Someone

public Long all() {
    try {
       Query user = em.createNativeQuery("Select count(*) FROM `sales`.`wuser`;");
       Long f = (Long) user.getSingleResult();
            return f; 
        } catch (NoResultException nre) {
            return null;
        }
}

    public Wuser[] getAll1() {
    try {
        int lol = Integer.parseInt(all().toString());
            Wuser[] user = new Wuser[lol+1];
            int i;
            for (i=1;i<=lol;i++){
                user[i] = (Wuser)
            em.createNamedQuery("Wuser.findById").
                    setParameter("id", i).getSingleResult(); 
            }
           
            return user; 
        } catch (NoResultException nre) {
            return null;
        }
}