How to use Firebase emulator to test Java cloud functions with Firestore trigger?

Question

I'm trying to use Java11 runtime for Google cloud/firebase functions, which was quite recently released. I want to test firestore trigger functions on my local machine. Guides on the internet seem to be using the command firebase functions:shell which by itself starts the required emulation processes. However, I don't find any method to specify the .jar file for the firebase functions:shell command. Or any way to specify the functions. I know it doesn't load my Java http function because it shows the loaded functions and helloWorld isn't one of them:

gintas-mac:functions gintas$ firebase functions:shell
⚠  Your requested "node" version "10" doesn't match your global version "8"
i  functions: Loaded functions: helloWorld
⚠  functions: The following emulators are not running, calls to these services will affect production: firestore, database, pubsub

Firebase Functions only allows Nodejs as a runtime. One thing you could try is to use Cloud Functions for the Java11 runtime and take a look at the Functions Framework for Java to test them locally. — llompalles
– llompalles, Commented Jul 10, 2020 at 11:48

Doug Stevenson · Accepted Answer · 2020-07-10 17:13:12Z

1

It's not possible to use the Firebase CLI to test a function written in Java. Firebase only supports functions written with the firebase-functions module on nodejs.

answered Jul 10, 2020 at 17:13

Doug Stevenson

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