These ebuilds come from http://overlays.gentoo.org/proj/java.
If you have some problems, go to the official site first.
proxymusic : MusicXML library for Java ( https://proxymusic.dev.java.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a java-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/java-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org