JTable in JInternalFrame

Question

Hi,
I am having a problem with editing cells in a JTable. I have initially created a table using a custom table model in a JFrame. Everything works as expected.
Now that I have modified it so that the JFrame becomes a JInternalFrame inside my Desktop I have lost the ability to edit cells.
I can still select individual cells, however no caret displays and no input from the keyboard is accepted.
I don't understand why the ability to edit cells is lost whenever the table is in a JInternalFrame.
Could someone explain or suggest why this would be happening.
Thanks.

Answer 1

Hi,
Thanks for the quick reply.
I tried them both but it didn't work and Yes everything is set to use a JDesktopPane.
below is some of the code if that helps
//This is the AbstractTableModel
class MatrixTableModel extends AbstractTableModel
  private double[][] data = { {0.0} };
  public int getColumnCount()
    return data.length;
  public int getRowCount()
   return data.length;
   public Object getValueAt(int row, int col)
    return new Double(data[row][col]);     
   public boolean isCellEditable(int row, int col)
     return true;     
   public void setValueAt(Object value, int row, int col)
    double doubleVal;
    try
     doubleVal = new Double(value.toString()).doubleValue();       
     data[row][col] = Math.floor(doubleVal*1000 + .5) /1000;
     fireTableCellUpdated(row,col);
     fireTableCellUpdated(col,row);
    catch (NumberFormatException e)
      JOptionPane.showMessageDialog(null,"Input matrix can only contain real values");
   public void changeData(double A[][])
    data = A;
    mtm.fireTableStructureChanged();
//The TableColumnModel I use
TableColumnModel cm = new DefaultTableColumnModel()
public void addColumn(TableColumn tc)
  tc.setMinWidth(50);
  tc.setMaxWidth(100);    
  seqEditor = new JTextField();     
  seqEditor.setMargin(new Insets(0,0,0,0));
  seqEditor.setHorizontalAlignment(SwingConstants.CENTER);
  seqCellEditor = new DefaultCellEditor(seqEditor);
  seqCellEditor.setClickCountToStart(1);
  tc.setCellEditor(seqCellEditor);
  super.addColumn(tc);
//each are added as follows
    Matrix = new JTable(mtm);
    Matrix.setColumnModel(cm); The cells look as if they are selected - i.e. the rectangle outline is black when selected.
I placed a message in the setValueAt method and i know that it is called whenever i select away from a selectd cell.
Any ideas,
Thanks