"Professional Java Server Programming J2EE Edition" (page 88-89) identifies two options for HTTP tunneling. One option is to use java-rmi.cgi script which (apparently) is a big security loophole in the server. Are there security problems using servlets as illustrated in Jason Hunter's "Java servlet Programming"? If not, why does he not demo them on his site? You can run all the other examples except is RMI chat program (last I checked a couple of months ago).