java: package com.google.u2f.server does not exist

[davide-giacomini]

I am trying to setup and use u2f-gae-demo, and, after importing all with maven and the Google App Engine plugin of IntelliJ, I am finding this issue when I run it: java: package com.google.u2f.server does not exist.

Moreover, I can run u2f-ref-code, but I cannot find the google chrome extension of u2f, not searching on Google, neither searching directly on the Google Extension Marketplace.

Does anyone know what may be the problems?

• Ubuntu 20.04.3 LTS
• IntelliJ
• Google App Engine plugin

PS: I am completely new to the Google Cloud Platform and hence to Google App Engine.