为什么在Eclipse中编辑时导入的spring项目无法运行？

Question

我是Spring和Java的新手。当我在eclipse ide中导入我的朋友Web项目时，它可以正常运行。但是，当我尝试创建新页面时，它说找不到（404错误）。我也编辑了控制器，但似乎无济于事。请帮忙。

我的控制器..

@Controller
public class laganController {

    // For controlling pages
    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String Index(HttpServletRequest request, Model model, HttpServletResponse response){
        return "index";
    }
    @RequestMapping(value = "/signup", method = RequestMethod.GET)
    public String Signup(HttpServletRequest request, Model model, HttpServletResponse response){
        return "signup";
    }

当我添加以下方法时，它不会重定向到该主页...但是上述代码可以正常运行。请帮助

@RequestMapping(value = "/home", method = RequestMethod.GET)
    public String home(HttpServletRequest request, Model model, HttpServletResponse response){
        return "home";
    }