cvs ... co -r JBoss_3_0_6 jboss-3.0
You don't need xdoclet or ant the correct
versions are included in cvs.
I'm getting the same error. I downloaded the latest source from CVS and tried to run build/build.bat and it gives me the same error. I couldn't find any reference to any other setup that was required. Did you ever fix your problem? If so, how?