If you use the java overlays see the following link:
http://overlays.gentoo.org/proj/java/wiki/March_2007_Summary#Changesinoverlays
The changes should allow a better experience to users of our overlays as we now have one central overlay where things are expected to work for layman usage and after we get it cleaned there shouldn’t be any experimental work in there. Initially I just moved migrated-java-experimental-overlay as java-overlay so initially there is still some experimental stuff left in that overlay but they should not have any keywords. If you have any problems, use our mailing list or IRC channel to get help.