This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
My work is under win2000 and I use windows notepad to edit my .txt document, so is my documnet "Plain text"?? Yes. Can I use JBuilder to build .jar file?? Yes, but make sure that your submission doesn't depend on any JBuilder/Borland classes. The best way to ensure it is to run your program on a machine that doesn't have JBuilder installed.