As per summary; I masked the package, you might want to replace the ebuild with a snapshot one instead.
*jsr305-1.0-r1 (15 Oct 2010) 15 Oct 2010; Steve Arnold <nerdboy@gentoo.org> -jsr305-1.0.ebuild, +jsr305-1.0-r1.ebuild: Switched from svn -r checkout to src tarball (for unmasking). Seems to have been fixed quiet a while ago.