Actually, it does work without source code (or, should work)

The left side 'CallTree' is fully functional, and shows owner instances, arguments and return values. If you click those, then the Object/Array is displayed at bottom and is expandable just like in normal debugger (+slider to change debug time). So only the right side "Source" view is missing if you don't have source.

If the above doesn't work, could you get in touch and I'll get it sorted out? https://support.bugjail.com

And fully agreed on Java 9+ support, coming in next beta.

Thanks for the feedback!