Unable to deploy to Google App Engine : java.lang.IllegalArgumentException: Class file is Java 8 but max supported is Java 7

Question

Got this error while trying to setup Firebase Admin SDK

Preparing to deploy: Created staging directory at: \'C:\\Users\\Parag\\AppData\\Local\\Temp\\ap

Answer 1

At this time, it appears as though the firebase-admin-sdk is intended to be used on the Google Flexible Environment instead of the Standard Environment.

https://cloud.google.com/appengine/docs/flexible/java/flexible-for-standard-users

A comparable package for the Standard Environment would be firebase-server-sdk.

https://mvnrepository.com/artifact/com.google.firebase/firebase-server-sdk

However, references to the original server sdk documentation now forward to the admin sdk documentation. So, perhaps they will release an update to the Standard Environment that supports Java 8, or an update to the admin sdk that works on Java 7.