#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
#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;
    }