Java on Google App Engine

App Engine offers you a choice between two Java language environments. Both environments have the same code-centric developer workflow, scale quickly and efficiently to handle increasing demand, and enable you to use Google’s proven serving technology to build your web, mobile and IoT applications quickly and with minimal operational overhead. While the two environments have a lot in common, they differ in a few important ways.

Choose your preferred environment

Flexible environment

  • Full open source language runtimes.

  • Use any framework, library or binary of your choice.

  • Code is portable to anywhere that supports Docker containers.

  • Most cost-effective for applications that serve traffic continuously.

  • Java 8

Standard environment

  • Lightweight Java 7 runtime is optimized to scale nearly instantaneously to handle huge traffic spikes.

  • The performance optimized programming model limits the use of native code, access to the file system and some network activities. Learn more

  • Uses proprietary APIs to simplify common tasks like database access, queuing and in-memory caching.

  • Most cost-effective for applications that have significant periods where they are not serving traffic.

  • Java 7

Choosing an environment

You can run an App Engine application in two environments, the standard environment and the flexible environment. See a summary of differences between the two environments.
Learn more

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App Engine Documentation