Firebase Docs Reference com.google.firebase Classes FirebaseApp The entry point of Firebase SDKs. FirebaseOptions Configurable Firebase options. FirebaseOptions.Builder Builder for constructing FirebaseOptions. Exceptions FirebaseException Base class for all Firebase exceptions. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated January 24, 2017.