How to make logout

    public String onLogout() {
     FacesContext fctx = FacesContext.getCurrentInstance();
     ExternalContext ectx = fctx.getExternalContext();
     String url = ectx.getRequestContextPath() +
                "/adfAuthentication?logout=true&end_url=/faces/loginpage.jspx";    
     try {
       ectx.redirect(url);
     } catch (IOException e) {
       e.printStackTrace();
     }
     fctx.responseComplete();
     return null;
    }
    public void logout(ActionEvent actionEvent) {
            // Add event code here...
            ExternalContext ectx = FacesContext.getCurrentInstance().getExternalContext();
            HttpServletResponse response = (HttpServletResponse)ectx.getResponse();
            String url = ectx.getRequestContextPath()+"/faces/loginpage.jspx";
            HttpSession session = (HttpSession)ectx.getSession(false);
            session.invalidate();
            try {
                response.sendRedirect(url);
                FacesContext.getCurrentInstance().responseComplete();
            } catch (IOException e) {
                System.out.println(e.getMessage());
            }
            return;
        }

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