Java 11 Support

[daswass]

Is there any plan to support Java 11? As of the 393.0.0 gcloud SDK, the Datastore Emulator has removed support for Java 8, so anyone using the Datastore with good test coverage is going to be stuck on version 392.0.0 until Cloud Endpoints does provide Java 11 support.

[daswass]

I was able to deploy successfully with Java 17 after upgrading the dependency version of com.google.appengine:appengine-api-1.0-sdk to 2.x. This can be closed.