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GMail OAuth authentication. Am I retreving the OAuth token correctly?

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Im trying to create a mockup for an application that accesses the Mail of users after OAuth authentication. I intend to retrieve the mail using the following code snippetBased off the example here :http://code.google.com/p/google-mail-oauth2-tools/source/browse/trunk/java/com/google/code/samples/oauth2/OAuth2Authenticator.java

/** * Performs OAuth2 authentication. * * <p>Before using this class, you must call {@code initialize} to install the * OAuth2 SASL provider. */public class OAuth2Authenticator {  private static final Logger logger =      Logger.getLogger(OAuth2Authenticator.class.getName());  public static final class OAuth2Provider extends Provider {    private static final long serialVersionUID = 1L;    public OAuth2Provider() {      super("Google OAuth2 Provider", 1.0,"Provides the XOAUTH2 SASL Mechanism");      put("SaslClientFactory.XOAUTH2","com.test.OAuth2SaslClientFactory");    }  }  /**   * Installs the OAuth2 SASL provider. This must be called exactly once before   * calling other methods on this class.   */  public static void initialize() {    Security.addProvider(new OAuth2Provider());  }  /**   * Connects and authenticates to an IMAP server with OAuth2. You must have   * called {@code initialize}.   *   * @param host Hostname of the imap server, for example {@code   *     imap.googlemail.com}.   * @param port Port of the imap server, for example 993.   * @param userEmail Email address of the user to authenticate, for example   *     {@code oauth@gmail.com}.   * @param oauthToken The user's OAuth token.   * @param debug Whether to enable debug logging on the IMAP connection.   *   * @return An authenticated IMAPStore that can be used for IMAP operations.   */  public static IMAPStore connectToImap(String host,                                        int port,                                        String userEmail,                                        String oauthToken,                                        boolean debug) throws Exception {    Properties props = new Properties();    props.put("mail.imaps.sasl.enable", "true");    props.put("mail.imaps.sasl.mechanisms", "XOAUTH2");    props.put(OAuth2SaslClientFactory.OAUTH_TOKEN_PROP, oauthToken);    Session session = Session.getInstance(props);    session.setDebug(debug);    final URLName unusedUrlName = null;    IMAPSSLStore store = new IMAPSSLStore(session, unusedUrlName);    final String emptyPassword = "";    store.connect(host, port, userEmail, emptyPassword);    return store;  }  /**   * Connects and authenticates to an SMTP server with OAuth2. You must have   * called {@code initialize}.   *   * @param host Hostname of the smtp server, for example {@code   *     smtp.googlemail.com}.   * @param port Port of the smtp server, for example 587.   * @param userEmail Email address of the user to authenticate, for example   *     {@code oauth@gmail.com}.   * @param oauthToken The user's OAuth token.   * @param debug Whether to enable debug logging on the connection.   *   * @return An authenticated SMTPTransport that can be used for SMTP   *     operations.   */  public static SMTPTransport connectToSmtp(String host,                                            int port,                                            String userEmail,                                            String oauthToken,                                            boolean debug) throws Exception {    Properties props = new Properties();    props.put("mail.smtp.starttls.enable", "true");    props.put("mail.smtp.starttls.required", "true");    props.put("mail.smtp.sasl.enable", "true");    props.put("mail.smtp.sasl.mechanisms", "XOAUTH2");    props.put(OAuth2SaslClientFactory.OAUTH_TOKEN_PROP, oauthToken);    Session session = Session.getInstance(props);    session.setDebug(debug);    final URLName unusedUrlName = null;    SMTPTransport transport = new SMTPTransport(session, unusedUrlName);    // If the password is non-null, SMTP tries to do AUTH LOGIN.    final String emptyPassword = "";    transport.connect(host, port, userEmail, emptyPassword);    return transport;  }  /**   * Authenticates to IMAP with parameters passed in on the commandline.   */  public static void main(String args[]) throws Exception {    /*if (args.length != 2) {      System.err.println("Usage: OAuth2Authenticator <email> <oauthToken>");      return;    }*/    String email = "myusername@gmail.com";//hard coded     String oauthToken = "4/ipdG328T75Z1RO-oU1ZpVx07-UY-.Mv7XkFpsg9USEnp6UAPFm0EIgurXgQI";// hard coded    initialize();    IMAPStore imapStore = connectToImap("imap.gmail.com",                                        993,                                        email,                                        oauthToken,                                        true);    System.out.println("Successfully authenticated to IMAP.\n");    SMTPTransport smtpTransport = connectToSmtp("smtp.gmail.com",                                                587,                                                email,                                                oauthToken,                                                true);    System.out.println("Successfully authenticated to SMTP.");  }

And Im trying to get the OAuth token using a web page similar to the one in this pagehttp://ocpsoft.org/java/setting-up-google-oauth2-with-java/by explicitly printing out the value of

request.getParameter("code")//value used for OAuth token in above code 

which is supposed to be the OAuth token.

But when I try to run the above program I get an error saying Invalid Credentials

Here's a detailed stack trace:

    DEBUG: setDebug: JavaMail version 1.5.0DEBUG: mail.imap.fetchsize: 16384DEBUG: mail.imap.statuscachetimeout: 1000DEBUG: mail.imap.appendbuffersize: -1DEBUG: mail.imap.minidletime: 10DEBUG: enable SASLDEBUG: SASL mechanisms allowed: XOAUTH2DEBUG: trying to connect to host "imap.gmail.com", port 993, isSSL true* OK Gimap ready for requests from 174.26.139.84 av9if2076257pac.214A0 CAPABILITY* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH AUTH=XOAUTH2 AUTH=PLAIN AUTH=PLAIN-CLIENTTOKENA0 OK Thats all she wrote! av9if2076257pac.214DEBUG IMAP: AUTH: XOAUTHDEBUG IMAP: AUTH: XOAUTH2DEBUG IMAP: AUTH: PLAINDEBUG IMAP: AUTH: PLAIN-CLIENTTOKENDEBUG: protocolConnect login, host=imap.gmail.com, user=vivekmahadevan.v@gmail.com, password=<non-null>IMAP SASL DEBUG: Mechanisms: XOAUTH2IMAP SASL DEBUG: SASL client XOAUTH2A1 AUTHENTICATE XOAUTH2+IMAP SASL DEBUG: challenge:  :IMAP SASL DEBUG: callback length: 1IMAP SASL DEBUG: callback 0: javax.security.auth.callback.NameCallback@57799932IMAP SASL DEBUG: response: user=vivekmahadevan.v@gmail.comauth=Bearer 4/ipdG328T75Z1RO-oU1ZpVx07-UY-.Mv7XkFpsg9USEnp6UAPFm0EIgurXgQI :dXNlcj12aXZla21haGFkZXZhbi52QGdtYWlsLmNvbQFhdXRoPUJlYXJlciA0L2lwZEczMjhUNzVaMVJPLW9VMVpwVngwNy1VWS0uTXY3WGtGcHNnOVVTRW5wNlVBUEZtMEVJZ3VyWGdRSQEB+ eyJzdGF0dXMiOiI0MDAiLCJzY2hlbWVzIjoiQmVhcmVyIiwic2NvcGUiOiJodHRwczovL21haWwuZ29vZ2xlLmNvbS8ifQ==IMAP SASL DEBUG: no responseA1 NO [ALERT] Invalid credentials (Failure)Exception in thread "main" javax.mail.AuthenticationFailedException: [ALERT] Invalid credentials (Failure)    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:660)    at javax.mail.Service.connect(Service.java:345)    at com.test.OAuth2Authenticator.connectToImap(OAuth2Authenticator.java:73)    at com.test.OAuth2Authenticator.main(OAuth2Authenticator.java:129)

Any insight would be appreciated. Thanks!


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