alue) {         if (nestedMessageBuilder_ == null) {           nestedMessage_ = builderForValue.build();           onChanged();         } else {           nestedMessageBuilder_.setMessage(builderForValue.build());         }          return this;       }       /**        * <code>.io.confluent.kafka.serializers.protobuf.test.NestedMessage nested_message = 0;</code>        */       public Builder mergeNestedMessage(io.confluent.kafka.serializers.protobuf.test.NestedTestProto.NestedMessage value) {         if (nestedMessageBuilder_ == null) {           if (nestedMessage_ != null) {             