@Override
    public com.google.protobuf.ByteString
        getIdBytes() {
      Object ref = id_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8(
                (String) ref);
        id_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<code>string id = 2;</code>
@return The bytes for id.
core/src/test/java/com/alibaba/fastjson2/dubbo/GoogleProtobufBasic.java