@RequestMapping(value = "/addTravelTrip", method = RequestMethod.POST)
    public String registerNewTravelTrip(
            @Valid @ModelAttribute("newTravelTrip") TravelTrip newTravelTrip,
            BindingResult result, Model model) {               
         
        if (!result.hasErrors()) {         
            travelTripService.addTravelTrip(newTravelTrip);
            model.addAttribute("travelTripList", travelTripService.findAll());
            return "redirect:/";
        } else {
            return "addTravelTrip";
 
        }      
    }