servlet request + javax Filters: how do I redirect users to another page?

Question

might be best explain with an example:

I have a servlet that returns true or false if HTTP post is successful.
I also have a javax filter that checks if a user still has a session. if no session, redirect the user to the login page.
User has 2 browser tabs open and both of them are displaying a form (could be the same or different forms).
in tab1, user logs out.
in tab2, user decides to submit the form (which is calling an servlet).
In my filter and when processing the request for tab2, I w ant to redirect the user to the login page since they already logged out in tab1.

How can I do this? I have tried response.sendRedirect and request.getRequestDispatcher. Both of them does not redirect the user to another page.

Thanks

Karishma_begumSh · Accepted Answer

sendRedirect doesn’t work for AJAX/form posts because the browser won’t auto-navigate.

In your filter, detect missing session and send a 401/440 response.If no session

In your frontend JS, catch that status and explicitly

window.location.href="/login";

That way, when tab2 submits after logout in tab1, the user is redirected to the login page.

Hope this helpful 🙂

Regards,

Karishma.

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