This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
That's not an 'error' - it's just displaying the HTTP response code rather than the content on that page - not sure why it would be doing that without more details on the configuration / mappings / controllers you're using though.
Write once, run anywhere, because there's nowhere to hide! - /. A.C.