in java-experimental overlay, tomcat-5.5.16 only has a ~x86 keyword. I have added the ~amd64 keyword in my local overlay and tested this, and everything seems to work fine (till now). Please could someone add the ~amd64 keyword to this ebuild?
Hmmmm, better ask the people who run the overlay...
The java team does run this particular overlay.
Was actually working on keywording this before you filed. Should be fixed now, if you do an svn update.