form

 Ligacao l = new Ligacao();
        l.setIp("192.168.2.139");
        l.setNome("Vinicius");
        l.setData(new java.sql.Date(new Date().getTime()));
        l.setCodigo(5121);
        l.setChamado1("SIM");
        l.setChamado2("NAO");
        l.setDestino("N1");
        l.setTransferencia("NAO");
        SessionFactory sf = new Configuration().configure().buildSessionFactory();

        try {
            Session session = sf.openSession();
            Transaction tx = session.beginTransaction();
            session.save(l);
            tx.commit();
            session.close();
            JOptionPane.showMessageDialog(null, "Registrado com sucesso!");
        } catch (ConstraintViolationException e) {
            JOptionPane.showMessageDialog(null, "Protocolo já existente na base de dados!");
        }