// and can be used in place of a service account.
Credential oAuth2Credential = new OfflineCredentials.Builder().forApi(Api.ADWORDS).fromFile()
.build().generateCredential();
// Construct an AdWordsSession.
AdWordsSession session =
new AdWordsSession.Builder().fromFile().withOAuth2Credential(oAuth2Credential).build();
AdWordsServices adWordsServices = new AdWordsServices();
Long feedId = Long.valueOf("INSERT_FEED_ID_HERE");