com.jpa03.model.User</class>
		<properties>
			<property name='"javax.persistence.jdbc.user"' value="root"/>
			<property name='"javax.persistence.jdbc.passwordr"' value="root"/>
			<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
			<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/demo"/>
			<property name="javax.persistence.jdbc.user" value="root"/>
			<property name="javax.persistence.jdbc.password" value="root"/>
 
		</properties>
	</persistence-unit>
</persistence>
voici la classe dao
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package com.jpa03.impl;
 
import java.util.ArrayList;
 
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
 
import com.jpa03.dao.Dao;
import com.jpa03.model.User;
 
public class UserImplDao implements Dao<User> {
    private EntityManagerFactory emf =Persistence.createEntityManagerFactory("myjpa");
    private EntityManager em = emf.createEntityManager();
	public UserImplDao() {
 
	}
 
	@Override
	public void add(User o) {
		try{
		  em.getTransaction().begin();	
		  em.persist(o);
		  em.getTransaction().commit();
		}catch(Exception e){ System.out.print("erreur add user :"+e.getMessage());}
		finally{if(em!=null)em.close();}
	}
 
	@Override
	public ArrayList<User> findAll() {
		// TODO Auto-generated method stub
		return null;
	}
 
	@Override
	public void remove(User o) {
		// TODO Auto-generated method stub
 
	}
 
}
voici les fichiers jar
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antlr.jar
asm.jar
asm-attrs.jar
dom4j-1.6.1.jar
ejb3-persistence.jar
hibernate3.jar
hibernate-annotations.jar
hibernate-commons-annotations.jar
hibernate-core.jar
hibernate-entitymanager.jar
hibernate-validator.jar
hsqldb.jar
javassist.jar
jboss-common.jar
jta.jar
junit.jar
log4j.jar
slf4j-api.jar
slf4j-log4j12.jar
slf4j-simple-1.5.8.jar