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.
Is the 'classes' directory in your classpath? If not, the class will not be found. Alternatively, do a "cd WEB-INF/classes" and start the compilation from there; then the class will be in the default classpath.