Anything for a fellow linux user! It's developed on linux so it should work, not really sure what's up with the jar file, only tried it on Windows, and probably wine wine :) ... But since it seems you're familiar with a shell, I've just uploaded the class file for you:
http://galimulator.com/MapBitter.class
> java MapBitter lovelyearth.bmp
I will do my best to process: lovelyearth.bmp for you
Land pixels: 214385
Sea pixels: 707215
Map successfully save to: lovelyearth.bits