The sample app performs authorization code grant specified in the OAUTH 2 RFC, and receives user’s authorization code via an embedded Jetty HTTP server. That code is then exchanged for an access token.
Clone the google-oauth-java-client repo at GitHub
git clone email@example.com:google/google-oauth-java-client.git
Install Apache Maven if you don’t already have it. You’ll need Oracle’s JDK to use Maven and compile the sample app. On Mac OS X, Maven can be installed using Homebrew
brew install maven
Head into the cloned repo and compile
cd google-oauth-java-client mvn compile
Head into the sample app folder and execute the sample app
cd samples/dailymotion-cmdline-sample mvn -X exec:java -Dexec.mainClass="com.google.api.services.samples.dailymotion.cmdline.DailyMotionSample"
The first execution will fail. You’ll need to create a dailymotion.com developer account, which can be created at http://www.dailymotion.com/profile/developer. Create a new API key. The only value that really matters is the Callback URL which should be http://127.0.0.1:8080/Callback.
Enter your API credentials in rc/main/java/com/google/api/services/samples/dailymotion/cmdline/OAuth2ClientCredentials.java. Compile and exec again. The application should list your favorite videos if all goes well.