On Mar 2, 2011, at 11:32 AM, Samuel W. Brett (SWB) wrote: > Okay, here are the problems I am having. scheduleImmediateRepast > method > is deprecated in my version of Mason. Frame.show() is deprecated as > well, not sure that matters as I guess the pack method takes care of > that now. Ah right. Don't worry about that. These methods will still work but you're right, they might go away. Instead, use scheduleRepeatingImmediatelyAfter(new Steppable() { ... }); and Frame.setVisible(true); pack() does not set a frame to visible to my knowledge. > The chart never gets initialized in my init method for some > reason. When the start method is called, chart is null. In the version of the code I sent you as well? That would be most unusual -- it works fine here. Look carefully at the difference between your code and the one I provided, particularly the init() and start() methods. Since mine is working, there's got to be some important difference. Also, just for debugging consistency, make sure you're using the version of JFreeChart that's provided in the libraries.zip file on the MASON website. Sean