How to keep App Engine Servlet Listening to Firebase

Question

I am following the tutorial at: https://cloud.google.com/solutions/mobile/firebase-app-engine-android-studio

I have everything working and the email is sending every

Answer 1

Your question is actually a question about AppEngine and how to create a Servlet that starts automatically and automatically performs some initialization.

You will want to keep manual scaling on, but follow the steps here: https://cloud.google.com/appengine/docs/java/config/appconfig#using_a_load-on-startup_servlet

for setting up your listeners on init() instead of an http request. What you are trying is definitely possible and have seen it run elsewhere.