How to redirect to the homepage if the user accesses the login page after being logged in?

Question

Here is my spring security config:

Answer 1

You can keep it simple flow by access-denied-page attribute in http element or as dtrunk said to write handler for access denied as well as. the config would be like

 
 
 
 
 ...

in controller for /403

@RequestMapping(value = "/403", method = RequestMethod.GET)
public String accessDenied() { //simple impl
    return "redirect:/home";
}

and for /home

@RequestMapping(value = "/home", method = RequestMethod.GET)
public String home(Authentication authentication) {
 // map as many home urls with Role
    Map dashBoardUrls = new HashMap();
    dashBoardUrls.put("ROLE_USER", "/user/dashboard");
    dashBoardUrls.put("ROLE_ADMIN", "/admin/dashboard");

    String url = null;

    Collection grants = authentication
            .getAuthorities();
 // for one role per user
    for (GrantedAuthority grantedAuthority : grants) {
        url = dashBoardUrls.get(grantedAuthority.getAuthority());
    }
    if (url == null)
        return "/errors/default_access_denied.jsp";

    return "redirect:" + url;
}

and when you make request for /admin/dashboard without logged in, it will redirect /login automatically by security