Thread: Refreshing JTable!!

Hi, I hope you are fine, I got a doubt.......it's just that I have a defaulttablemodel and jtable where I get information from my DB, the problem is that I got another windows to add the information, it's a windows with a JTextField and JLabel and button...well my problem is that when I add information to the DB my "QUERY" runs without any problem, but I don't know how to do for refreshing my JTable because if I have my JTable opened, it doesn't refresh, and when I close it and I open it again, I get all the new informations

I've been trying with a lots of methods like:
fireTableDataChanged();
.fireTableStructureChanged();
.updateUI();
.revalidate();

But nothing, it seems to work, I don't know why :S
this is my code, if anybody has a suggetion, pls let me know and I will really thank you:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.table.DefaultTableModel;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
 
public class teoriasDatos extends JFrame implements ActionListener, TableModelListener{
 
    private final String[] titulos = {"Teoria", "Autor", "Fecha", "Ciencia", "Id"};
 
    private JMenuBar barra;
    private JMenu archivo, edicion;
    private JMenuItem salir, buscar, modificar, eliminar, seleccionar;
    private DefaultTableModel dtm = new DefaultTableModel();
    private JTable tabla = new JTable(dtm);
    private JScrollPane scroll = new JScrollPane(tabla);
 
    private List<Integer> lista = new ArrayList<Integer>(); 
    conexion cn = new conexion();
 
    public teoriasDatos(){
        super("Teorias System");
        this.setLayout(null);
        this.setSize(900, 460);
        this.setResizable(false);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.Objetos();
        this.setVisible(true);
    }
 
 
 
    public void Objetos(){
        barra = new JMenuBar();
        archivo = new JMenu("Archivo");
        edicion = new JMenu("Edicion");
        buscar = new JMenuItem("Buscar");
        modificar = new JMenuItem("Modificar");
        eliminar = new JMenuItem("Eliminar");
        seleccionar = new JMenuItem("Seleccionar");
        salir = new JMenuItem("Salir");
        barra.add(archivo);
        barra.add(edicion);
        archivo.add(salir);
        edicion.add(buscar);
        edicion.add(modificar);
        edicion.add(eliminar);
        edicion.addSeparator();
        edicion.add(seleccionar);
        this.setJMenuBar(barra);
 
 
 
 
        dtm.setColumnIdentifiers(titulos);
        lista.clear();
 
        try{
             ResultSet aux = cn.getSt().executeQuery("SELECT*FROM datos");
             while(aux.next()){
 
                 Object [] fila = {aux.getObject(1), aux.getObject(2), aux.getObject(3), 
                     aux.getObject(4), aux.getObject(5)};
                 lista.add((Integer)aux.getObject(5));
                 dtm.addRow(fila);
 
             }
 
        }catch(SQLException ioe){
      JOptionPane.showMessageDialog(null, "Error al leer teorias: " + ioe);
        }
 
 
        scroll.setBounds(0, 0, 900, 460);
        this.add(scroll);
 
        salir.addActionListener(this);
        buscar.addActionListener(this);
        modificar.addActionListener(this);
        eliminar.addActionListener(this);
        seleccionar.addActionListener(this);
        dtm.addTableModelListener(tabla);
 
 
 
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==buscar){
            try{
                int i = Integer.parseInt(JOptionPane.showInputDialog("ID de la teoria a buscar"));
                ResultSet resultado = cn.buscar(i);
                tabla.changeSelection(i-1, i, false, false);
 
            }catch(Exception ioe){
                JOptionPane.showMessageDialog(null, "Deber un introducir el ID " +ioe);
            }
        }else if(e.getSource() == modificar){
 
            try{
                int i = Integer.parseInt(JOptionPane.showInputDialog("ID de la teoria a modificar"));
                ResultSet resultado = cn.buscar(i);
                if(resultado.next()){
                    String au = JOptionPane.showInputDialog("Autor");
                    String an = JOptionPane.showInputDialog("Año");
                    String cie = JOptionPane.showInputDialog("Ciencia");
 
                    if(au.isEmpty()){
                        JOptionPane.showMessageDialog(null, "Debes rellenar todos los campos");
 
                    }else if(an.isEmpty()){
                        JOptionPane.showMessageDialog(null, "Debes rellenar todos los campos");
                    }else if(cie.isEmpty()){
                        JOptionPane.showMessageDialog(null, "Debes rellenar todos los campos");
                    }else{
                      cn.modificar(i, au, an, cie);
 
                    }
                }
            }catch(Exception ioe){
                JOptionPane.showMessageDialog(null, "Error al modificar datos: " +ioe);
            }
 
 
        }else if(e.getSource() == eliminar){
            this.delectRows(tabla.getSelectedRows());
            tabla.clearSelection();
 
        }else if(e.getSource() == seleccionar){
            tabla.selectAll();
        }
 
    }
 
    public void delectRows(int[] rowSelected){
        for (int i = 0; i<rowSelected.length; i++){
            String query = "DELETE FROM datos WHERE IDE="+lista.get(rowSelected[i]);
            try{
                cn.getSt().executeUpdate(query);
            }catch(SQLException sqle){
                JOptionPane.showMessageDialog(null, "Error al eliminar teoria " +sqle);
            }
        }
    }
 
 
    public void tableChanged(TableModelEvent tme) {
 
    }
 
}

You should update the default table model. I don't see where you do that in your code.