In an effort to help you get the most from our forums, we've compiled a list of tips for asking questions here. You can find the list in our FAQ section here. In particular, please see TellTheDetails
Some useful details, in this case, would be, the name of your application, the URL you're using when making a request to the application. How did you deploy your application (war file, directory structure)?
It's very hard for anyone on a list to help you if we have no idea what you're doing.
Again, welcome to JavaRanch and good luck with your question. -Ben