如何修复我的控制器在 spring mvc 中不起作用？

Question

I'm new to Spring MVC. I want to get the logged in user's info by using session but why does my code return nothing in the view? There's no error, the other views are fine. So maybe my controller is not working. Can somebody tell me what's wrong about the code? Here is the controller

@RequestMapping(value = "manager/main/{userId}", params = "edit", method = RequestMethod.GET)
    public String getLoginUser (HttpSession ss, ModelMap model) {   
        
        if (ss.getAttribute("user") != null) {
            User tk = (User) ss.getAttribute("user");
            model.addAttribute("userInfo", tk);
            model.addAttribute("isOpenModalEditUser", true);
        }
        return "manage/manager/main";
    }

Here is my jsp

<a href="manager/main/${userInfo.getUserId()}?edit" class="dropdown-item" data-toggle="modal"
data-target="#modal-lg">${userInfo.getEmployee().getFName()} ${userInfo.getEmployee().getLName()}</a>

Answer 1

Your Java code is right, but first you need to make sure that there is 'user' in the session, probably when logging in, the session is not being saved. when logging in, you need to set the 'user', like:

ss.setAttribute("user", user);

after certifying that the backend is correct, then go to the frontend corrections, if necessary.

but according to my tests, the backend is ok, just need to make sure that the 'user' is being saved in the session.