Angstrom can show a splash screen within 2-3 seconds, and full bootup at 8-10 seconds. You will just need to disable X and the other services that you do not need and start your java app as a service.
Thank you for your recommendation, Brent. As experimentation has led me to believe, it seems I need an X server in order to run a GUI java app. I get a headlessException at the command prompt otherwise. If I’m missing something, please let me know. I’ve been spinning my wheels with this for a while.
I think you need to check to see if java has framebuffer support. I’ve only used java console apps, so I can’t say for sure. I typically use Qt for anything were I need a UI and this has framebuffer support.