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.
getRemoteAddr() and getRemoteHost() really should work - to an extent... These calls will return the IP/host of the client, or the last proxy before they hit the web page. Is it possible that there's something that could act as a "proxy" on your server before the client hits the web page?
Write once, run anywhere, because there's nowhere to hide! - /. A.C.