Pass value from jTextField to NamedQuery

I have some jTextfFields where I need to send to DAO its values, these values are arriving correctly in DAO , however the return of NameQuery is being null . There is no error, only the return is null , consequently it does not write to the bank.

What's strange (for me) is that after a lot of trying, I decided to test and found that if I set the values so they already start filled in jTextField , the return of DAO is not null , but due return.

In the case below the "number" is the String that came from jTextField and was sent to DAO , and null is the return of NamedQuery . p>

numero recebido:  5555
dao: null

In this case, manually set to start the sout completed. The return is correct and writes to the bank.

numero recebido:  5555
dao: 5555

Below that I found it important to add so that someone can help in the question of why this behavior and help correct the errors that may be causing this, or even other errors. Thanks

jTextField Car

@Entity
@DynamicUpdate(value = true)
@NamedQueries({
    @NamedQuery(name = "Carro.findAll", query = "SELECT distinct c FROM Carro c"),
    @NamedQuery(name = "Carro.findByCarroId", query = "SELECT c FROM Carro c WHERE c.id = :id"),
    @NamedQuery(name = "Carro.findByCarroIdAndDescricao", query = "SELECT c FROM Carro c WHERE c.id = :id and c.numero = :numero"),
    @NamedQuery(name = "Carro.findByCarroNumero", query = "SELECT c FROM Carro c WHERE c.numero = :numero")})
public class Carro implements EntidadeBase, Serializable {

    private static final long serialVersionUID = 1L;
    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "idCarro")
    private Integer id;
    @Column(name = "numeroCarro")
    private String numero;

Method in Entidade to fetch the value of DAO

 public Carro buscarPorNumero(String numero) {
        System.out.println("NUMERO RECEBIDO: " + numero);
        EntityManager em = getEm();
        Carro carro = null;
        try {
            carro = (Carro) em.createNamedQuery("Carro.findByCarroNumero")
                    .setParameter("numero", numero)
                    .getSingleResult();

        } catch (NoResultException | NonUniqueResultException nre) {
            JOptionPane.showMessageDialog(null, nre.getMessage());
        }
        System.out.println("DAO: " + carro);

        return carro;

    }

Method to save, in jTextField , I left only the code related to the specific issue to not pollute much.

public void salvar() {
        CarroDao carroDao = new CarroDao();
        Locall locall = new Locall();
        Envio envio = new Envio();

        List<Carro> carros = new ArrayList();
        List<String> lista = new ArrayList();

        if (jTextField1.getText().trim().equals("") == false) {
            lista.add(jTextField1.getText());
            System.out.println("PRIMEIRO:" + jTextField1.getText());
        }
        if (jTextField2.getText().trim().equals("") == false) {
            lista.add(jTextField2.getText());
            System.out.println("SEGUNDO:" + jTextField2.getText());
        }
        if (jTextField3.getText().trim().equals("") == false) {
            lista.add(jTextField3.getText());
            System.out.println("TERCEIRO:" + jTextField3.getText());
        }
        if (jTextField4.getText().trim().equals("") == false) {
            lista.add(jTextField4.getText());
            System.out.println("QUARTO:" + jTextField4.getText());
        }


        for (int i = 0; i < lista.size(); i++) {
            carros.add((Carro) carroDao.buscarPorNumero(lista.get(i)));
            System.out.println("Carro adicionado: " + lista.get(i));

        }
        envio.setCarros(carros);   

        try {
            EnvioDao ci = new EnvioDao();
            ci.save(envio);
            JOptionPane.showMessageDialog(null, "Gravado !");
            modelo.limpaLista();
            preencherTabela();
        } catch (Exception erro) {
            JOptionPane.showMessageDialog(null, "Erro na Gravação:" + erro);
        }
        refresh();
        clearSelection();

    }

update1

if (jTextField1.getText().trim().equals("") == false) {
        lista.add(jTextField1.getText().trim());
        System.out.println("PRIMEIRO:" + jTextField1.getText());
    }