protected Byte[] deserializeFromBase64(JsonParser jp, DeserializationContext ctxt)
     throws IOException, JsonProcessingException {
   // First same as what ArrayDeserializers.ByteDeser does:
   byte[] b = jp.getBinaryValue(ctxt.getBase64Variant());
   // But then need to convert to wrappers
   Byte[] result = new Byte[b.length];
   for (int i = 0, len = b.length; i < len; ++i) {
     result[i] = Byte.valueOf(b[i]);
   }
   return result;
 }