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.
It looks to me like this may be an error in your struts-config.xml file. Make sure that the /stockselect action is mapped to a class that exists, has a public no-args constructor, and extends org.apache.struts.action.Action.