WebView and Twitter4j

Question

Hi All,
I have a very strange one. Using a WebView by itself is fine. Using a twitter4j instance by itself is also fine. But for some reason, when I use both, it bombs out with a null pointer and seems to be blaming a cookie!?
The main issue arises when I get to the requestToken. You'll need twitter4j to test this:
package webtest;
import java.io.IOException;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.RequestToken;
public class WebTest extends Application {
     * @param args the command line arguments
    public static void main(String[] args) {
        Application.launch(WebTest.class, args);
    @Override
    public void start(Stage primaryStage) throws TwitterException, IOException {
        primaryStage.setTitle("Hello World");
        Group root = new Group();
        Scene scene = new Scene(root, 800, 600, Color.LIGHTGREEN);
        primaryStage.setScene(scene);
        primaryStage.setVisible(true);
        WebView browser = new WebView();
        browser.setPrefSize(600, 400);
        WebEngine webEngine = new WebEngine();
        webEngine.load("http://www.google.com");
        browser.setEngine(webEngine);
        root.getChildren().add(browser);
        Twitter twitter = new TwitterFactory().getInstance();
        twitter.setOAuthConsumer("Nothing", "Test");
        RequestToken requestToken = twitter.getOAuthRequestToken();
}Note: Using a valid "twitter.setOAuthConsumer("Nothing", "Test");" does the excat same thing, so it's not that I'm using an incorrect consumer key.
Now, am I crazy, or is this really bombing out due to the combination of both? Commenting out the requestToken goes fine and commenting out the WebView stuff also goes fine....

Answer 1

Hi Narayan,
thanks for the reply. I am aware of how to do it, but running that code throws me a null pointer. Did you try that code yourself? perhaps it is just me for some reason.... Please let me know if it works for you :)
package webtest;
import java.io.IOException;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import twitter4j.TwitterFactory;
import twitter4j.auth.AccessToken;
import twitter4j.auth.RequestToken;
public class WebTest extends Application {
     * @param args the command line arguments
    public static void main(String[] args) {
        Application.launch(WebTest.class, args);
    @Override
    public void start(Stage primaryStage) throws TwitterException, IOException {
        primaryStage.setTitle("Hello World");
        Group root = new Group();
        Scene scene = new Scene(root, 800, 600, Color.LIGHTGREEN);
        primaryStage.setScene(scene);
        primaryStage.setVisible(true);
        WebView browser = new WebView();
        browser.setPrefSize(600, 400);
        WebEngine webEngine = new WebEngine();
        browser.setEngine(webEngine);
        Twitter twitter = new TwitterFactory().getInstance();
        twitter.setOAuthConsumer("{myKey}", "{mySecret}");
// Set break point here if you wish :)
        RequestToken requestToken = twitter.getOAuthRequestToken();
        if(requestToken.getAuthorizationURL()!=null){
            webEngine.load(requestToken.getAuthorizationURL());
        root.getChildren().add(browser);
        //AccessToken accessToken = twitter.getOAuthAccessToken(requestToken,"1234567");
}And null pointer:
run:
Exception in Application start method
java.lang.RuntimeException: java.lang.NullPointerException
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1137)
     at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2346)
     at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:388)
     at twitter4j.internal.http.HttpResponseImpl.<init>(HttpResponseImpl.java:35)
     at twitter4j.internal.http.HttpClientImpl.request(HttpClientImpl.java:168)
     at twitter4j.internal.http.HttpClientWrapper.request(HttpClientWrapper.java:65)
     at twitter4j.internal.http.HttpClientWrapper.post(HttpClientWrapper.java:102)
     at twitter4j.auth.OAuthAuthorization.getOAuthRequestToken(OAuthAuthorization.java:121)
     at twitter4j.auth.OAuthAuthorization.getOAuthRequestToken(OAuthAuthorization.java:104)
     at twitter4j.TwitterBaseImpl.getOAuthRequestToken(TwitterBaseImpl.java:271)
     at twitter4j.TwitterBaseImpl.getOAuthRequestToken(TwitterBaseImpl.java:264)
     at webtest.WebTest.start(WebTest.java:48)
     at com.sun.javafx.application.LauncherImpl$3.run(LauncherImpl.java:112)
     at com.sun.javafx.application.PlatformImpl$3.run(PlatformImpl.java:87)
     at com.sun.javafx.application.PlatformImpl$2.run(PlatformImpl.java:65)
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
     at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
     at com.sun.glass.ui.win.WinApplication$2.run(WinApplication.java:51)
     at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NullPointerException
     at com.sun.webpane.webkit.network.CookieJar$PolicyDelegateFilter.shouldAccept(CookieJar.java:41)
     at com.sun.webpane.webkit.network.CookieManager.put(CookieManager.java:193)
     at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:710)
     at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1195)
     at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:379)
     ... 16 more
BUILD SUCCESSFUL (total time: 2 seconds)Edited by: user6459266 on 06-Jul-2011 01:00