Populating JList

Question

I want to dinamically populate a JList (lstDetalhes) on start up.
I'm using a method to do it; this method needs to read a selected value from another JList (lstTurmas) that is also loaded at startup.
here's the method:
    javax.swing.DefaultListModel lm;
    public javax.swing.DefaultListModel q10Escolhidos() throws Exception {
        System.out.println("in?cio");
        javax.swing.DefaultListModel lm = new javax.swing.DefaultListModel();
        Configuration cfg = null;
        try {
            cfg = new Configuration()
                  .addClass(Turma.class)
                  .addClass(Relatorio.class)
                  .addClass(Disciplina.class)
                  .addClass(Detalhe.class);
        catch (MappingException ex) {
        SessionFactory sf = null;
        try {
            sf = cfg.buildSessionFactory();
        catch (HibernateException ex1) {
        Session sess = null;
        try {
            sess = sf.openSession();
        catch (HibernateException ex2) {
        Transaction t = null;
        try {
            t = sess.beginTransaction();
        catch (HibernateException ex3) {
        String s = (String) visual.lstTurmas.getSelectedValue();
        System.out.println("o que est? seleccionado na lista das turmas: " + s); // that's where prints NULL
        LeLista ll = new LeLista();
        //int oano = ll.oAno(s);
        //System.out.println("O ano ? :" + oano);
        int oano=4;//++++++ tinha de throws exception
        //String aturma = ll.aTurma(s);
        //System.out.println("A truma  ? :" + aturma);
        String aturma ="A";
        aturma = "" + "'" + aturma + "'";
        String query =
            "select rel from Relatorio as rel where rel.turma.ano = " + oano +
            " AND turma = " + aturma;
        List lista = null;
        try {
            lista = sess.find(query);
        catch (HibernateException ex4) {
        rel = (Relatorio) lista.get(0);        
        lm.addElement(rel.getTurma().getDetalhe());
        return lm;
}Inside this method i call leLista:
public class LeLista {
    public LeLista() {
    //obter a turma
    public String aTurma(String s) {
        String a = s.substring(3);
        //System.out.println("a turma: " + a.trim());
        a = a.trim();
        return a;
    //obter o ano
    public int oAno(String s) {
        String a = s.substring(0, 1);
        a = a.trim();
        int b = Integer.parseInt(a);
        //System.out.println("o ano " + b);
        return b;
}Basically i'm using two classes: Assistente.java - the brain of my app - (from which the above method belongs) and VisualSwing.java - where visual components are created, etc.
As i had trouble initializing my JList's listModel, i created this mehtod that is written inside VisualSwing.java:
    Assistente assistente = new Assistente(this);
    public javax.swing.DefaultListModel q10Escolhidos() {
        try {
            info2 = assistente.q10Escolhidos();
        catch (Exception ex) {
            System.out.println("Erro de q10Escolhidos");
        return info2;
    DefaultListModel info2 = new DefaultListModel();Now - to my problem: if i try it just like the code above - manually saying which ANO and TURMA i wanted the REL loaded, its ok;
What happens is that i dont want it like that - i want it dinamically generated.
I wrote some print msg:
System.out.println("o que est? seleccionado na lista das turmas: " + s);
but says...null
This means that when this method goes searching for the selected value in lstTurmas, its not yet loaded, so gives... null.
How can i solve this?
thanks a lot in advance

Answer 1

case solved!
i split the listmodel generator method in two: one creates the listmodel, while the second later adds whatever i want to it