www.jfree.org

I think this will result in the chart not being in session and the chart will be generated from scratch everytime, which will slow the performance. I will only slow the performance, when you want reuse the chart. But in most cases the image is intended to be actual, so this behavior is disired anyw...

OK, I have to specify. I don't understand how your source should work. As I said, I miss the code for transmitting the image to the browser.

You know, Java claims: "Write once, run anywhere" So try this first.

In case of problems: "Write once, debug everywhere"

What is a dynamic barchart?

I don't see the code for this:

Maybe this helps:
http://www.jfree.org/phpBB2/viewtopic.php?t=15804

A directory name null?

Sorry, I can't help you with the titel-stuff.

Something like that ChartRenderingInfo cri = new ChartRenderingInfo(); String filename1 = ""; try { filename1 = ServletUtilities.saveChartAsPNG(chart1, 790, 430, cri, null); } catch (IOException ex) { logger.error(ex); throw new RuntimeException(ex.getMessage()); } String map1=ChartUtilities.getImag...

You've included a bunch of frameworks and libraries so it is difficult to say what is going wrong. Try to isolate the problem.

You use a differnent name for the map and the name of the map that the image is using:

<map id="imagemap" name="imagemap"></map>
<img src="/SPC/spcchart?width=700&height=600" usemap="#map">

Something like that

There are many charts in JRobin: http://oldwww.jrobin.org/gallery.html

jansyndesis wrote: does the developer guide that is available for purchase give a proper working example for GWT + JFree?

Not in the last 1.02 version.