JTable copiar y pegar usando el Portapapeles y AbstractAction

Cuando trato de pegar en unJTable celular usandotable.setValueAt(), la celda en la que estoy pegando permanece en blanco, perosetValueAt() Parece estar funcionando. Además, cuando trato decortar oCopiar desde una celda, la opción Pegar en miJPopupMenu permanece deshabilitado cuando quiero pegar en otra celda. No estoy seguro de por qué. Mi codigo esta abajo.

class CopyAction extends AbstractAction {

    private JTable table;

    public CopyAction(JTable table) 
    {
        this.table = table;
    }

    @Override
    public void actionPerformed(ActionEvent e) 
    {
        int row = table.getSelectedRow();
        int col = table.getSelectedColumn();

        Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
        cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);

    }

}

class CutAction extends AbstractAction {

    private JTable table;

    public CutAction(JTable table) 
    {
        this.table = table;      
    }

    @Override
    public void actionPerformed(ActionEvent e) 
    {
        int row = table.getSelectedRow();
        int col = table.getSelectedColumn();

        Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
        cb.setContents(new CellTransferable(table.getValueAt(row, col)), null);



    }

}

class PasteAction extends AbstractAction {

    private JTable table;
    private GridModel gridModel;

    public PasteAction(JTable tbl, GridModel gm) 
    {
        gridModel = gm;

        table = tbl;

        final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();

        cb.addFlavorListener(new FlavorListener() {
            @Override
            public void flavorsChanged(FlavorEvent e) 
            { 
                setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
            }
        });
        setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR));
    }

    @Override
    public void actionPerformed(ActionEvent e) 
    {
        int row = table.getSelectedRow();
        int col = table.getSelectedColumn();

        Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
        if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)) 
        {
            try 
            {
                Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR);
                System.out.println(value);
                table.setValueAt(value, row, col);


            } 
            catch (UnsupportedFlavorException | IOException ex) 
            {
                ex.printStackTrace();
            }
        }
    }

}

class CellTransferable implements Transferable {

    public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value");

    private Object cellValue;

    public CellTransferable(Object cellValue) {
        this.cellValue = cellValue;
    }

    @Override
    public DataFlavor[] getTransferDataFlavors() {
        return new DataFlavor[]{CELL_DATA_FLAVOR};
    }

    @Override
    public boolean isDataFlavorSupported(DataFlavor flavor) {
        return CELL_DATA_FLAVOR.equals(flavor);
    }

    @Override
    public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
        if (!isDataFlavorSupported(flavor)) {
            throw new UnsupportedFlavorException(flavor);
        }
        return cellValue;
    }


}

Aquí está mi código parasetValueAt()

class MyModel extends AbstractTableModel  
{
    private String[] names = {"1", "2", "3", "4", "5" };    
    private String[][] values = new String[5][5];

    //...other methods

    public void setValueAt(Object value, int row, int col) 
    {
        if (value instanceof Double || value instanceof Integer)
            values[row][col] = value.toString();
        else
        {
            values[row][col] = (String) value;
        }

        fireTableCellUpdated(row, col);
    }

}