Accessing persist method in SLSB from my SFSB

[Julien Marchal]

Hello,

I have an issue with an order i try to persist. I use Hibernate 4 with JPA and Jboss 7.1. I have a shopping cart which is a SFSB :

/**
 * Session Bean implementation class ShoppingCart
 */
@Stateful
@LocalBean
public class ShoppingCart {

	@EJB
	private CommandeHome commandeDAO;
	private ComposerHome lignesDAO;

    Commande commande;
    Utilisateur userRef;
    double price;
    
    
    public void initialize(){
    	if (commande == null) {
    		commande = new Commande();
		}
    }
    
    public void bindUser(Utilisateur user) {
        userRef = user;  
        userRef.getCommandes().add(commande);
        commande.setUtilisateur(userRef);
    	commande.setEtatcommande("En préparation");
    	commande.setRefcommande("testref");
    }
     
    public void addProduct(Produit prod, int qte){	
    	boolean prodFound = false;
    	Set<Composer> lignes = commande.getComposers();
    	for (Composer ligneComm : lignes) { //parcourt lignes de la commande
			if (ligneComm.getProduit().getNomproduit().equals(prod.getNomproduit())) { //Si le produit ajouté est déjà présent
				ligneComm.setQuantitecommande(ligneComm.getQuantitecommande() + qte); // On le met à jour
				prodFound = true;
			}
		}
    	
    	if (!prodFound) {
    		Composer item = new Composer();
    		item.setCommande(commande);
    		item.setProduit(prod);
    		item.setQuantitecommande(qte);
    		item.setDatecommande(new Date());
    		commande.getComposers().add(item);
		}
		
    [...]
    
    public void executeSale(String cardNumber){ 	

    	commandeDAO.persist(commande); 
    	for (Composer ligne : commande.getComposers()) {
    		ligne.setId(new ComposerId(commande.getIdcommande(), ligne.getProduit().getIdproduit()));
    		lignesDAO.persist(ligne);
		}
    	commandeDAO.merge(commande);
    	   	  	
    }

}

In the executeSale method I'm using methods from my SLSB DAO (I'm only going to display the first one which is where it fails since it's first) :

/**
 * Home object for domain model class Commande.
 * @see com.booxstore.business.dao.Commande
 * @author Hibernate Tools
 */
@Stateless
public class CommandeHome {

	private static final Log log = LogFactory.getLog(CommandeHome.class);
	private EntityManager entityManager;

	public void persist(Commande transientInstance) {
		log.debug("persisting Commande instance");
		try {
			entityManager.persist(transientInstance);
			entityManager.flush();
			log.debug("persist successful");
		} catch (RuntimeException re) {
			log.error("persist failed", re);
			throw re;
		}
	}
[...]

The error occurs line "entityManager.persist(transientInstance);" with a NPE. See the full stacktrace here. I checked on debug and my Commande object isn't null, so I guess it's coming from my Persistence Context, but I don't know what the problem is exactly. Any help is appreciated. Thanks.


EDIT : Nevermind, just forgot some annotations like another @EJB and @PersistenceContext...