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.
If Struts can't match up the action path specified in the <html:form> tag to an action in the config file, it won't be able to find and instantiate the proper ActionForm bean. Sometimes it will find it even with the ".do" at the end, but I've found it's best to specify the action in the <html:form> exactly as it's defined in the struts-config.xml file.