FlushMode of EntityManager

[tienlantri]

I have an abstract action who defines the conversation (start and end)

@AutoCreate
@Scope(ScopeType.CONVERSATION)
public abstract class MainAction {
    @In
    private EntityManager entityManager;

    @Create
    public void initComponent() {
        createConversation();
        logger.info("createAction");
        init();
    }

    private void createConversation() {
        Conversation.instance().begin();
        Conversation.instance().changeFlushMode(FlushModeType.MANUAL);
    }

    public void save() {
        logger.info("Commiting transaction");
        entityManager.flush();
        logger.info("Transaction commited");
        FacesMessages.instance().addFromResourceBundle(Severity.INFO,
                "general.saveMessage");
        endConversation();
        createConversation();
    }

    private void endConversation() {
        Conversation.instance().end(false);
    }

    public abstract void init();

    /**
     * Getteur de l'attribut entityManager.
     *
     * @return EntityManager la valeur de entityManager
     */
    public EntityManager getEntityManager() {
        return entityManager;
    }
}

All the actions for each screen extends from MainAction.
Eventhough in MainAction I start CONVERSATION with FlushMode type MANUAL, in each action (extends MainAction) I receive Flush type is null (Note that in GestionPrestActAction who extends MainAction, I retrieve EntityManager by using getEntityManager in MainAction). I don't understand why. And that's also the reason why when I modify something, the modification is committed directly to DB without waiting for entityManager.flush()

Here is the code of an action extends MainAction

@AutoCreate
@Scope(ScopeType.CONVERSATION)
@Name("gestionPrestAct")
public class GestionPrestActAction extends MainAction {
    @Logger
    private Log               logger;

    @Override
    public void init() {
        activiteToModif = new Activite();
        allActivites = activiteService.getAllActivites();
        initDataModel();
    }

    @SuppressWarnings("unchecked")
    @Factory(autoCreate = true, value = "prestationsAll")
    public void initDataModel() {
        logger.info("initDataModel");
        prestationsAll = prestationService.getAllPrestations();
        Collections.sort(prestationsAll, new Prestation.PrestationComparator());
        logger.info("Flush mode type " + getEntityManager().getFlushMode());
    }
}

Is there someone who could tell me the reason?
Thanks
Tina