output: #fixed code
                                  @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
      public boolean updateRule(@PathVariable String id, @RequestBody RouteDTO routeDTO, @PathVariable String env) {
          Route route = routeService.findRoute(id);
          if (route == null) {
              throw new ResourceNotFoundException("Unknown ID!");
          }
          routeDTO.setVersion(route.getVersion());
          routeDTO.setService(route.getService());
          Route newRoute = convertRouteDTOtoRoute(routeDTO, id);
          routeService.updateRoute(newRoute);
          return true;
      }
input: #vulnerable code 
                                  @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
      public boolean updateRule(@PathVariable String id, @RequestBody RouteDTO routeDTO, @PathVariable String env) {
          Route route = routeService.findRoute(id);
          if (route == null) {
              //TODO Exception
          }
          routeDTO.setVersion(route.getVersion());
          routeDTO.setService(route.getService());
          Route newRoute = convertRouteDTOtoRoute(routeDTO, id);
          routeService.updateRoute(newRoute);
          return true;
      } 
                              #location 7 
                              #vulnerability type NULL_DEREFERENCE