I can't emerge spring-1.2.8 from java-migration-packages overlay because the needed irmi from http://gentooexperimental.org/distfiles/irmi-1.0.0.tar.bz2 does not exist ! irmi is needed by carol-2.0.5 but in the main page of carol project irmi seem to me integrated in the carol source now...
This was fixed at some point to point at my devspace. Make sure you are up to date with the svn repo. Thanks for reporting.