Java is not free (no sources), requires a license
Kaffe is GPLed (with complete sources). Kaffe has been rebuilt
completely from the specs (proof of suitability)
Java is too slow (interpreter)
Kaffe has JIT (see performance and WAT
(by means of Cygnus GCJ). We (all) can still make it even faster (GC, libs,..).
Java AWT needs Motif
Kaffe has Xlib (lightweight widgets) and GTK (native widgets) AWTs
It's just for fun, why to use a new environment
Can we really afford this? Ramification can be dangerous
(what is the deal to publish something that will be unnoticed).