Jeode on Zaurus uses QT-Embedded for AWT bindings. I'm not sure they have GTK bindings. And why would Nokia buy this when they have java running on most Nokia phones so their in-house experince with java is probably pretty high? I suppose they may even have Jazelle acceleration (available in N770's CPU too) licenced for their phones already. Maybe they just don't want java on N770 now or those licences per device are not reasonable or the licence doesn't fit the idea of having device made with open source software, who knows. Or maybe it is just too much work to integrate java into maemo properly so they are working on more cool features like VOIP first and java will come after that.