Logout From ADF application

I implemented this method in the Action of the logout button

public String logout{
        FacesContext fctx = FacesContext.getCurrentInstance();
        ExternalContext ectx = fctx.getExternalContext();
        HttpSession session = (HttpSession) ectx.getSession(false);
        session.invalidate();
        HttpServletRequest request = (HttpServletRequest)ectx.getRequest();
        HttpServletResponse response = (HttpServletResponse) ectx.getResponse();
        ServletAuthentication.logout(request,response,false);
        try{
               ectx.redirect("http://iaigc.net");
             }
             catch(Exception e){
               e.printStackTrace();
             }
             fctx.responseComplete();
        return null;
}

Then I changed the property of the ADF taskflow Taskflow Reentry to reentery-not-allowed to prevent the The browser back  button to return to my page

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