Spring MVC Web Application - best Framework to Draw charts

I am starting to learn Spring Framework by developing a web trade application which displays a huge number of banking charts related to trade results . Basing in my google search , I checked up many APIs to be used for charts displaying like JFreeChart , Google charts , jqPlot

The client requirement is to display dynamic charts based in database results and export in excel/ pdf reports ( Jasper seems to be heavy for this task)

I wonder What's the most appropriate api to integrate with Spring MVC . Your advice will be to to helpful / Thanks in advance .