I have gone through the relatively simple task of upgrading JPivot to use JFreeChart 0.9.14. This was because of some bugs in JFreeChart 0.9.11 that made 3D bar charts not work very well for me. For JPivot, there were some slight changes in the API which have an effect on the ChartComponent and ChartFactory.
JFreeChart 0.9.15 is coming out on Friday which includes a fix I need. There will be a corresponding change to the JCommon library.
Do we want to include these upgrades in core JPivot now?