Spring Security + AJAX Session Timeout issue

Hello,
I have a Spring MVC application which loads data dynamically through AJAX.
 All AJAX entry points are protected and the user must be authenticated in
order to access the AJAX endpoints.

I need for my front end code to know when a session timeout occurs when an
AJAX request is made.  I have implemented this using
LoginAuthenticationEntryPoint implementation and if the HTTP request
contains the "X-Requested-With header" with a value of "XMLHttpRequest", I
send back a 403 Error Code.

This works for the most part, the issue is that on the very first AJAX
Request, spring performs a redirect and I get a 302 followed by a redirect
to my login page, on all subsequent AJAX requests the correct 403 comes
back.

Below is the relevant Spring security config and the
AjaxAwareAuthenticationEntryPoint source.

Side Note: I have also tried this using the request matcher implementation
outlined here:
http://distigme.wordpress.com/2012/11/01/ajax-and-spring-security-form-based-login/
 and I get the same exact results.

Any ideas?

Thanks!
Alessandro Ferrucci

<beans:bean id="authenticationEntryPoint"
 class="mojo.ocs.web.AjaxAwareAuthenticationEntryPoint">
        <beans:constructor-arg name="loginUrl" value="/login"/>
    </beans:bean>
    <!-- ENTRY POINT REF IMPLEMENTATION -->
    <http auto-config="true" use-expressions="true"
access-denied-page="/accessdenied"
entry-point-ref="authenticationEntryPoint">
        <intercept-url pattern="/login" access="isAnonymous()"/>
        <intercept-url pattern="/loginfailed" access="isAnonymous()"/>
        <intercept-url pattern="/welcome" access="isAuthenticated()" />
        <intercept-url pattern="/" access="isAuthenticated()" />
        <intercept-url pattern="/private_res/**" access="isAuthenticated()"
/>
        <intercept-url pattern="/tne/**" access="isAuthenticated()" />
        <intercept-url pattern="/team_reports/**"
access="isAuthenticated()" />
        <form-login login-page="/login" default-target-url="/welcome"
always-use-default-target="true" authentication-failure-url="/loginfailed"
/>
        <logout delete-cookies="JSESSIONID"  logout-success-url="/logout"
invalidate-session="true"/>
        <session-management invalid-session-url="/login" />
    </http>

This is the AjaxAwareAuthenticationEntryPoint:

public class AjaxAwareAuthenticationEntryPoint extends
LoginUrlAuthenticationEntryPoint {

    public AjaxAwareAuthenticationEntryPoint(String loginUrl) {
        super(loginUrl);
    }

    @Override
    public void commence(
            HttpServletRequest request,
            HttpServletResponse response,
            AuthenticationException authException)
            throws IOException, ServletException {
        String ajaxHeader = ((HttpServletRequest)
request).getHeader("X-Requested-With");
        boolean isAjax = "XMLHttpRequest".equals(ajaxHeader);
        if (isAjax) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN, "Ajax
REquest Denied (Session Expired)");
        } else {
            super.commence(request, response, authException);
        }
    }
}

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