I am trying to do login with Twitter and using Twitter4j for that and wrote this code

In JSF

 <h:commandButton id="twitterbutton" value="Sign up with Twitter"
                            action="#{twitterLoginBean.redirectTwitterLogin}" immediate="true" styleClass="twitterbutton"/>

In ManagedBean

    public String redirectTwitterLogin() throws ServletException, IOException,
                TwitterException {
            HttpServletRequest request = (HttpServletRequest) FacesContext
                    .getCurrentInstance().getExternalContext().getRequest();
            HttpServletResponse response = (HttpServletResponse) FacesContext
                    .getCurrentInstance().getExternalContext().getResponse();

Twitter twitter = TwitterFactory.getSingleton();
        twitter.setOAuthConsumer(apiKey, apiSecret);

            RequestToken requestToken = twitter.getOAuthRequestToken();
            if (requestToken != null) {
                AccessToken accessToken = null;
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        System.in));
                while (null == accessToken) {
                    try {
                        String pin = br.readLine();
                        accessToken = twitter
                                .getOAuthAccessToken(requestToken, pin);

                    } catch (TwitterException te) {
                        System.out
                                .println("Failed to get access token, caused by: "
                                        + te.getMessage());
                        System.out.println("Retry input PIN");

                    }
                }

                request.setAttribute(IS_AUTHENTICATED, true);

                if (accessToken != null) {

                    LOGGER.debug("We have a valid oauth token! Make the facebook request");

                    doApiCall(twitter, request, response);
                    return null;

                }
            } else {

                LOGGER.debug("We don't have auth code yet, fetching the Authorization URL...");
                String authorizationUrl = requestToken.getAuthorizationURL();
                LOGGER.debug("Redirecting to the Authorization URL: {}",
                        authorizationUrl);

                request.setAttribute(IS_AUTHENTICATED, false);
                redirect(authorizationUrl, response);
                return null;

            }
            return null;

        }

In above code i want first Login window of twitter will show and then again same method will call and after user will login i can show user information userId,Handel,location etc.

Redirect

private void redirect(String url, HttpServletResponse response)
            throws IOException {

        String urlWithSessionID = response.encodeRedirectURL(url);
        response.sendRedirect(urlWithSessionID);

    }

But this code is not working Can anyone tell better Solution for this ?