Embedded headers found in Spring Cloud Stream message body

Question

I use Spring Cloud Stream 1.3.2.RELEASE to publish a String message to Kafka. When I consume the message using command line Kafka consumer or Spring Kafka @KafkaListener, a contentType header is always appended to the message body.

Question:

Is there any way to get rid of the embedded headers?

--

Spring Cloud Stream as producer

private void send() {
    channel.test().send(MessageBuilder.withPayload("{\"foo\":\"bar\"}").build());
}

Command line Kafka consumer

$ bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test
�
 contentType
            "text/plain"{"foo":"bar"}

Spring Kafka as consumer

@KafkaListener(topics = "test")
public void receive(Message message){
    log.info("Message payload received: {}", message.getPayload());
}

2018-05-16 07:12:05.241  INFO 19475 --- [ntainer#0-0-C-1] com.demo.service.Listener  : Message payload received: �contentType"text/plain"{"foo":"bar"}

@KafkaListener(topics = "test")
public void receive(@Payload String message){
    log.info("Message payload received: {}", message);
}

2018-05-16 07:16:14.313  INFO 19747 --- [ntainer#0-0-C-1] com.demo.service.Listener  : Message payload received: �contentType"text/plain"{"foo":"bar"}

Artem Bilan Artem Bilan · Accepted Answer · 2018-05-15T23:43:12

See headerMode binding property: https://docs.spring.io/spring-cloud-stream/docs/Ditmars.SR3/reference/htmlsingle/#_properties_for_use_of_spring_cloud_stream. You need to set it to raw for the destination you send messages.

Embedded headers found in Spring Cloud Stream message body

1 Answers