addPossiblyNullObject(((UpdateCommand) cmdObj).getObject(), extraClassInstanceList); } else if( cmdObj instanceof AddTaskCommand ) { addPossiblyNullObject(((AddTaskCommand) cmdObj).getParameter(), extraClassInstanceList); } else if( cmdObj instanceof CompleteTaskCommand ) { addPossiblyNullObject(((CompleteTaskCommand) cmdObj).getData(), extraClassInstanceList);