using source?

hello
i am doing a final year Computer Science project in the development of gnutella p2p and was hoping to use your source code and try write my own advancements. I am used to using jbuilder for java projects but can't get the package com.sun.java.util.* for it which means i can't compile the code. How do i do this? (i know i can run it by downloading the sun thing it says to in the readme file but want to be able to mess with the code using jbuilder)....

That package should be in the collections.jar file that is distributed with LimeWire. Try adding it to your classpath. The project is designed to be built with ant, which is available from http://jakarta.apache.org/ant/index.html