问题
Do I need to deploy an App (even a dummy one) on the App Engine in order to use the Datastore service using the google-cloud-datastore Java API from a client such as a Compute Engine running in the google cloud?
回答1:
No, you don't need to deploy an AppEngine app to access the Google Cloud Datastore. You just need to create a project from the Console and you can connect to the Datastore in the project from anywhere using the google-cloud-datasource API.
来源：https://stackoverflow.com/questions/40401696/is-an-app-engine-instance-required-for-accessing-datastore