These client libraries are officially supported by Google. However, these libraries are considered complete and are in maintenance mode. This means that we will address critical bugs and security issues, but will not add any new features. If you're working with Google Cloud Platform APIs such as Datastore, Pub/Sub and many others, consider using the Cloud Client Libraries for Java instead. These are the new and idiomatic Java libraries targeted specifically at Google Cloud Platform Services. The Google APIs Client Library for Java is a flexible, efficient, and powerful Java client library for accessing any HTTP-based API on the web, not just Google APIs.