toplink et glassfish v2

je suis entrain de developper une application jee (ejb3)sous netbeans 6.5 en utilisant glassfish v2 comme serveur d'application et toplink comme provider et mysql comme sgbd.
quand j'execute la classe VolFacade responsable de la persistence de l'entity bean Vol l'erreur suivante apparait:

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javax.persistence.PersistenceException: Exception [TOPLINK-7060] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Cannot acquire data source [voldb].
Internal Exception: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
 at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:239)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:93)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:126)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:120)
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:91)
        at ejb.VolFacade.getEntityManager(VolFacade.java:35)
        at ejb.VolFacade.create(VolFacade.java:47)
        at ejb.VolFacade.main(VolFacade.java:62)
Caused by: Exception [TOPLINK-7060] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: Cannot acquire data source [voldb].
Internal Exception: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
        at oracle.toplink.essentials.exceptions.ValidationException.cannotAcquireDataSource(ValidationException.java:373)
        at oracle.toplink.essentials.jndi.JNDIConnector.connect(JNDIConnector.java:135)
        at oracle.toplink.essentials.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:184)
        at oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:582)
        at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:280)
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:229)
        ... 7 more
Caused by: javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
        at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
        at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
        at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:385)
        at javax.naming.InitialContext.lookup(InitialContext.java:396)
        at oracle.toplink.essentials.jndi.JNDIConnector.connect(JNDIConnector.java:129)
        ... 11 more

voici le code de la classe VolFacade:

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package ejb;
 
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceUnit;
import javax.transaction.UserTransaction;
 
/**
 *
 * @author Administrateur
 */
@Stateless
public class VolFacade implements VolFacadeLocal {
 
@Resource
private UserTransaction utx = null;
@PersistenceUnit(unitName = "OACA-ejbPU")
private EntityManagerFactory emf = null;
 
private static final String JPA_UNIT_NAME = "OACA-ejbPU";
private EntityManager entityManager=null;
long n=0;
public EntityManager getEntityManager() {
if (entityManager == null) {
entityManager = Persistence.createEntityManagerFactory(JPA_UNIT_NAME).createEntityManager();
}
return entityManager;
}
 
public void create(long n) throws Exception {
 
try {
    Vol voll = new Vol(n);
voll.setDepart("dddddd");
voll.setDestination("fgfdd");
 
entityManager = getEntityManager();
 
entityManager.persist(voll);
 
utx.commit();
} finally {
if (entityManager != null) {
entityManager.close();
}
}
}
public static void main(String[] args){
try {
 
VolFacade vf = new VolFacade();
vf.create(5);
} catch (Exception ex) {
Logger.getLogger(VolFacade.class.getName()).log(Level.SEVERE, null, ex);
}
}
}

et le fichier persistence.xml:

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<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" 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_1_0.xsd">
  <persistence-unit name="OACA-ejbPU" transaction-type="JTA">
    <provider>oracle.toplink.essentials.PersistenceProvider</provider>
    <jta-data-source>voldb</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
      <property name="toplink.ddl-generation" value="create-tables"/>
    </properties>
  </persistence-unit>
</persistence>

est ce que je dois ajouter une datasource a glassfish si oui comment le faire??
sinon qu'est ce que je dois faire !!
je suis coincé il ya 3 jours et je ne trouve pas de solution
merci d'avance pour l'aide