www.jfree.org

Use the
ChartUtilities.writeChartAsJPEG(out, chart, getWidth(), getHeight());
in a servlet or JSP that handles displaying each chart.

Inside another JSP or servlet, have it contain an <IMG> tag for each chart that calls the JSP.

ChartUtilities.writeChartAsJPEG(out, chart, width, height);

That class should be in the jcommons.jar which it should find if your classpath is correct. Determining that depends on your setup.