Java - Force a class implementing an interface to declare an annotation

Question

I'm trying to force class SomeImpl to declare an annotation @SomeAnnotation if it is implementing interface SomeInterface. Solution can modify SomeInterface declaration.

public interface SomeInterface {}

public class SomeImpl implements SomeInterface -> compilation error

@SomeAnnotation
public class SomeInterfaceImpl implements SomeInterface -> compilation ok

Use case: I'm using objects implementing SomeInterface in a method (not written by me, it's an external library) that always read the annotation @SomeAnnotation and it can not be empty or default.

Thanks!

Answer 1

看来这只能使用注释处理器（ https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/Processor.html ）来完成。