Hello everyone.
I have an Android application an I want to implement a Facebook login with the spring-android module. For that, I used the spring-android-facebook-client from the samples, which is running perfect. But when I run my application, I get the following error:

Code:
FATAL EXCEPTION: WebViewCoreThread
java.lang.NullPointerException
at android.webkit.WebViewDatabase.getInstance(WebViewDatabase.java:184)at android.webkit.CacheManager.init(CacheManager.java:178)
at android.webkit.BrowserFrame.<init>(BrowserFrame.java:202)
at android.webkit.WebViewCore.initialize(WebViewCore.java:186)
at android.webkit.WebViewCore.access$500(WebViewCore.java:53)
at android.webkit.WebViewCore$WebCoreThread$1.handleMessage(WebViewCore.java:
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:629)
at java.lang.Thread.run(Thread.java:1019)
Here's my code(shortened), which should be the same as in the samples:

Code:
public abstract class AbstractWebViewActivity extends Activity implements BaseActivity
{
    private Activity container;
    private WebView webView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().requestFeature(Window.FEATURE_PROGRESS);
        getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
        webView = new WebView(this);
        setContentView(webView);
        container = this;

        webView.setWebChromeClient(new WebChromeClient()
        {
            @Override
            public void onProgressChanged(WebView view, int progress) {
                container.setTitle("Loading...");
                container.setProgress(progress * 100);
                if (progress == 100) {
                    container.setTitle(R.string.app_name);
                }
            }
        });
    }

    protected WebView getWebView() {
        return this.webView;
    }
}
Code:
public class FacebookOAuthSignInActivity extends AbstractWebViewActivity
{

    private static final String TAG = FacebookOAuthSignInActivity.class.getSimpleName();
    private ConnectionRepository connectionRepository;
    private FacebookConnectionFactory connectionFactory;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWebView().getSettings().setJavaScriptEnabled(true);
        getWebView().setWebViewClient(new FacebookOAuthWebViewClient());
        this.connectionRepository = getAppContext().getConnectionRepository();
        this.connectionFactory = getAppContext().getFacebookConnectionFactory();
    }

    @Override
    public void onStart() {
        super.onStart();
        // display the Facebook authorization page
        getWebView().loadUrl(getAuthorizeUrl());
    }

    private String getAuthorizeUrl() {
        String redirectUri = getString(R.string.facebook_oauth_callback_url);
        String scope = getString(R.string.facebook_scope);
        OAuth2Parameters params = new OAuth2Parameters();
        params.setRedirectUri(redirectUri);
        params.setScope(scope);
        params.add("display", "touch");
        return this.connectionFactory.getOAuthOperations().buildAuthorizeUrl(GrantType.IMPLICIT_GRANT, params);
    }

    private void displayFacebookOptions() {
        Intent intent = new Intent();
        intent.setClass(this, GMapActivity.class);
        startActivity(intent);
        finish();
    }

    private class FacebookOAuthWebViewClient extends WebViewClient
    {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            // parse the captured url
            Uri uri = Uri.parse(url);
            String uriFragment = uri.getFragment();
            if (uriFragment != null && uriFragment.startsWith("access_token=")) {
                try {
                    // split to get the two different parameters
                    String[] params = uriFragment.split("&");

                    // split to get the access token parameter and value
                    String[] accessTokenParam = params[0].split("=");
                    String accessToken = accessTokenParam[1];
                    AccessGrant accessGrant = new AccessGrant(accessToken);
                    Connection<Facebook> connection = connectionFactory.createConnection(accessGrant);

                    try {
                        connectionRepository.addConnection(connection);
                    }
                    catch (DuplicateConnectionException e) {
                        // connection already exists in repository!
                    }
                }
                catch (Exception e) {
                }
                displayFacebookOptions();
            }
            if (uri.getQueryParameter("error") != null) {
                CharSequence errorReason = uri.getQueryParameter("error_description").replace("+", " ");
                Toast.makeText(getApplicationContext(), errorReason, Toast.LENGTH_LONG).show();
                displayFacebookOptions();
            }
        }
    }
}
In debug mode I can see that
Code:
WebViewDataBase.getInstance(context)
is invoced with context=null. But The context is given because of
Code:
webView = new WebView(this)
;

Unfortunately I couldn't find any ideas or solutions via internet research.

Any ideas? Do I miss something???
Thanks in advance!
Markus