I'm clueless about Java [the real problem] and the setup didn't work quite as mentioned on KH's site.
He's got a link for the required Java software: [JRE1.1.8]
http://java.sun.com/products/jdk/1.1/jre/index.html

but what you really need is:[Java2RE]
http://java.sun.com/j2se/

After installing the first [JRE118], the 'java -jar phex.jar' command was not recognized. After getting Java2E into place everything was gravy!

PS: Phrex kicks Limewire's butt.