1. Create a directory structure outside JDKs dir structure, as JDKs dir structure has a certain format and the JVM reads it for certain reasons (like bootstrap and java extensions classloading etc)
(FYR-Take a look at:
http://java.sun.com/docs/books/tutorial/ext/basics/load.html)

2. Include the parent dir. of your package in the classpath, for example if you have your class that follows the package structure as myjava.util.MyC lass...