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a question about Spring controller
@Controller
public class HomeController {
  public static final int DEFAULT_SPITTLES_PER_PAGE = 25;
  private SpitterService spitterService;
  @Inject
  public HomeController(SpitterService spitterService) {
    this.spitterService = spitterService;
  }
  @RequestMapping({"/","/home"})
  public String showHomePage(Map<String, Object> model) {

    model.put("spittles",
              spitterService.getRecentSpittles(DEFAULT_SPITTLES_PER_PAGE));
    return "home";
  }
}