@Controller
public class GuestController {

    @Autowired
    CRUDDAO cruddDAO;

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(GuestType.class, "guestType", new GuestTypeEditor(cruddDAO));
    }

    ................................

    @RequestMapping(value = "guest_list/add/save", method = RequestMethod.POST)
    public String addGuestSave(@ModelAttribute("guestList") GuestListWrapper guests, BindingResult result, SessionStatus status) {

        if (guests != null) {
            for (Guest guest : guests.getGuests()) {
                cruddDAO.saveOrUpdate(guest);
            }
        }
        return "redirect:/guest_list";
    }
}

public class GuestListWrapper {
    
    private List<Guest> guests = LazyList.decorate(new ArrayList(),
      FactoryUtils.instantiateFactory(Guest.class));

    public List<Guest> getGuests() {
        return guests;
    }

    public void setGuests(List<Guest> guests) {
        this.guests = guests;
    }
}

public class GuestTypeEditor extends PropertyEditorSupport {

    private CRUDDAO guestService;

    public GuestTypeEditor() {
    }

    
    public GuestTypeEditor(CRUDDAO guestService) {
        this.guestService = guestService;
    }

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        GuestType type = (GuestType) guestService.get(GuestType.class, Integer.parseInt(text));
        this.setValue(type);
    }

    @Override
    public String getAsText() {
        GuestType guest = (GuestType) this.getValue();
        String temp = "";
        if (guest != null) {
            temp = guest.getId() != null ? guest.getId().toString() : "";
        }
        return temp;
    }
}

@InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(GuestType.class, "guestType", new GuestTypeEditor(cruddDAO));
    }

@InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(GuestType.class, new GuestTypeEditor(cruddDAO));
    }