The Wikibook

Java Programming

has a page on the topic of:

Java bytecode

• Oracle's Java Virtual Machine Specification

• Programming Languages for the Java Virtual Machine

• Bytecode Visualizer – bytecode viewer and debugger (free Eclipse

plugin)

• AdaptJ StackTrace – bytecode level debugging with a full control of

the stack, the local variables, and the execution flow

• Java Class Unpacker – plugin for Total Commander, it lets open class

files as compressed archives and see fields and methods as files. The

bytecode can be viewed as text using F3