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What legitimate uses are there for bytecode manipulation and how people implement those bytecode manipulation based solutions in practice?
Update: I should have made it more clear that this question really is about what patterns and techniques people use to make their code fly with the help of bytecode manipulation.
Something like aspect oriented programming that was already mentioned or building proxy objects on the fly and similar techniques.
Bytecode manipulation lets you implement arbitrarily complex (and interesting) program transformations, such as:
The scope is endless; this is just a small sampling.
As for how this is typically done, start here.