How to Create Dynamically Generated Charts in Portlets
A technical article just published on developers.sun.com, Creating Dynamically Generated Charts in Portlets, steps you through the process of building dynamic images on JSR 168-compliant portlets by means of the open-source JFreeChart library APIs. Mainly, it involves the creation of a portlet.xml file. A flow chart in the article clearly illustrates the sequence of events.Dynamic graphics are a neat thing to do for portals. Do give it a whirl!