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

It seems like this is a known issue based on their release notes for firebase-admin version 4.0.0 (November 7, 2016) and version 4.0.1 (November 8, 2016):

ISSUE: This version was compiled for Java 8 and does not support Java 7. This will be fixed in an upcoming release.

I guess we'll have to wait ;)

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UPDATE:

As per their release notes, it is now fixed in version 4.0.2 - November 15, 2016:

FIXED This update restores Java 7 compatibilty for the Admin Java SDK.