JTable CellEditor not being called second edit

[pointertowhat]

I've got a small test program set up to try and resolve this problem but I'm at a loss now. I have a jTable that has two columns - each of type double.

The table uses a cell editor that selects all the contents on edit. (it also disables the editing on a mouse click to prevent masking of the problem)

public class DblCellEditor extends AbstractCellEditor implements TableCellEditor {
    JComponent component = new JTextField();
    // This method is called when editing is completed.
    // It must return the new value to be stored in the cell.
    public Object getCellEditorValue() {
        return ((JTextField)component).getText();
    }

    // This method is called when a cell value is edited by the user.
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        // Configure the component with the specified value
        ((JTextField)component).setText(String.valueOf(value));
        ((JTextField)component).selectAll();
        // Return the configured component
        System.out.println("I've been Called!!");
        return component;
    }

    @Override
    public boolean isCellEditable(EventObject evt) {
        if (evt instanceof MouseEvent) {
            return false;
        } else {
            return true;
        }
    }

}

The cells are initialised with 0, which when editing starts shows as 0.0

The first time you edit a selected cell (say by simply typing a number) the number you have typed overwrite the current cell value, so say we highlighted the cell and type 5 then <enter> the cell now has a value of 5. All good so far. Now if we go back and edit the cell again by reselecting it and typing 9 the new cell value is 5.09. The CellEditor's getTableCellEditorComponent was NOT called the second time we edit the cell. I've added a println statement to prove this.

As I was typing that I had a relevation. The cell editor returns the value as a string so next time we edit the cell the default editor is called.

So my question is now a tip - remember to return the correct type...

public Object getCellEditorValue() {
        String foo = ((JTextField)component).getText();
// you will need to check this doesn't throw an 
// exception if foo isn't a valid double.
        double i_spent_hours_on_this = Double.valueOf(foo);
        return new Double(i_spent_hours_on_this);
    }