Clearing Cache after Logout

[vishy_sb]

Hi all,

I have a logout link that takes me to the login (Home) page. However when I
click the back button it brings me back  to the same page that I was on
(Although I am not able to do anything on this page as whenever I press some
button I get the error "Page Expired") A better option would be to display
the Log in page itself even if the back button is pressed.  I am trying to
clear the cache so that the back button becomes disabled whenever the log
out button is pressed. The code for my logout button is below:

Link logout = new Link("logout"){
                        private static final long serialVersionUID = 1L;

                                @Override
                                public void onClick() {
                                        session.invalidate();                   
                
                                        getRequestCycle().setRedirect(true);
                                        setResponsePage(Index.class);
                                }
                        };

Any ideas how this could be resolved.

Thanks in advance,
vishy
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