xmlbeans
Latest source from http://svn.apache.org/repos/asf/xmlbeans/trunk/. Some changes have been made to get the build working.
Release 2.6.1 includes a fix for https://bz.apache.org/bugzilla/show_bug.cgi?id=54084
Sample
https://github.com/pjfanning/poi-xmlbeans-patch-test
Build
./xbeanenv.sh
ant
ant checkintest
Output jar is found at build/lib/xbean.jar