core/src/main/java/org/springframework/security/access/method/MapBasedMethodSecurityMetadataSource.java
@Override
	protected Collection<ConfigAttribute> findAttributes(Method method,
			Class<?> targetClass) {
		if (targetClass == null) {
			return null;
		}

		return findAttributesSpecifiedAgainst(method, targetClass);
	}
@Override
	protected Collection<ConfigAttribute> findAttributes(Method method,
			Class<?> targetClass) {
		if (targetClass == null) {
			return null;
		}

		return findAttributesSpecifiedAgainst(method, targetClass);
	}
Will walk the method inheritance tree to find the most specific declaration
applicable.