Java Gtk

http://hanynowsky.wordpress.com/2012/06/10/create-gtk-based-java-applications-on-linux-with-java-gtk-library/

http://java-gnome.sourceforge.net/

http://www.linuxjournal.com/article/8111?page=0,1

http://zetcode.com/gui/javagnome/ 
http://danny.damours.net/wordpress/creating-a-gtk-app-in-java-using-java-gnome