class DemoService {

    public Collection<RoutingProblem> demos() {
        return routingProblems.all();
    }

    @Autowired public  DemoService(
            RoutingProblemList routingProblems,
            LocationService locationService,
            LocationRepository locationRepository,
            VehicleService vehicleService,
            VehicleRepository vehicleRepository,
            DataSetMarshaller dataSetMarshaller);

}