This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
Please TellTheDetails You cannot "create a servlet class file" You create a java file, compile it and the compiler generates the class files.
Tell us exactly what you were doing when you got this error. Also post the full stack trace.