@RequestMapping(value = "/add", method = RequestMethod.POST)
  public String addPerson(@ModelAttribute("person") Person person, BindingResult result) {

    personService.addPerson(person);

    return "redirect:/people/";
  }
  @RequestMapping("/delete/{personId}")
  public String deletePerson(@PathVariable("personId") Integer personId) {

    personService.removePerson(personId);

    return "redirect:/people/";
  }
  @RequestMapping("/")
  public String listPeople(Map<String, Object> map) {

    map.put("person", new Person());
    map.put("peopleList", personService.listPeople());

    return "people";
  }