Class GoogleRefreshTokenRequest (2.0.1)

 static void refreshAccessToken() throws IOException {
   try {
     TokenResponse response = new GoogleRefreshTokenRequest(
         new NetHttpTransport(), new GsonFactory(),
         "tGzv3JOkF0XG5Qx2TlKWIA", "s6BhdRkqt3",
 "7Fjfp0ZBr1KtDRbnfVdmIw").execute();
     System.out.println("Access token: " + response.getAccessToken());
   } catch (TokenResponseException e) {
     if (e.getDetails() != null) {
       System.err.println("Error: " + e.getDetails().getError());
       if (e.getDetails().getErrorDescription() != null) {
         System.err.println(e.getDetails().getErrorDescription());
       }
       if (e.getDetails().getErrorUri() != null) {
         System.err.println(e.getDetails().getErrorUri());
       }
     } else {
       System.err.println(e.getMessage());
     }
   }
 }