How do I remove the header in a Kafka (Spring-boot)?

Question

I need to send a message to a specific Kafka topic. I use the following KafkaTemplate to do this: KafkaTemplate<String, RequestDto>

The following parameters are put in the Kafka producer:

private ProducerFactory<String, RequestDto> producerConfigs() {
    Map<String, Object> props = new HashMap<>();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, kafkaServer);
    props.put(ProducerConfig.CLIENT_ID_CONFIG, clientId);
    props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
    return new DefaultKafkaProducerFactory<>(props);
}

Creating a Producer:

    public KafkaTemplate<String, RequestDto> kafkaTemplate() {
        KafkaTemplate<String, RequestDto> template = new KafkaTemplate<>(producerConfigs());
        template.setMessageConverter(new StringJsonMessageConverter());
        return template;
    }

And when I execute the "send" method, I have a message sent to the Kafka topic, but at the same time I send the header, which contains the path to the DTO file of the request.

ListenableFuture<SendResult<String, RequestDto>> result = kafkaTemplate.send(topic, requestDto);

Example header in offset explorer

Because of this header something breaks in the application, which is a consumer and I can't do anything about it. Is there any way to remove this header from the query?

Answer 1

You can create DefaultKafkaProducerFactory by adding JsonSerializer with ADD_TYPE_INFO_HEADERS false

JsonSerializer jsonSerializer = new JsonSerializer();
jsonSerializer.setAddTypeInfo​(false);  //  

Set to false to disable adding type info headers.

And then create DefaultKafkaProducerFactory with key and value serializer

return new DefaultKafkaProducerFactory<>(props,new StringSerializer(),jsonSerializer);

You can also disable this properties through producer side by Configuration Properties

JsonSerializer.ADD_TYPE_INFO_HEADERS (default true): You can set it to false to disable this feature on the JsonSerializer (sets the addTypeInfo property).

And to ignore during consumer side

JsonDeserializer.USE_TYPE_INFO_HEADERS (default true): You can set it to false to ignore headers set by the serializer.