spring security session ajax,Spring security + Ajax session timeout issue

I have an app build with Spring MVC and secured with Spring security, a bunch of the controllers are JSON rest services that are all protected. I'm using LoginUrlAuthenticationEntryPoint to detect AJAX requests and send 403 ERROR CODE if session timeout occurs - all other requests just get redirected back to login page.

Below is the Spring Security XML snippet and the authenticationEntryPoint java class.

The issue is that the first AJAX Request after session timeout, Spring redirects to login page and the returns login page HTML, if I attempt to do AJAX request again (after redirect happens) the authenticationEntryPoint executes and HTTP Error Code 403 is returned. I have attempted the same thing using this mechanism http://distigme.wordpress.com/2012/11/01/ajax-and-spring-security-form-based-login/ and the same exact thing happens (on first AJAX request a redirect occurs, all subsequent AJAX requests HTTP 403 is returned). I do not want to get Redirect to login page for AJAX requests where session is timed out.

Any ideas?

Here is the LoginAuthenticationEntryPoint:

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);

}

}

}