This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Amolpalekar, When do you get the error? If it is when the struts file is loaded, check that you form class extends ActionForm. If it is when the action is executed, try printing out the stack trace to see where the exception is being thrown.