Load data to a Java form from sql

I'm trying to load previously stored data in a bd to a Java form

What I want to achieve is that by selecting a list from the combobox load all the corresponding data (name, age, phone)

My problem: When selecting a rut from the list, the other fields do not change, they remain with the values corresponding to the first rut shown

The data is well saved, since I have a file in which I show, update and delete

I insert my method:

private void cbrutcActionPerformed(java.awt.event.ActionEvent evt) {                                       
    try {
    String rut = cbrutc.getSelectedItem().toString();
    String sql = "SELECT * "
            + "FROM  cliente "
            + "WHERE  rut =  '" + rut + "';";

        Conex cn = new Conex();
        ResultSet rs = cn.consulta();

        while (rs.next()) {
            String nm = rs.getString("nombre");
            String ed = rs.getString("edad");
            String tl = rs.getString("telefono");

            tfnombrec.setText(nm);
            tfedadc.setText(ed);
            tftelefonoc.setText(tl);

            tfmontoc.requestFocus();

        }

    } catch (Exception e) {
        System.out.println(e);
    }