Is Groov client running and editing using Web-launch?

Excuse me, is Groov’s client running and editing using the Web-launch method?
If so, why is my client not asking to install JAVA?

Some confusion in the terms used here, so forgive me if I am totally wrong in my ‘answer’…

My guess is that its not groov’s client you are talking about, but Ignition Edge Designer.
Yes, it is using Web-Launch method. You might be missing the first dialog as its easy to just click yes and move on. Take a close look;

If you already have Java installed, it just opens and works.

If you are indeed talking about groov View and groov View Build mode, then NO. It does NOT use Java. Pure HTML5. That would be why groov View is not asking to install Java as it does NOT need it.