i am trying to gain user's ip address via listenner but ı couldnt success

public void attributeAdded(HttpSessionBindingEvent arg0) {
        try {
            
            FileWriter file = new FileWriter("C:/authentication_log.txt");
            session = arg0.getSession();
            String ip = (String) session.getAttribute("ip");
            file.write(ip +": "+new Date()+"\n");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
            }


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