How to check multiple checkboxes in a JTable?

Question

So I have this table:

table = new JTable();

Which models my model: table.setModel(model);

Inside I have a column called CheckColumn which has only CheckBoxes.

The thing is that if I check one box, it checks it and if I want to check another one, it removes the previous check. So it lets me check only one checkbox.

For the checkboxes I'm using the following:

table.getColumnModel().getColumn(15).setCellEditor(new CheckBoxCellEditor());
table.getColumnModel().getColumn(15).setCellRenderer(new CWCheckBoxRenderer());

From the Classes:

class CheckBoxCellEditor extends AbstractCellEditor implements TableCellEditor {

    private static final long serialVersionUID = 1L;
    protected JCheckBox checkBox;

    public CheckBoxCellEditor() {
        checkBox = new JCheckBox();
        checkBox.setHorizontalAlignment(SwingConstants.CENTER);
        checkBox.setBackground(Color.white);
    }

    public Component getTableCellEditorComponent(
            JTable table,
            Object value,
            boolean isSelected,
            int row,
            int column) {

        checkBox.setSelected(((Boolean) value).booleanValue());

        Component c = table.getDefaultRenderer(String.class).getTableCellRendererComponent(table, value, isSelected, false, row, column);
        if (c != null) {
            checkBox.setBackground(c.getBackground());
        }

        return checkBox;
    }
    public Object getCellEditorValue() {
        return Boolean.valueOf(checkBox.isSelected());
    }
}

And:

class CWCheckBoxRenderer extends JCheckBox implements TableCellRenderer {

    public CWCheckBoxRenderer() {
        super();
        setOpaque(true);
        setHorizontalAlignment(SwingConstants.CENTER);
    }

    public Component getTableCellRendererComponent(
            JTable table,
            Object value,
            boolean isSelected,
            boolean hasFocus,
            int row,
            int column) {

        if (value instanceof Boolean) {

            setSelected(((Boolean)value).booleanValue());
            setEnabled(table.isCellEditable(row, column));

            if (isSelected) {
                setBackground(table.getSelectionBackground());
                setForeground(table.getSelectionForeground());
            } else {

                setForeground(table.getForeground());
                setBackground(table.getBackground());
            }
        }
        else {
            setSelected(true);
            setEnabled(true);
            return null;
        }

        return this;
    }

}

I want to be able to check more than one row. Can someone tell me how can I do that? Is there something to be modified in the code or I need a new approach?

This is a summary of how the model looks like:

    private static final int CheckCol = 15;
    private List<Clients> clients;

    public boolean isCellEditable(int row, int col){
             if(col == 15){
                 return true;

             }
             return false;
         }


    public void setValueAt(Object value, int row, int col) {
            //if(col==15) (not sure what to do in here)

            //fireTableCellUpdated(row, col);
        }

    public Object getValueAt(int row, int col) {
            Clients tempClient = clients.get(row);

            switch (col) {

            case CheckCol:
                return false;  //my CheckColumn type is Boolean


            default:
                return false;

            }
}

I've tried everything I could think of to change the model...Can someone tell me how should the model look like? I need to get data from a mysql server and I don't know how to model the checkbox column.

Thanks in advance!