App Engine Documentation Flexible Environment Java Documentation Concepts An Overview of App Engine An Overview of App Engine An explanation of App Engine services, the building blocks of App Engine applications. About the Java Flexible Environment About the Java 8 / Jetty 9.3 Runtime About the Java 8 / Jetty 9.3 Compat Runtime About the Java 8 Runtime How Requests are Routed and Handled How Requests are Routed How HTTP requests from users and other applications can be routed using dispatch files. How Requests are Handled How requests to your application are understood and handled within App Engine. How Instances are Managed How Instances are Managed How Google manages the health checks, uptime, restarts, and location of your instances. 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.