/** Invoked when an action occurs. */
 public void actionPerformed(final ActionEvent e) {
   final TableCellEditor tableCellEditor = parameterMappingTable.getCellEditor();
   if (tableCellEditor != null) {
     tableCellEditor.stopCellEditing();
   }
   final ParameterMappingTableModel tableModel =
       (ParameterMappingTableModel) parameterMappingTable.getModel();
   tableModel.addRow();
 }