try {
        Class<?> clazz = Class.forName("java.util.zip.Checksum");
        return MethodHandles.lookup()
            .findVirtual(clazz, "update", MethodType.methodType(void.class, ByteBuffer.class));
      } catch (ClassNotFoundException e) {
        throw new AssertionError(e);
      } catch (IllegalAccessException e) {
        // That API is public.