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Are Java annotations used for adding functionality to Java code besides just adding documentation about what’s going on in the code? What’s the most advanced/complex functionality you could add to your code through an annotation?
Annotation are basically not more than a tag (with optional additional data) on a class/method/field. Other code (libraries or tools) can discover these tags and execute functionality dependant on the annotations found. I don’t see a real limit on the complexity of the functionality possibly added by annotations. This can for example emulate AOP (adding functionality before or after a method with an annotation).