How to extend Java annotation?

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As piotrek pointed out, you cannot extend Annotations in the sense of inheritance. Still, you can create Annotations that aggregate others:

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface SuperAnnotation {
    String value();
}

@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface SubAnnotation {
    SuperAnnotation superAnnotation();
    String subValue();
}

Usage:

@SubAnnotation(subValue = "...", superAnnotation = @SuperAnnotation(value = "superValue"))
class someClass { ... }

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