Pie Chart Sales by Category Products

I was looking everywhere how to update jasperreports to the last version, but the only clue seems to modify the openbravo pos sources and compiling it. Am I right or there another way to update the libraries?

Have you tried this?
http://forge.openbravo.com/projects/pos ... 4908db0417

I think you need to update some additional files from Libraries.

see this link: viewtopic.php?group_id=304&f=886558&t=7012043

Thanks, but I already did that before my last post.
After uninstalling and reinstalling Openbravo Pos several times I gave up. No matters what update system I use, editing the start.bat or just renaming and overwritting files, same result, error.

All custom reports worked very well except Andrej´s ones, all of them are broken in my Openbravo installation.

Thank you all for your support.
For records Im using
Windows XP SP3 Spanish
Java 6(TM) Update 26