TableModelListener ERROR in Java 2011

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Code:
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.table.*;
    import javax.swing.event.*;
    /**
     *
     * @author Pilu
     */
    public class Afisare extends javax.swing.JFrame implements ActionListener, TableModelListener {
     
    //private JButton getValue;
     
    private Vector<Vector<String>> data;
    private Vector<String> header;
    /** Creates new form Afisare */
    public Afisare() throws Exception {
    DBEngine dbengine = new DBEngine();
     
    DefaultTableModel tableModel;
    data = dbengine.getTabel();
    header = new Vector<String>();
    header.add("ID");
    header.add("Nume");
    header.add("Prenume");
    header.add("Pret");
    tableModel = new DefaultTableModel(data, header);
    tableModel.addTableModelListener( this );
     
    initComponents();
     
     
    }
    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
    // TODO add your handling code here:
    DefaultTableModel model = (DefaultTableModel) this.jTable2.getModel();
    int[] rows = jTable2.getSelectedRows();
    String connectionURL = "jdbc:mysql://localhost:3306/bazadedate";
    Connection connection;
    try{
    Class.forName("com.mysql.jdbc.Driver");
    connection = DriverManager.getConnection(connectionURL, "root", "123456");
    String query = "SELECT * FROM tabel ORDER BY id DESC LIMIT 1" ;
    Statement st = connection.createStatement();
    ResultSet result = st.executeQuery(query);
    String textField1 = jTextField1.getText();
    String textField2 = jTextField2.getText();
    String textField3 = jTextField3.getText();
    while(result.next()){
    int lastRowValue = result.getInt("id");
    model.addRow(new Object[]{(lastRowValue+1),textField1,textField2,textField3});
    st.executeUpdate("INSERT INTO tabel (nume,prenume,pret) VALUES ('"+textField1+"','"+textField2+"','"+textField3+"')");
    }
    }
    catch(Exception e){
    System.out.println("The exception is " + e);
    }
    }
     
     
     
    public void tableChanged( TableModelEvent e ) {
     
    DefaultTableModel model = (DefaultTableModel)e.getSource();
    int row = e.getFirstRow();
    int column = e.getColumn();
    String cellValue = String.valueOf( model.getValueAt(row, column) );
    System.out.println("Value at (" + row + "," + column + ") changed to " + "'" + cellValue + "\'");
    }
     
     
    public void actionPerformed( ActionEvent evt ) {
     
    DefaultTableModel model = (DefaultTableModel)evt.getSource();
    int row = jTable2.getSelectedRow();
    int column = jTable2.getSelectedColumn();
     
    if ( evt.getSource() == jButton3 ) {
    String value = (String) model.getValueAt(row,column) ;
    System.out.println("Value at (" + row + "," + column + ") is " + "\'" + value + "\'");
    }
    }
    public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    try
    {
    new Afisare().setVisible(true);
     
    }catch(Exception e){e.printStackTrace();}
    }
    });
     
    }