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`
// init Data Model
        private void initDataModel(){
        System.out.println("DEBUG START FORM >>> ");
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("ServiciiJPA");
        em = emf.createEntityManager();
        List<Client> lst = em
        .createQuery("SELECT c FROM Client c ORDER BY c.id", Client.class)
        .getResultList();
        clienti.addAll(lst);
        if (lst != null && !lst.isEmpty()){
        Collections.sort(this.clienti, (c1, c2) ->  c1.getId().compareTo(c2.getId()));
        this.client = clienti.get(0);
        System.out.println("DEBUG: client init >>> " + client.getId());
        }

我在Eclipse中尝试过，但从未解决。