#vulnerable code 
                                @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public RouteDTO detailRoute(@PathVariable String id, @PathVariable String env) {
        Route route = routeService.findRoute(id);
        if (route == null) {
            // TODO throw exception
        }
        RouteDTO routeDTO = convertRoutetoRouteDTO(route, id);
        return routeDTO;
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @RequestMapping(value = "/{id}", method = RequestMethod.GET)
    public RouteDTO detailRoute(@PathVariable String id, @PathVariable String env) {
        Route route = routeService.findRoute(id);
        if (route == null) {
            throw new ResourceNotFoundException("Unknown ID!");
        }
        RouteDTO routeDTO = convertRoutetoRouteDTO(route, id);
        return routeDTO;
    }