This week's book giveaway is in the Java in General forum. We're giving away four copies of Think Java: How to Think Like a Computer Scientist and have Allen B. Downey & Chris Mayfield 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.