The JFreeChart Download page says
JFreeChart requires the JCommon class library. The JCommon runtime jar file is included in the JFreeChart download --- if you require the source code for JCommon (recommended), you need to download this separately."
So I tried to download JCommon but without success:
http://www.jfree.org/jcommon/ has a Download link, but it retrieves JFreeChart instead of JCommon
http://sourceforge.net/project/showfile ... e_id=40079