JTable row deletion deleting valuable information --need HELP

Question

Hi Experts and Java Programmers,
I am posting the code that works 99% of the time. It basically creates a JTable and has row insertion and row deletion methods. The row insertion works fine. However, when a row N is deleted it causes the loss of data in the row N+1's cell in whichever cell the cursor is blinking. In other words, when cursor is in cell M of row N, row deletion sets the cell M of row N+1 to blank. So if the cursor is on the 2nd cell of 1st row and if 1st row is deleted, the data in the 2nd cell of 2nd row (now moved to 1st row) is lost.
Thanks for your help.
Murthy
package trunkxref;
*  Copyright 1999-2002 Matthew Robinson and Pavel Vorobiev.
*  All Rights Reserved.
*  ===================================================
*  This program contains code from the book "Swing"
*  2nd Edition by Matthew Robinson and Pavel Vorobiev
*  http://www.spindoczine.com/sbe
*  ===================================================
*  The above paragraph must be included in full, unmodified
*  and completely intact in the beginning of any source code
*  file that references, copies or uses (in any way, shape
*  or form) code contained in this file.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import java.text.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.net.*;
public class trnk
//extends JFrame
  public JTable m_table;
  public TrunkReportData m_data;
  public JLabel m_title;
  public JLabel m_title2;
  public InputStream is;
  Image imginsert, imgdel, imgup, imgdown, imgsav;
  URL jspURL;
  JApplet applet;
  public trnk ( JApplet applet,InputStream is, Image imginsert, Image imgdel, Image imgup, Image imgdown, Image imgsav, URL jspURL)
    //super ("Trunks Data");
    //setSize (600, 300);
    this.applet=applet;
    this.is=is;
    this.imginsert=imginsert;
    this.imgdel=imgdel;
    this.imgup=imgup;
    this.imgsav=imgsav;
    this.imgdown=imgdown;
    this.jspURL=jspURL;
    UIManager.put("Table.focusCellHighlightBorder",
            new LineBorder(Color.black, 0));
    m_data = new TrunkReportData (this,imgup, imgdown);
    m_title = new JLabel(m_data.getTitle(),
                null, SwingConstants.LEFT);
    m_title2 = new JLabel("(Please make sure to hit TAB or ENTER after making changes to a cell)",
                null, SwingConstants.LEFT);
    m_title.setFont(new Font("Helvetica",Font.PLAIN,24));
    m_title2.setFont(new Font("Helvetica",Font.PLAIN,12));
           Color bg=new Color(200,100,30);
           //setBackground(header.getBackground());
           m_title.setBackground(bg);
           m_title.setForeground(Color.white);
           m_title2.setBackground(bg);
           m_title2.setForeground(Color.yellow);
    //getContentPane().add(m_title, BorderLayout.NORTH);
    m_table = new JTable ();
     m_table.putClientProperty( "JTable.autoStartsEdit", new Boolean( false ) );
     //m_table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
    m_table = new JTable () {
          public boolean processKeyBinding(KeyStroke ks, KeyEvent e, int condition, boolean pressed) {     
               if (e.getKeyChar()==KeyEvent.CHAR_UNDEFINED)
                    return false;     
               return super.processKeyBinding(ks,e,condition,pressed);             }
    m_table = new JTable () {
     protected void processKeyEvent(KeyEvent e)     {     
           if ( (e.getKeyCode() == KeyEvent.VK_ENTER ||
               e.getKeyCode() == KeyEvent.VK_TAB) &&  
               e.getID() == KeyEvent.KEY_PRESSED ){
                    if(m_table.isEditing()) {
                         m_table.getCellEditor().stopCellEditing();
                         int row = m_table.getEditingRow();
                         int col = m_table.getEditingColumn();
                         col++; // actually check col > number of columns
                         m_table.editCellAt(row,col);
                         //m_table.transferFocus();
                    } else {
                         int col = m_table.getSelectedColumn() + 1;
                         int row = m_table.getSelectedRow();
                         m_table.clearSelection();
                         col++; // actually check col > number of columns
                         m_table.editCellAt(row,col);
                         //m_table.transferFocus();
                            //m_table.setRowSelectionInterval(row, row);
                            //m_table.setColumnSelectionInterval(column, column);               
                         //m_table.scrollRectToVisible( m_table.getCellRect(row, column, true) );          
          }     else           {               
               super.processKeyEvent(e);           
     //m_table.setSurrendersFocusOnKeystroke(true);
     //m_table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);
     m_table.addFocusListener(new FocusListener() {
          public void focusGained(FocusEvent e){
          public void focusLost(FocusEvent e){
                    if(m_table.isEditing()) {
                         m_table.getCellEditor().stopCellEditing();
    m_table.setAutoCreateColumnsFromModel (false);
    m_table.setModel (m_data);
    m_table.setSelectionMode (ListSelectionModel.SINGLE_SELECTION);
    for (int k = 0; k < m_data.getColumnCount (); k++)
     TableCellRenderer renderer = null;
     TableCellEditor editor = null;
     renderer = new TextAreaCellRenderer ();     // NEW
     editor = new TextAreaCellEditor (m_table, m_data);
     TableColumn column = new TableColumn (k,
                               TrunkReportData.m_columns[k].m_width,
                               renderer, editor);
     column.setHeaderRenderer(createDefaultRenderer());
     m_table.addColumn (column);
    JTableHeader header = m_table.getTableHeader ();
    header.setUpdateTableInRealTime (false);
    header.addMouseListener(new ColumnListener());
    header.setReorderingAllowed(true);
    //JScrollPane ps = new JScrollPane ();
    //ps.getViewport ().setBackground (m_table.getBackground ());
    //ps.setSize (550, 150);
    //ps.getViewport ().add (m_table);
    //getContentPane ().add (ps, BorderLayout.CENTER);
    //JToolBar tb = createToolbar ();
    //getContentPane ().add (tb, BorderLayout.NORTH);
    //JPanel p = new JPanel (new GridLayout (1, 2, 5, 5));
    //getContentPane ().add (p, BorderLayout.SOUTH);
  } //constructor trnk
  protected TableCellRenderer createDefaultRenderer() {
    DefaultTableCellRenderer label = new DefaultTableCellRenderer()
     public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
       if (table != null) {
         JTableHeader header = table.getTableHeader();
         if (header != null) {
           //setForeground(header.getForeground());
           setForeground(Color.white);
           Color bg=new Color(200,100,30);
           //setBackground(header.getBackground());
           setBackground(bg);
           setFont(header.getFont());
       setText((value == null) ? "" : value.toString()) ;
       setBorder(UIManager.getBorder("TableHeader.cellBorder"));
       return this;
    label.setHorizontalAlignment(JLabel.CENTER);
    return label;
  } //table cell renderer
  public JToolBar createToolbar ()
    JToolBar tb = new JToolBar ();
    tb.setFloatable (false);
           Color bg=new Color(200,100,30);
           //setBackground(header.getBackground());
           tb.setBackground(bg);
    JButton bt = new JButton (new ImageIcon (imginsert));
    //JButton bt = new JButton ("Insert");
    bt.setToolTipText ("Insert Row");
    bt.setRequestFocusEnabled (false);
    ActionListener lst = new ActionListener (){
      public void actionPerformed (ActionEvent e) {
     int nRow = m_table.getSelectedRow() + 1;
     m_data.insert (nRow);
     m_table.tableChanged (new TableModelEvent
                     (m_data, nRow, nRow, TableModelEvent.ALL_COLUMNS,
                      TableModelEvent.INSERT));
     m_table.setRowSelectionInterval (nRow, nRow);
    bt.addActionListener ((ActionListener)lst);
    tb.add (bt);
    bt = new JButton (new ImageIcon (imgdel));
    //bt = new JButton ("Delete");
    bt.setToolTipText("Delete Row");
    bt.setRequestFocusEnabled(false);
    lst = new ActionListener ()
     public void
       actionPerformed
       (ActionEvent e)
         int nRow = m_table.getSelectedRow();
          if (nRow  < 0)
           JOptionPane.showMessageDialog( null,  "Please select a row to delete",  "Error", JOptionPane.ERROR_MESSAGE);
          else
          if (JOptionPane.showConfirmDialog(null, "Do you want to delete the selected row?", "Delete a Row", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION)
         if (m_data.delete (nRow))
          m_table.getCellEditor().stopCellEditing();
          m_table.tableChanged
            (new TableModelEvent
             (m_data, nRow, nRow,
              TableModelEvent.ALL_COLUMNS,
              TableModelEvent.DELETE));
          //m_table.clearSelection();
    bt.addActionListener(lst);
    tb.add (bt);
    bt = new JButton (new ImageIcon (imgsav));
    //bt = new JButton ("Save");
    bt.setToolTipText("Save");
    bt.setRequestFocusEnabled(false);
    lst = new ActionListener ()
     public void
       actionPerformed
       (ActionEvent e)
         m_table.tableChanged (new TableModelEvent
                      (m_data));
         //m_data.fireTableDataChanged();
         //System.out.println("beginning to write data to" + jspURL.toString());
         //code to save data to file
          //final Component top=(trnk)this.getTopLevelAncestor();
          //final Component top=(trnk)super.;
          //final Cursor lOrigCursor =(Cursor) super.getCursor();
          //final Cursor lOrigCursor = getCrsr();
          //top.setCursor( Cursor.getPredefinedCursor( Cursor.WAIT_CURSOR ) );
          setWaitCursor();
          Thread lSavThread= new Thread() {
               public void run()
                    savefile(m_data, jspURL);
                    //top.setCursor( lOrigCursor );
                    setNormalCursor();
          lSavThread.start();
    bt.addActionListener(lst);
    tb.add (bt);
    return tb;
  } //create tool bar
  public void setWaitCursor()
          applet.getGlassPane().setVisible(false);
          applet.getGlassPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
  public void setNormalCursor()
          applet.getGlassPane().setVisible(true);
          applet.getGlassPane().setCursor(Cursor.getDefaultCursor());
  public void savefile(TrunkReportData m_data, URL jspURL)
         String txt="";
         Enumeration enum=m_data.m_vector.elements();
         while(enum.hasMoreElements())
          TrunkData trnk = (TrunkData)enum.nextElement();
          txt += trnk.m_sysname + " , "
+ trnk.m_clli + " , "
+ trnk.m_tg + " , "
+ trnk.m_member.intValue() + " , "
+ trnk.m_trunk_type + " , "
+ trnk.m_lata + " , "
+ trnk.m_lata_name + " , "
+ trnk.m_prospect_server + " , "
+ trnk.m_tgroupid + " , "
+ trnk.m_ctg + " , "
+ trnk.m_augmen.intValue() + " , "
+ trnk.m_vendor + "\n";
         try {
           URLConnection jspCon=jspURL.openConnection();
           jspCon.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
           jspCon.setUseCaches(false);
           jspCon.setDoOutput(true);
           PrintStream out = new PrintStream(jspCon.getOutputStream());
           String postData= "Text=" + URLEncoder.encode(txt, "UTF-8");
           out.println(postData);
           out.flush();
           out.close();
           InputStreamReader in=new InputStreamReader(jspCon.getInputStream());
           int chr;
           while((chr=in.read()) != -1) {}
           in.close();
         } catch (Exception e2) {
           System.out.println (" exception in writing data out "
+ e2.toString());
         //System.out.println("done write data");
  // NEW
  class ColumnListener extends MouseAdapter {
    public void mouseClicked(MouseEvent e) {
      TableColumnModel colModel = m_table.getColumnModel();
      int columnModelIndex = colModel.getColumnIndexAtX(e.getX());
      int modelIndex = colModel.getColumn(columnModelIndex).getModelIndex();
      if (modelIndex < 0)
     return;
      if (m_data.m_sortCol == modelIndex)
     m_data.m_sortAsc = !m_data.m_sortAsc;
      else
     m_data.m_sortCol = modelIndex;
      for (int i=0; i < m_data.getColumnCount(); i++) {
     TableColumn column = colModel.getColumn(i);
     int index = column.getModelIndex();
     JLabel renderer = (JLabel)column.getHeaderRenderer();
     renderer.setIcon(m_data.getColumnIcon(index));
      m_table.getTableHeader().repaint();
      m_data.sortData();
      m_table.tableChanged(new TableModelEvent(m_data));
      m_table.repaint();
  } //column listener
} //class trnk
class TextAreaCellRenderer extends JTextArea implements TableCellRenderer
  protected static Border m_noFocusBorder    =    new
  EmptyBorder (1,           1,           1,           1);
  protected static    Border    m_focusBorder =
  UIManager.getBorder("Table.focusCellHighlightBorder");
  public
  TextAreaCellRenderer
    setEditable
      (false);
    setLineWrap
      (true);
    setWrapStyleWord
      (true);
    setBorder
      (m_noFocusBorder);
  public Component
  getTableCellRendererComponent
  (JTable table,
   Object value,
   boolean
   isSelected,
   boolean
   hasFocus,
   int nRow, int nCol)
    Color fg=new Color(255,0,0);
    //ColorData cvalue = new ColorData(value);
    setForeground(fg);
    if (value       instanceof       String)
      setText ((String) value);
    else if (value instanceof Integer)
      setText((String)value.toString());
     setBackground
      (isSelected && !hasFocus ?      table.getSelectionBackground() : table.getBackground ());
    //setForeground (isSelected && !hasFocus ?
    //      table.getSelectionForeground() : table.getForeground ());
    setFont (table.getFont ());
    setBorder (hasFocus ? m_focusBorder : m_noFocusBorder);
     causes looping and stops rendering the components surrounding
     the cells
    // Adjust row's
    // height
    //int width =
     // table.getColumnModel().getColumn(nCol).getWidth ();
    //setSize (width,
//          1000);
    int rowHeight =     getPreferredSize().height;
    if (table.getRowHeight(nRow) <  rowHeight)
      table.setRowHeight (nRow,  rowHeight);
     //table.setRowHeight(nRow, 20);
    return this;}
  // To fix JDK bug
  public String getToolTipText (MouseEvent event)
    return null;
} //class text area cell renderer
// NEW
class TextAreaCellEditor extends AbstractCellEditor implements
TableCellEditor
  public static int CLICK_COUNT_TO_EDIT = 1;
  protected JTextArea m_textArea;
  protected JScrollPane m_scroll;
  public TextAreaCellEditor (JTable t_table, TrunkReportData t_tablemodel)
     final JTable table=t_table;
     final TrunkReportData tablemodel =t_tablemodel;
    m_textArea = new JTextArea () {
     protected void processKeyEvent(KeyEvent e)     {     
               //if (e.getKeyChar()==KeyEvent.CHAR_UNDEFINED)
               // return ;
           if ( (e.getKeyCode() == KeyEvent.VK_ENTER ||
               e.getKeyCode() == KeyEvent.VK_TAB)&&  
               e.getID() == KeyEvent.KEY_PRESSED ){
               int row = table.getEditingRow();
               int col = table.getEditingColumn();
               col++; // actually check col > number of columns
               if (col == tablemodel.getColumnCount())
                    row++;
                    if (row == tablemodel.getRowCount())
                    row=0;
                    col=0;
               stopCellEditing();
               table.editCellAt(row,col);
               table.transferFocus();
          }     else if ( (e.getKeyCode() == KeyEvent.VK_DOWN ||
               e.getKeyCode() == KeyEvent.VK_UP ) &&
               e.getID() == KeyEvent.KEY_PRESSED ){
               int row = table.getEditingRow();
               int col = table.getEditingColumn();
               if ( e.getKeyCode() == KeyEvent.VK_UP)
               row--;
               if ( e.getKeyCode() == KeyEvent.VK_DOWN)
               row++;
               if (col == tablemodel.getColumnCount())
                    row++;
                    if (row == tablemodel.getRowCount())
                    row=0;
                    col=0;
               stopCellEditing();
               table.editCellAt(row,col);
               table.transferFocus();
          }     else
               super.processKeyEvent(e);           
    m_textArea.setLineWrap (true);
    m_textArea.setWrapStyleWord (true);
    m_scroll = new JScrollPane (m_textArea,
                    //JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                    JScrollPane.VERTICAL_SCROLLBAR_NEVER,
                    //JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
                    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
  public Component
  getTableCellEditorComponent
  (JTable table,
   Object value,
   boolean
   isSelected,
   int nRow, int nCol)
    //m_textArea.setBackground(table.getBackground());
    m_textArea.setBackground(Color.green);
    //m_textArea.setForeground(table.getForeground());
    m_textArea.setForeground(Color.black);
    m_textArea.setFont (table.getFont());
    m_textArea.setText (value   ==   null ?   "" :  value.toString());
    return m_scroll;
  public Object getCellEditorValue ()
    return       m_textArea.getText ();
  JTextArea getCellEditor ()
    return       m_textArea;
  public boolean isCellEditable (EventObject anEvent)
    if (anEvent   instanceof         MouseEvent)
     int click = ((MouseEvent) anEvent).getClickCount();
     return click >= CLICK_COUNT_TO_EDIT;
    return true;
} //class text area cell editor
class TrunkData
  public String    m_sysname;
  public String    m_clli;
  public String    m_tg;
  public Integer     m_member;
  public String    m_trunk_type;
  public String    m_lata;
  public String    m_lata_name;
  public String    m_prospect_server;
  public String    m_tgroupid;
  public String    m_ctg;
  public Integer   m_augmen;
  public String    m_vendor;
  public TrunkData ()
    m_sysname = "";
    m_clli = "";
    m_tg = "";
    m_member =     new Integer (0);
    m_trunk_type =     "";
    m_lata = "";
    m_lata_name =       "";
    m_prospect_server       = "";
    m_tgroupid = "";
    m_ctg = "";
    m_augmen = new Integer(0);
    m_vendor = "";
  public
  TrunkData
  (String sys,
   String clli,
   String tg,
   String member,
   String ttyp,
   String lata,
   String latanm,
   String pserver,
   String tgrpid,
   String ctg,
   String aug,
   String vend)
    m_sysname = sys;
    m_clli = clli;
    m_tg = tg;
    try {
      if (member.trim().equals(""))
     m_member=new Integer(0);
      else
     m_member =     new Integer(member.trim());
    } catch (Exception e) {
      System.out.println("can't parse member " + e.toString());
    m_trunk_type =     ttyp;
    m_lata = lata;
    m_lata_name =     latanm;
    m_prospect_server     = pserver;
    m_tgroupid =     tgrpid;
    m_ctg = ctg;
    if (aug.trim().equals(""))
      m_augmen=new Integer(0);
    else m_augmen=new Integer(aug.trim());
    m_vendor = vend;
} //class trunkd data
class ColumnData
  public String    m_tolatLbl;
  int m_width;
  int m_alignment;
  public    ColumnData    (String title,     int width,     int alignment)
    m_tolatLbl =     title;
    m_width = width;
    m_alignment =     alignment;
} //class column data
class  TrunkReportData  extends  AbstractTableModel
  public static ImageIcon COLUMN_UP;
  public static ImageIcon COLUMN_DOWN;
  public int               m_sortCol = 0;
  public boolean m_sortAsc = true;
  public static      final ColumnData      m_columns[] =
    new      ColumnData      ("System", 200,       JLabel.LEFT),
    new      ColumnData      ("CLLI", 200,       JLabel.LEFT),
    new      ColumnData      ("Trunk Group",       200,       JLabel.LEFT),
    new      ColumnData      ("Members", 200,       JLabel.LEFT),
    new      ColumnData      ("Trunk Type",       200,       JLabel.LEFT),
    new      ColumnData      ("LATA ", 200,       JLabel.LEFT),
    new      ColumnData      ("LATA Name",       200,       JLabel.LEFT),
    new      ColumnData      ("Prospect Server",       200,       JLabel.LEFT),
    new      ColumnData      ("Trunk Group ID",       200,       JLabel.LEFT),
    new      ColumnData      ("CTG", 200,       JLabel.LEFT),
    new      ColumnData      ("Augments", 200,       JLabel.LEFT),
    new      ColumnData      ("Vendor", 200,       JLabel.LEFT)
  protected      trnk m_parent;
  protected Vector      m_vector;
  public TrunkReportData (trnk parent , Image imgup, Image imgdown)
    this.COLUMN_UP=new ImageIcon(imgup);
    this.COLUMN_DOWN=new ImageIcon(imgdown);
    m_parent = parent;
    m_vector = new Vector ();
    setDefaultData (parent.is);
  public void setDefaultData (InputStream is)
    m_vector =  new Vector ();
    int numFields =       0;
    try
     BufferedReader
       br =new     BufferedReader(new InputStreamReader(is));
     String inline ="";
     while ((inline =  br.readLine()) != null)
         if (inline.indexOf('#') > -1)
          continue;
         StringTokenizer st = new StringTokenizer (inline, ",");
         String nsys=st.nextToken ().trim(); //sys
         String nclli=  st.nextToken().trim() ;     // clli
         String ntg= st.nextToken ().trim();     // tg
         String nmemb=  st.nextToken().trim();     // members
         String nttyp=   st.nextToken ().trim();     // trunktype
         String nlata= st.nextToken ().trim();     // lata
         String nlataname=  st.nextToken ().trim();     // lata  name
         String npros=    st.nextToken ().trim();     // prospect  server
         String ntgrpid=st.nextToken().trim();      //tgroupid
         String nctg=st.nextToken().trim();      //ctg
         String naug=st.nextToken().trim();      //augments
         String nvend=st.nextToken().trim();      //vendor
         m_vector.addElement(new TrunkData(nsys,nclli, ntg,
                               nmemb, nttyp, nlata, nlataname, npros, ntgrpid, nctg,
                               naug,nvend));
     br.close ();}
    catch (Exception e)
     System.out.println("Error in file reader 2 "+ e.toString ());
    sortData();
  public Icon getColumnIcon(int column) { // NEW
    if (column==m_sortCol)
      return m_sortAsc ? COLUMN_UP : COLUMN_DOWN;
    return null;
  // NEW
  public void sortData() {
    Collections.sort(m_vector, new
               TrunkComparator(m_sortCol, m_sortAsc));
  public int getRowCount ()
    return m_vector == null ? 0 : m_vector.size ();
  public int getColumnCount ()
    return    m_columns.length;
  public String getColumnName(int nCol)
    return    m_columns[nCol]. m_tolatLbl;
  public boolean isCellEditable
  (int nRow, int nCol)
    return true;
  public Object getValueAt (int         nRow,         int nCol)
    if (nRow < 0 || nRow >=getRowCount())
      return "";
    TrunkData row = (TrunkData) m_vector.elementAt(nRow);
    switch (nCol)
      case 0:
     return row.m_sysname;
      case 1:
     return row.m_clli;
      case 2:
     return row.m_tg;
      case 3:
     return row.m_member;
      case 4:
     return row.m_trunk_type;
      case 5:
     return row.m_lata;
      case 6:
     return row.m_lata_name;
      case 7:
     return row.m_prospect_server;
      case 8:
     return row.m_tgroupid;
      case 9:
     return row.m_ctg;
      case 10:
     return row.m_augmen;
      case 11:
     return row.m_vendor;
    return "";
  public void setValueAt (Object value, int nRow, int nCol)
    if (nRow < 0
     || nRow >=
     getRowCount
     || value ==
     null)
      return;
    System.out.println("setting nrow=" + nRow + " nCol=" + nCol + " to value=" + (String) value);
    TrunkData row = (TrunkData) m_vector.elementAt (nRow);
    String svalue = value.toString ();
    switch (nCol)
      case 0:
     row.m_sysname = svalue; break;
      case 1:
     row.m_clli = svalue; break;
      case 2:
     row.m_tg = svalue; break;
      case 3:
     if (svalue.trim().equals(""))
       row.m_member=new Integer(0);
     else
         try {
           row.m_member = new Integer(svalue.trim());
         } catch (NumberFormatException e) {
           JOptionPane.showMessageDialog( null,  "Please enter integer valuesonly.",  "Error", JOptionPane.ERROR_MESSAGE);
       break;
      case 4:
     row.m_trunk_type = svalue; break;
      case 5:
     row.m_lata = svalue; break;
      case 6:
     row.m_lata_name = svalue; break;
      case 7:
     row.m_prospect_server = svalue; break;
      case 8:
     row.m_tgroupid = svalue; break;
      case 9:
     row.m_ctg = svalue; break;
      case 10:
          if (svalue.trim().equals("")) {
               row.m_augmen = new Integer(0);
          } else {
                   try {
                    row.m_augmen = new Integer(svalue.trim());
                   } catch (NumberFormatException e) {
                          JOptionPane.showMessageDialog( null,  "Error", "Please enter only integer values.",  JOptionPane.ERROR_MESSAGE);
          break;
      case 11:
     row.m_vendor = svalue; break;}
    fireTableCellUpdated(nRow,nCol);
  public void insert (int nRow)
    if (nRow < 0)
      nRow = 0;
    if (nRow >     m_vector.size ())
      nRow  =
     m_vector. size ();
    m_vector.insertElementAt
      (new
       TrunkData (),
       nRow);
  public boolean delete (int nRow)
    if (nRow < 0
     || nRow >=
     m_vector.size
     ())return
          false;
    m_vector.remove (nRow);
    return true;
  public String getTitle() {
    return "Verizon Trunk Table";
} //class trunk report data
class TrunkComparator implements Comparator {
  protected int            m_sortCol;
  protected boolean m_sortAsc;
  public TrunkComparator(int sortCol, boolean sortAsc) {
    m_sortCol = sortCol;
    m_sortAsc = sortAsc;
  public int compare(Object o1, Object o2)
    if (!(o1 instanceof TrunkData) || !(o2 instanceof TrunkData))
      return 0;
    TrunkData s1=(TrunkData)o1;
    TrunkData s2=(TrunkData)o2;
    int result=0;
    String str1="", str2="";
    int i1=0, i2=0;
    switch(m_sortCol) {
    case 0: //sysname
      str1=(String)s1.m_sysname;
      str2=(String)s2.m_sysname;
      result=str1.compareTo(str2);
      break;
    case 1: // clli
      str1=(String)s1.m_clli;
      str2=(String)s2.m_clli;
      result=str1.compareTo(str2);
      break;
    case 2: //TG
      str1=(String)s1.m_tg;
      str2=(String)s2.m_tg;
      result=str1.compareTo(str2);
      break;
    case 3: //member
      i1 =s1.m_member.intValue();
      i2 =s2.m_member.intValue();
      result = i1 < i2 ? -1 : (i1 > i2 ? 1 : 0);
      break;
    case 4: //trunk type
      str1=(String)s1.m_trunk_type;
      str2=(String)s2.m_trunk_type;
      result=str1.compareTo(str2);
      break;
    case 5: //lata
      str1=(String)s1.m_lata;
      str2=(String)s2.m_lata;
      result=str1.compareTo(str2);
      break;
    case 6: //lata name
      str1=(String)s1.m_lata_name;
      str2=(String)s2.m_lata_name;
      result=str1.compareTo(str2);
      break;
    case 7: //prospect server
      str1=(String)s1.m_prospect_server;
      str2=(String)s2.m_prospect_server;
      result=str1.compareTo(str2);
      break;
    case 8: //tgroup id
      str1=(String)s1.m_tgroupid;
      str2=(String)s2.m_tgroupid;
      result=str1.compareTo(str2);
      break;
    case 9: //ctg
      str1=(String)s1.m_ctg;
      str2=(String)s2.m_ctg;
      result=str1.compareTo(str2);
      break;
    case 10: //augments
      i1 =s1.m_augmen.intValue();
      i2 =s2.m_augmen.intValue();
      result = i1 < i2 ? -1 : (i1 > i2 ? 1 : 0);
      break;
    case 11: //vendor
      str1=(String)s1.m_vendor;
      str2=(String)s2.m_vendor;
      result=str1.compareTo(str2);
      break;
    if (!m_sortAsc) result = -result;
    return result;
  public boolean equals(Object obj) {
    if (obj instanceof TrunkComparator) {
      TrunkComparator compObj=(TrunkComparator) obj;
      return (compObj.m_sortCol == m_sortCol) &&
     (compObj.m_sortAsc==m_sortAsc);
    return false;
} //class trunk comparator

Answer 1

Problem resolved by modifying the code to this:
bt.setToolTipText("Delete Row");   
bt.setRequestFocusEnabled(false);   
lst = new ActionListener ()      {     
public void       actionPerformed       (ActionEvent e)       {       
int nRow = m_table.getSelectedRow();          
if (nRow  < 0)           
JOptionPane.showMessageDialog( null,  "Please select a row to delete",  "Error", JOptionPane.ERROR_MESSAGE);          
else if (JOptionPane.showConfirmDialog(null, "Do you want to delete the selected row?", "Delete a Row", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION)
m_table.getCellEditor().stopCellEditing();   
if (m_data.delete (nRow))           {          
     m_table.tableChanged            (new TableModelEvent             (m_data, nRow, nRow,              TableModelEvent.ALL_COLUMNS,              TableModelEvent.DELETE));          //m_table.clearSelection();       
   };