Unable to run a new java swing app

I created a new Java Swing app, but it doesn’t seem to run. The output window just spins


Is this the output you want to see :
Or what do you want to see?

No, I don’t see that. What browser are you using?

Chrome, I see it when I run the repl!

Weird! OK thanks…I’ll try it on another computer maybe.

Same computer, but a different network and it works! Must be something wonky with the firewall at my local community college.


Yeah, the same thing happens at my district. They switched filters this year and it never works, no matter how much IT tries to get it to. So no graphics for my students…