Are you trying to use Jikes to build the server? From what I understand, Jikes is the logical equivalent of javac, that is a compiler tool, not a vitual machine.
Weston M. Price
you need to modify webdefaults.xml, currently, but not for much longer, inside ..../deploy/jbossweb.sar/org.mortbay.jetty.jar.
Look on jetty.mortbay.org for documentation about this, or read the comments in the webdefault.xml