While I realize no one is actively working on this project at the moment, I thought I would add my desired feature request here in case anyone does decide to work on Java GB again in the future.
I would love to see a little GUI ROM Builder added to Java GB that lets you bundle your own ROMs into the .jar installation file so they are easily accessible to the app once it is installed on your cell phone. MeBoy has a ROM Builder that works like this, however in my opinion Java GB a better gameboy emulator overall, despite it lacking this one feature.
Thanks for your time. Java GB is a great emulator, and even without this feature I appreciate all the work put into making it.