Bug to track this problem in rpm-4.3-0.10 (and 0.9.1, sadly :)
This affects ant and tomcat. I've only seen it on x86_64, but this
may be because the hammers are faster than the other beehive machines
and are beating them to it.
Actually, it only seems to happen on loma.devel. Other hammer boxes
and other archs seem to build it just fine.
FIxed in rpm-4.3-0.22 and rpm-4.2.2-0.14 afaik.