How to avoid redirect loop in spring web mvc - spring

Question

public class ValidateSession extends HandlerInterceptorAdapter {
//before the actual handler will be executed
public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {
HttpSession session = request.getSession();
if(session.getAttribute("user")==null){
/*ModelAndView mav = new ModelAndView("/login/index");
throw new ModelAndViewDefiningException(mav);*/
ModelAndView mav = new ModelAndView();
mav.setViewName("redirect:/login/index.mars");
throw new ModelAndViewDefiningException(mav);
}
return true;
}
}
In my case if session is expired then user can't access my application, but i am stuck with redirection loop. although i have tried many possible ways but not luck :(

Answer 1

Don't associate the ValidateSession handler with the login/index.mars request. Use mvc interceptor. Exclusions possible since 3.2, I think.
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/yourpath/*"/>
<exclude-mapping path="/login/index.mars"/>
<bean class="org...ValidateSession " />
</mvc:interceptor>
</mvc:interceptors>

Answer 2

I know this is an old post but thought it may be of help since none of the above worked for me.
In the class implementing HandlerInterceptor:
response.sendRedirect("login?logout=true");
then in controller:
#RequestMapping(value = "login", method = RequestMethod.GET)
public String login(ModelMap modelmap, HttpServletRequest request, HttpSession httpSession, #RequestParam(required = false) String logout, #RequestParam(required = false) String reason, #RequestParam(required = false) String message) {
if (reason != null && MvcStatics.ERROR_MAP.get(reason) != null) {
ArrayList<String> errors = new ArrayList<>();
errors.add(MvcStatics.ERROR_MAP.get(reason));
modelmap.addAttribute("errors", errors);
}
if (logout != null && logout.equalsIgnoreCase("true")) {
httpSession.removeAttribute("loggedIn");
httpSession.removeAttribute("user");
httpSession.removeAttribute("token");
modelmap.addAttribute("message", "You have successfully been logged out.");
}}

Answer 3

i experienced the same issue. just remove the "redirect:" appended before "/login/index.mars"
ModelAndView mav = new ModelAndView();
mav.setViewName("redirect:/login/index.mars");
//to this and you redirect ll works fine
mav.setViewName("/login/index.mars");
throw new ModelAndViewDefiningException(mav);