dynamically adding urls to classpath

It should be possible to add jars / any urls to the search path (classpath) that JRuby uses when resolving include_class. This would make it possible to write scripts that configure their own search path, making calling them much easier as setting up the CLASSPATH is tedious when a lot of jars are involved. Setting up the search path for ruby code is already possible (the variable $, so adding stuff to java classpath should be possible, too.

This should be pretty easy to implement using a subclass of java.net.URLClassLoader.

Something like this, maybe:

require 'java'
Java.classpath << URL.new('foo.jar') # at least a string, a java.net.URL, java.io.File and Ruby File should be acceptable params