java classloader

http://www.chariotsolutions.com/slides/roadshow-classloading.ppt

contextClassLoader is not used for class loading explicilty.
You can ask for it through Thread.getContextClassLoader() and
then use the class loader as the parent class loader of URLClassLoader
and ask for loading a class.
The contextClassLoader is initialized with sun default class loader
sun.misc.Launcher$AppClassLoade