Override AbstractFacade ?!

Hi, I am new to JEE programming and I have a newbie question for you.

I have generated Entities and Session/Stateless beans with Netbeans 6.9. Now I need to override the AbstractFacade, with some specific Entity manipulation. I have a ProjectFacade class that extends the AbstractFacade. I need to create/overload the create method. So I can set a TimeStamp on the Project Entity object before it gets persisted.

How would the function declaration look like if I override (I not sure of the syntax) ?

The AbstractFacade class

public abstract class AbstractFacade<T> {
    private Class<T> entityClass;

public AbstractFacade(Class<T> entityClass) {
        this.entityClass = entityClass;
    }

protected abstract EntityManager getEntityManager();

}
    public void create(T entity) {
        getEntityManager().persist(entity);
    }

public void edit(T entity) {
        getEntityManager().merge(entity);
    }

public void remove(T entity) {
        getEntityManager().remove(getEntityManager().merge(entity));
    }

public T find(Object id) {
        return getEntityManager().find(entityClass, id);
    }

public List<T> findAll() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        return getEntityManager().createQuery(cq).getResultList();
    }

public List<T> findRange(int[] range) {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        cq.select(cq.from(entityClass));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        q.setMaxResults(range[1] - range[0]);
        q.setFirstResult(range[0]);
        return q.getResultList();
    }

public int count() {
        javax.persistence.criteria.CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
        javax.persistence.criteria.Root<T> rt = cq.from(entityClass);
        cq.select(getEntityManager().getCriteriaBuilder().count(rt));
        javax.persistence.Query q = getEntityManager().createQuery(cq);
        return ((Long) q.getSingleResult()).intValue();
    }

}

The ProjectFacade class

Thanks.