It's Apache 2.2.8.
My original thinking was that if I could get Glassfish listening on port 80 a specific IP, then I needn't involve Apache at all, but if you think mod_proxy would be the easiest way to go, then I'll follow your advice.
I've just managed to persuade Apache not to listen on all the available IPs, so I have one free for Glassfish's use.
[Message sent by forum member 'angusm' (angusm)]
http://forums.java.net/jive/thread.jspa?messageID=287533