/**
  * Execute the "userTripRegistered" operation synchronously
  *
  * @return The result of this operation
  */
 public synchronized boolean userTripRegistered(UserTypPrx usr, TripTypPrx trip) {
   _queryController.destroy();
   DBProcedureController queryController;
   _queryController =
       queryController = new DBProcedureController(_handler, _session.getCardroidManager());
   return queryController.userTripRegistered(usr, trip);
 }