posted 16 years ago
Both JChart2D and JFreeChart are licensed under the LGPL, so I'm not sure what license/purchase issues you have in mind.
If performance is a problem depends on the concurrency that you encounter in your web app. Image generation does take a bit of CPU time, so if 100 users request charts simultaneously, there will probably be a delay.
[ October 16, 2007: Message edited by: Ulf Dittmer ]