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.
I'm using Eclipse to export a jar file of three classes. I specified that the main class was the one with the main method in it, but when I double click the file it says "Could not find the main class. Program will exit." Is there anything else I need to do to get .jars to work?