This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
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In general if classpath has been setup correctly the error should not occur. However, make sure that your classpath includes .; i.e. path to your current folder where the program is located. If not, the above error will show up and this may be all you need to fix your problem.