'Spring missing field when usingprotobuf JsonFormat.printer

I will made JsonSerializer

public class ProtobufSerializer extends JsonSerializer<Message> {
        private final JsonFormat.Printer printer = JsonFormat.printer().preservingProtoFieldNames();

        @Override
        public void serialize(Message protoMessage, JsonGenerator jsonGenerator, SerializerProvider serializerProvider)
                throws IOException {
            String print = printer.print(protoMessage);
            jsonGenerator.writeRawValue(print);
        }
    }

when i get protoMessage value like it this enter image description here

{
result_ = true
code_ = 0
message_ = ""
}

but code and message field is missing after this method

String print = printer.print(protoMessage);

how can i prevent missing field?

javaspringserializationprotocol-buffers


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