401 Error Unknown authorization receiving Google calendars

When I execute CalendarService.setOAuthCredentials (oauthParameters, new OAuthHmacSha1Signer ()); I get the OAuthException 401 authorization header Unknown Unknown.

I am using GWT + GAE. I don't know why I get this error, oauthParameters seems to be in order.

• I get user login loginService.login
• I check if I have authentication already enabled oauthService.checkOauthTokenSecret
• If not, I will do a redirect to Google Page Aproval for GCalendar permission
• I get the querystring returned by Google, and I get the Token access and Secret access token and set it to a custom object for later use on oauthService.upgradeLogin.
• And trying to get calendars at oauthService.getPublicCalendars.

I am using the MVP template with the mvp4g framework, sorry if a little confusing 0 :-)

Any idea why I am getting 401 error? I think it is something that I go up and down the client and server and external pages ... and something is missing :-( but all the parameters seem to be filled correctly.

Client side

public void onStart(){
    GWT.log("onStart");
    loginService.login(GWT.getHostPageBaseURL(), new AsyncCallback<LoginInfo>() {
        @Override
        public void onSuccess(LoginInfo result) {
            Common.loginInfo = result;
            if(Common.loginInfo.isLoggedIn()) { 
                oauthService.checkOauthTokenSecret(new AsyncCallback<String>() {
                    @Override
                    public void onSuccess(String result) {
                        if (result == null){
                            eventBus.OauthLogin();
                        }else{
                            oauthService.upgradeLogin(Window.Location.getQueryString(),Common.loginInfo, new AsyncCallback<LoginInfo>() {
                                @Override
                                public void onSuccess(LoginInfo result) {
                                    Common.loginInfo = result;
                                    getCitas();
                                }
                                @Override public void onFailure(Throwable caught) {
                                    Common.handleError(caught);                         
                                }
                            });
                        }
                    }
                    @Override public void onFailure(Throwable caught) {
                        Common.handleError(caught);                         
                    }
                });
            }else{
                eventBus.LoadLogin();
            }
        }
        @Override public void onFailure(Throwable caught) {
            Common.handleError(caught);
        }
    });
}

Server side

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletContext;

import com.google.gdata.client.authn.oauth.GoogleOAuthHelper;
import com.google.gdata.client.authn.oauth.GoogleOAuthParameters;
import com.google.gdata.client.authn.oauth.OAuthException;
import com.google.gdata.client.authn.oauth.OAuthHmacSha1Signer;
import com.google.gdata.client.authn.oauth.OAuthParameters;
import com.google.gdata.client.calendar.CalendarService;
import com.google.gdata.data.calendar.CalendarEntry;
import com.google.gdata.data.calendar.CalendarFeed;
import com.google.gdata.util.ServiceException;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
import com.rdt.citas.client.OAuthoritzationService;
import com.rdt.citas.client.shared.LoginInfo;

public class OAuthoritzationServiceImpl extends RemoteServiceServlet 
implements OAuthoritzationService {

/**
 * 
 */
private static final long serialVersionUID = 1L;

private static final Logger log = Logger.getLogger(OAuthoritzationServiceImpl.class.getName());

private static String KEY_PARAM = "oauth_consumer_key";
private static String SECRET_PARAM = "oauth_consumer_secret";
private static String SCOPE_PARAM = "scope_calendars";
private static String CALLBACK_PARAM = "oauth_callback";


public String checkOauthTokenSecret(){

    ServletContext context = this.getServletContext();
    getOauthParams(context);

    return (String) this.getThreadLocalRequest().getSession().getAttribute("oauthTokenSecret");;
}

public String getApprovalOAuthPageURL() throws IOException{

    ServletContext context = this.getServletContext();
    getOauthParams(context);

    GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();

    oauthParameters.setOAuthConsumerKey(getFromSession(KEY_PARAM));
    oauthParameters.setOAuthConsumerSecret(getFromSession(SECRET_PARAM));
    oauthParameters.setScope(getFromSession(SCOPE_PARAM));
    oauthParameters.setOAuthCallback(getFromSession(CALLBACK_PARAM));
    GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(new OAuthHmacSha1Signer());

    try {                       
        oauthHelper.getUnauthorizedRequestToken(oauthParameters);

        String approvalPageUrl = oauthHelper.createUserAuthorizationUrl(oauthParameters);
        String oauthTokenSecret = oauthParameters.getOAuthTokenSecret();

        this.getThreadLocalRequest().getSession().setAttribute("oauthTokenSecret", oauthTokenSecret);

        return approvalPageUrl;

    } catch (OAuthException e) {
        log.log(Level.WARNING,e.toString());
        return "";
    } finally{
    }

}

public LoginInfo upgradeLogin(String queryString, LoginInfo login){
    // receiving '?key1=value1&key2=value2
    queryString = queryString.substring(1, queryString.length());
    String k = getFromSession(KEY_PARAM);
    String s = getFromSession(SECRET_PARAM);

    GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
    oauthParameters.setOAuthConsumerKey(k);
    oauthParameters.setOAuthConsumerSecret(s);

    String oauthTS = (String) this.getThreadLocalRequest().getSession().getAttribute("oauthTokenSecret");//oauthParameters.getOAuthTokenSecret();
    oauthParameters.setOAuthTokenSecret(oauthTS);

    GoogleOAuthHelper oauthHelper = new GoogleOAuthHelper(new OAuthHmacSha1Signer());
    oauthHelper.getOAuthParametersFromCallback(queryString,oauthParameters);

    login.setQueryStringTokens(queryString);
    login.setAccessTokenSecret(oauthTS);

    try {
        String accesToken = oauthHelper.getAccessToken(oauthParameters);
        login.setTokenSecret(accesToken);
    } catch (OAuthException e) {
        log.log(Level.WARNING,e.toString());
    }
    return login;
} 

public ArrayList<String> getPublicCalendars(String accessToken, String accessTokenSecret){
    ArrayList<String> result = new ArrayList<String>();
    CalendarFeed calendarResultFeed = null;

    GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters();
    oauthParameters.setOAuthConsumerKey(getFromSession(KEY_PARAM));
    oauthParameters.setOAuthConsumerSecret(getFromSession(SECRET_PARAM));
    oauthParameters.setOAuthToken(accessToken);
    oauthParameters.setOAuthTokenSecret(accessTokenSecret);            
    oauthParameters.setOAuthType(OAuthParameters.OAuthType.THREE_LEGGED_OAUTH);
    oauthParameters.setScope(getFromSession(SCOPE_PARAM));

    CalendarService myService = new CalendarService("exampleCo-exampleApp-1");                  

    try {
        myService.setOAuthCredentials(oauthParameters, new OAuthHmacSha1Signer());
        URL calendarFeedUrl = new URL("https://www.google.com/calendar/feeds/default/owncalendars/full");
        calendarResultFeed = myService.getFeed(calendarFeedUrl, CalendarFeed.class);
    } catch (OAuthException e) {
        log.info("OAuthException");
        log.log(Level.WARNING,e.toString());
        e.printStackTrace();
    } catch (MalformedURLException e) {
        log.info("MalformedURLException");
        log.log(Level.WARNING,e.toString());
        e.printStackTrace();
    } catch (IOException e) {
        log.info("IOException");
        log.log(Level.WARNING,e.toString());
        e.printStackTrace();
    } catch (ServiceException e) {
        log.info("ServiceException");
        log.log(Level.WARNING,e.toString());
        e.printStackTrace();
    }

    if (calendarResultFeed != null && calendarResultFeed.getEntries() != null) {
        for (int i = 0; i < calendarResultFeed.getEntries().size(); i++) {
            CalendarEntry entry = calendarResultFeed.getEntries().get(i);
            result.add(entry.getTitle().getPlainText());              
        } 
    }
    return result;
}


private void getOauthParams(ServletContext context) {
    this.getThreadLocalRequest().getSession()
        .setAttribute(KEY_PARAM, context.getInitParameter(KEY_PARAM));
    this.getThreadLocalRequest().getSession()
        .setAttribute(SECRET_PARAM, context.getInitParameter(SECRET_PARAM));
    this.getThreadLocalRequest().getSession()
        .setAttribute(SCOPE_PARAM, context.getInitParameter(SCOPE_PARAM));
    this.getThreadLocalRequest().getSession()
        .setAttribute(CALLBACK_PARAM, context.getInitParameter(CALLBACK_PARAM));
}

private String getFromSession(String param){
    return (String) this.getThreadLocalRequest().getSession().getAttribute(param);
}

}