Try Implicit Grant

Running the application:

1. Visit the URL http://localhost:8080/playground2/oauth2.jsp to start the application.

2. Enter the following details and click Authorize.

   Authorization Grant Type: Implicit
   Client ID: (the client id received at the application registration)
   Callback URL: http://localhost:8080/playground/oauth2client
   Authorize Endpoint: https://localhost:9443/oauth2/authorize

   

3. Log in with the user.
   
4. Click Approve to consent to this action.
   
5. At this point the application receives the Access Token.
   
6. Click on Get Photos.

7. Now you should be able to see the user photos.