Are there any debugging tools/techniques for JFreeChart somewhere? I am becoming very frustrated trying to determine why my timeseries plot is not generating any lines. Everything on the chart looks correct and I seem to be updating the datasets correctly but no lines show up. I have try/catch blocks but they are not producing any errors. I have no idea what I can do to determine why no lines are being generated without some kind of error or trace that will point me at the problem. The only possible hint I have is that when I set legend to true, no legend is displayed either. Unfortunately I don't know if that is supposed to show up only after the first datapoint is set or if it is supposed to show up regardless. TIA.