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awesome-annotation-processing
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The documentation could be less sparse. I found the following Awesome Java Annotation Processing. Here's a simplified class diagram to get you started:
As seen above, the API exposes the user to low-level bytecode manipulation via byte arrays. It would be unwieldy to do it directly. Hence, real-life projects rely on bytecode manipulation libraries. ASM has been the traditional library for this, but it seems that Byte Buddy has superseded it. Note that Byte Buddy uses ASM but provides a higher-level abstraction.