Run command in Github with

I have posted this before but there is no clear answer and this is really preventing me from moving forward. Thanks to those who have previously answered!

I have connected github with repl. Got everything in and continuously get some form of this message. What is a definitive “run” command for a java file!!!

This is the error now showing in the link below.
Thanks for helping!

© 2017 GitHub, Inc.
with by
GitHub Education