Why Does Authorization Redirect Fail on JSF Form Submission After Session Expiration and How to Fix It?

Authorization redirect on session expiration fails on JSF form submission

Your JSF application redirects to the login page on session expiration only when a page navigation occurs. However, when a JSF form is submitted, the issue is not resolved. This problem can stem from an incorrect handling of AJAX requests in your custom servlet.

To resolve this, consider utilizing a servlet filter for authorization checks instead of creating a custom servlet. Servlet filters are better suited for this task.

Here is a sample implementation of an authorization filter:

<code class="java">@WebFilter("/*")
public class AuthorizationFilter implements Filter {

    // Prepare XML response to redirect on AJAX requests
    private static final String AJAX_REDIRECT_XML = ...

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request = ...;
        HttpServletResponse response = ...;
        HttpSession session = ...;
        String loginURL = ...;

        boolean loggedIn = ...;
        boolean loginRequest = ...;
        boolean resourceRequest = ...;
        boolean ajaxRequest = ...;

        // Allow access for logged-in users, login requests, resource requests, and AJAX requests
        if (loggedIn || loginRequest || resourceRequest) {
            chain.doFilter(request, response);
        }
        // For AJAX requests, return an XML response instructing the JSF engine to redirect
        else if (ajaxRequest) {
            ...
        }
        // For non-AJAX requests, perform a standard redirect
        else {
            response.sendRedirect(loginURL);
        }
    }
}</code>

This filter checks the user's login status and the type of request. If the user is not logged in or the request is not an AJAX request, a redirect is performed. For AJAX requests, a special XML response is returned to instruct the JSF engine to send a redirect.

By using a servlet filter with appropriate handling of AJAX requests, you can ensure that authorization redirects on session expiration work correctly for both page navigations and form submissions.

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