At the moment, building Jikes RVM with -Dclasslib.provider=Harmony fails, as the download URLs of several upstream dependencies have changed. The Apache Harmony SVN has moved to http://svn.apache.org/repos/asf/harmony/enhanced/java/trunk/classlib, for example, and several URLs in its build scripts are outdated as well. The attached patch fixes both the URLs in Jikes RVM's own build scripts as well as in Harmony's.
Jikes RVM SVN r16017
Linux 2.6.31-22-generic #67-Ubuntu SMP Sat Oct 16 19:10:07 UTC 2010 i686 GNU/Linux