EJB Session Bean MySQL

Bonjour,
je travaille sur un mini projet java et j'ai toujours l 'erreur suivant

java.lang.IllegalStateException:
Exception Description: Cannot use an EntityTransaction while using JTA.

j'ai fait un projet j2ee entreprise application

voila mon entity bean

Code:

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package pack.test;
 
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
 
/**
 *
 * @author hamza
 */
@Entity
@Table(name = "personne", catalog = "bourse", schema = "")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Personne.findAll", query = "SELECT p FROM Personne p"),
    @NamedQuery(name = "Personne.findByNum", query = "SELECT p FROM Personne p WHERE p.num = :num"),
    @NamedQuery(name = "Personne.findByNom", query = "SELECT p FROM Personne p WHERE p.nom = :nom")})
public class Personne implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @NotNull
    @Column(name = "num", nullable = false)
    private Integer num;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 20)
    @Column(name = "nom", nullable = false, length = 20)
    private String nom;
 
    public Personne() {
    }
 
    public Personne(Integer num) {
        this.num = num;
    }
 
    public Personne(Integer num, String nom) {
        this.num = num;
        this.nom = nom;
    }
 
    public Integer getNum() {
        return num;
    }
 
    public void setNum(Integer num) {
        this.num = num;
    }
 
    public String getNom() {
        return nom;
    }
 
    public void setNom(String nom) {
        this.nom = nom;
    }
 
    @Override
    public int hashCode() {
        int hash = 0;
        hash += (num != null ? num.hashCode() : 0);
        return hash;
    }
 
    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Personne)) {
            return false;
        }
        Personne other = (Personne) object;
        if ((this.num == null && other.num != null) || (this.num != null && !this.num.equals(other.num))) {
            return false;
        }
        return true;
    }
 
    @Override
    public String toString() {
        return "pack.test.Personne[ num=" + num + " ]";
    }
 
}

voila mon session bean

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/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package pack.test;
 
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContext;
 
/**
 *
 * @author hamza
 */
@Stateless
public class sessiontest implements sessiontestLocal {
    @PersistenceContext(unitName = "TestEjb-ejbPU")
    private EntityManager em;
 
    @Override
    public void persist(Object object) {
        em.persist(object);
    }
 
    @Override
     public void creerpersonne(int num, String nom) {
        Personne p = new Personne(num,nom);
        EntityManagerFactory emf=Persistence.createEntityManagerFactory("TestEjb-ejbPU");
         em=emf.createEntityManager();
         em.getTransaction().begin();
         em.persist(p);
         em.getTransaction().commit();
         em.close();
    }
 
}

persistabce.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="TestEjb-ejbPU" transaction-type="JTA">
    <jta-data-source>boursecnx</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties/>
  </persistence-unit>
</persistence>

index.jsp

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<%-- 
    Document   : index
    Created on : 23 déc. 2011, 03:42:10
    Author     : hamza
--%>
 
<%@page import="pack.test.sessiontest"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        <h1>Hello World!</h1>
 
        <%
 
            sessiontest objs = new sessiontest();
            objs.creerpersonne(5, "jj");
        %>
 
    </body>
</html>

aidez moi SVP a trouver d’où arrive l erreur sachant que je travail sur une base de donnée mysql