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(0) Ask yourself whether you even need to ask a question. Did you: (a) look through the Javadocs? (b) search the forum to see if a similar question has already been asked and answered? (c) search the web (via your search engine of choice)? Heck, you might even want to look through the JFreeChart source code - it's not just for the compiler to look at.
(1) DON'T tell us your problem is URGENT. Your deadlines, priorities and lack of resources are of no concern to us. We have our own deadlines, priorities and lack of resources to deal with. See also point (2). And if you haven't read the JFreeChart Javadocs, searched the forum and searched the web, then DO NOT CONTINUE. Go right back to step (0) and start again.
(2) Remember that questions are answered by volunteers, not by paid support engineers. If no-one answers your question, it could be just that no-one has any spare time right now. Or it could be that you didn't ask your question the RIGHT WAY.
(3) If you think you didn't ask your question the right way, add some more information in a follow-up post. But DON'T start a new thread, just post the additional info on the same thread.
(4) Choose a short but descriptive title for your post. A post entitled "Help me please!!!" is less likely to attract someone's attention than "XYBarRenderer bug(?) in version 1.0.9".
(5) State the version number of JFreeChart that you are using and, if you think it might be relevant, the operating system and JRE version you are using. This information is important and, having got our attention with your question, you don't want to lose it again while we wait for you to tell us what version of JFreeChart you are using.
(6) It is always a good idea to include a screen-shot in your post. A picture really is worth a thousand words, especially since we're talking about charts.
(7) If you are reporting something that you think is a bug, include a small, SELF-CONTAINED demo program that shows the problem. Better still, write a JUnit test and post that. If your code can't be compiled outside of your environment, it is almost worthless to us.
http://www.jfree.org/phpBB2/viewtopic.php?t=24713
Get the idea?