Where to learn about the java bytecode?

I want to learn the JAVA bytecode. Where to find information about that?

The list of opcodes, list of data types, and how to use them is here:
http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html
I personally use BCEL to manipulate class files.
http://jakarta.apache.org/bcel/
Some report they prefer Soot.
http://www.sable.mcgill.ca/soot/

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