code: public static boolean isInJavaLangAnnotationPackage(Annotation annotation) {
  		Assert.notNull(annotation, "Annotation must not be null");
  		return annotation.annotationType().getName().startsWith("java.lang.annotation");
  	}
docs: Determine if the supplied {@link Annotation} is defined in the core JDK
  {@code java.lang.annotation} package.
  @param annotation the annotation to check (never {@code null})
  @return {@code true} if the annotation is in the {@code java.lang.annotation} package