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    <p>You are not using OAuth 2.0 but OAuth 1.0 with HMAC-SHA1 as the signature method. To use OAuth 2.0, you need at least version 1.47.0 of the <a href="http://code.google.com/p/gdata-java-client/" rel="noreferrer">gdata-java-client</a> library and version 1.8.0-beta of the <a href="http://code.google.com/p/google-oauth-java-client/" rel="noreferrer">google-oauth-java-client</a> library.</p> <p>Using the <a href="http://code.google.com/p/google-api-java-client/" rel="noreferrer">google-api-java-client</a> library provides helper classes to deal with Google's OAuth 2.0 implementation. </p> <p>To retrieve OAuth 2.0 credentials, you can use this code snippet:</p> <pre><code>import com.google.api.client.auth.oauth2.Credential; import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeRequestUrl; import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest; import com.google.api.client.googleapis.auth.oauth2.GoogleCredential; import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse; import com.google.api.client.http.HttpTransport; import com.google.api.client.http.javanet.NetHttpTransport; import com.google.api.client.json.jackson.JacksonFactory; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays; import java.util.List; public class MyClass { // Retrieve the CLIENT_ID and CLIENT_SECRET from an APIs Console project: // https://code.google.com/apis/console static String CLIENT_ID = "&lt;YOUR_CLIENT_ID&gt;"; static String CLIENT_SECRET = "&lt;YOUR_CLIENT_SECRET&gt;"; // Change the REDIRECT_URI value to your registered redirect URI for web // applications. static String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob"; // Add other requested scopes. static List&lt;String&gt; SCOPES = Arrays.asList("https://docs.google.com/feeds"); /** * Retrieve OAuth 2.0 credentials. * * @return OAuth 2.0 Credential instance. */ static Credential getCredentials() throws IOException { HttpTransport transport = new NetHttpTransport(); JacksonFactory jsonFactory = new JacksonFactory(); // Step 1: Authorize --&gt; String authorizationUrl = new GoogleAuthorizationCodeRequestUrl(CLIENT_ID, REDIRECT_URI, SCOPES).build(); // Point or redirect your user to the authorizationUrl. System.out.println("Go to the following link in your browser:"); System.out.println(authorizationUrl); // Read the authorization code from the standard input stream. BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); System.out.println("What is the authorization code?"); String code = in.readLine(); // End of Step 1 &lt;-- // Step 2: Exchange --&gt; GoogleTokenResponse response = new GoogleAuthorizationCodeTokenRequest(transport, jsonFactory, CLIENT_ID, CLIENT_SECRET, code, REDIRECT_URI).execute(); // End of Step 2 &lt;-- // Build a new GoogleCredential instance and return it. return new GoogleCredential.Builder().setClientSecrets(CLIENT_ID, CLIENT_SECRET) .setJsonFactory(jsonFactory).setTransport(transport).build() .setAccessToken(response.getAccessToken()).setRefreshToken(response.getRefreshToken()); } // … } </code></pre> <p>Once you have the OAuth 2.0 credential, you can authorize a service object as follow:</p> <pre><code>// ... import com.google.api.client.auth.oauth2.Credential; import com.google.gdata.client.docs.DocsService; import com.google.gdata.data.docs.DocumentListEntry; import com.google.gdata.data.docs.DocumentListFeed; import com.google.gdata.util.ServiceException; // ... import java.io.IOException; import java.net.URL; // ... public class MyClass { // … /** * Print document entries using the provided authorized DocsService. * * @param credential OAuth 2.0 credential to use to authorize the requests. * @throws IOException * @throws ServiceException */ static void printDocuments(Credential credential) throws IOException, ServiceException { // Instantiate and authorize a new DocsService object. DocsService service = new DocsService("&lt;YOUR_APPLICATION_NAME&gt;"); service.setOAuth2Credentials(credential); // Send a request to the Documents List API to retrieve document entries. URL feedUri = new URL("https://docs.google.com/feeds/default/private/full/"); DocumentListFeed feed = service.getFeed(feedUri, DocumentListFeed.class); for (DocumentListEntry entry : feed.getEntries()) { System.out.println("Title: " + entry.getTitle().getPlainText()); } } // ... } </code></pre> <p>The <code>CLIENT_ID</code>, <code>CLIENT_SECRET</code> can be retrieved from the <a href="https://code.google.com/apis/console" rel="noreferrer">APIs Console</a> and the <code>REDIRECT_URI</code> must match one that has been registered with your API Project.</p>
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    1. COThanks. You were right. Fixed already to run with OAuth2. But your code has an error, this sentence is backwards: .setRefreshToken(response.getAccessToken()).setAccessToken(response.getRefreshToken());
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    2. COThanks, I fixed the sample :-)
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    3. COcan you provide the link for maven dependency for this jar google-api-java-client ?
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