When does the error appear actually?? If it occurs when you enter a URL into the browser, then tell us that URL otherwise if it happens when you submit a form, then please post the code of that form. I think the error appears when you try to list all students as validation happens in that case and since there is no "input" result defined, you get the 404 error message. You'll have to tell struts to skip validation in case of
StudentAction.list() method. You can find more info on how to do that
here...