<?xml version="1.0" encoding="UTF-8"?>
<persistence 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"
    version="2.0">

    <persistence-unit name="demojpa">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.archive.autodetection" value="class"/>
            <property name="hibernate.format_sql" value="true"/>

            <!-- Configuration de la BDD -->
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/demojpa" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="" />

            <!-- Specifie le dialecte SQL utilisé pour communiquer avec la BDD -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.MYSQLDialect"/>

            <!-- Indique a Hibernate de re-creer la BDD au lancement de l'applciation -->
            <property name="hbm2ddl.auto" value="create"/>

        </properties>
    </persistence-unit>
</persistence>

public class DemoJpa {

    public static void main(String[] args) {
        // 1 Ouverture unité de travail JPA
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("demojpa");
        EntityManager em = emf.createEntityManager();
}