Microservice on GAE+ Mix of Standard and Flexible GAE Services

Question

We have two separate projects as follows

1. GAE Standard on JAVA runtime, let us say- APP1
2. GAE Flexible on Python runtime, let us say- APP2

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Answer 1

Yes, it is possible to have any mix of environments and languages as separate services inside of the same GAE application. While not explicitly mentioned, it is implied by the code isolation of services. From App Engine Services as microservices:

Code can be deployed to services independently, and different services can be written in different languages, such as Python, Java, Go, and PHP.

You just need to take care of:

• deploying the default service first, see https://stackoverflow.com/a/42361987/4495081
• deploying the app-level configurations shared by all services: dispatch, cron, queue, etc.