Google App Engine (GAE) is a fully managed serverless application platform from Google Cloud Platform that can be used for deploying simple applications. The platform supports various languages, including Java. JHipster provides a sub-generator, which is built and maintained by the Google Cloud team, to deploy to the App Engine easily. It makes use of the gcloud CLI and you need a Google Cloud account to use it.

Visit https://cloud.google.com/appengine/ for more information.