How to: FacesMessage in timed out HttpSession

Question

Hi,
I implemented a javax.servlet.Filter, which does the following in the doFilter():
=> if the HttpSession has expired redirect to the login page and display a corresponding message
if (session == null || currentUser == null || !currentUser.isLoggedIn()) {
FacesContext ctx = FacesContext.getCurrentInstance();
ctx.addMessage(null, new FacesMessage("Session timed out"));
response.sendRedirect(request.getContextPath());
return;
The redirection works as expected, only the message is not displayed. The view
is prepared properly and displays other messages only here is does not work.
What do I have to change to get the message displayed?
Thnx!

Answer 1

FacesMessages are request scoped.
A redirect lets the client create a new request.