[JTable] Problème d'accés

 private void initComponents() {

        mainPanel = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jTabbedPane1 = new javax.swing.JTabbedPane();
        jScrollPane3 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTabbedPane2 = new javax.swing.JTabbedPane();
        //Création de la JTable
        Vector<String> rowOne = new Vector<String>();
        rowOne.addElement("udp:192.168.1.64/161");

        Vector<Vector> rowData = new Vector<Vector>();
        rowData.addElement(rowOne);

        Vector<String> columnNames = new Vector<String>();
        columnNames.addElement("Hôtes Découvets");

        JTable table = new JTable(rowData,columnNames);

        //Test ajout de ligne
        DefaultTableModel mod = (DefaultTableModel)table.getModel();
        Vector<String> row2 = new Vector<String>();
        row2.addElement("udp:192.168.1.254/161");
        mod.addRow(row2);
        table.setModel(mod);
        table.validate();

        //Création du JScrollPane
        jScrollPane1 = new javax.swing.JScrollPane(table);
        ............
        }