Java bytecode fundamentals

Having never touched Jave bytecode. I have to say I was pretty thrown off. Perhaps I need a "Java bytecode fundamentals" fundamentals.

Well, it says nothing more then the original article by Peter Haggar, does it?<p><a href="http://www.ibm.com/developerworks/ibm/library/it-haggar_bytecode/" rel="nofollow">http://www.ibm.com/developerworks/ibm/library/it-haggar_byte...</a>