I have 2 spring boot applications. I am trying to map in the application.properties file in such way that the Consumer can receive the message send by the producer. I want to add that I am using a CustomMessage:
public class CustomMessage {
private LocalDateTime timestamp;
private Integer sensor_id;
private Double measurement_value;
// getters and setters
}
My application.properties file for the producer:
# other properties ( I use CloudKarafka )
spring.kafka.producer.key-serializer= org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer= org.springframework.kafka.support.serializer.JsonSerializer
spring.kafka.producer.properties.spring.json.type.mapping=customMessage:assignment2.kafka.CustomMessage,customMessage:ro.tuc.ds2020.kafkaconsumer.CustomMessage
And for consumer:
spring.kafka.consumer.key-deserializer= org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer= org.springframework.kafka.support.serializer.JsonDeserializer
spring.kafka.consumer.properties.spring.json.type.mapping=customMessage:ro.tuc.ds2020.kafkaconsumer.CustomMessage, customMessage:assignment.kafka.CustomMessage
I am not sure how the type.mapping should be done. Doing in this way presented, I get the following error:
Failed to construct kafka consumer
Failed to load: assignment.kafka.CustomMessage for customMessage
It is also failing to construct producer.
CodePudding user response:
The map is from a class to a token (producer side) and token to class (consumer side).
You are mapping 2 different types to the same token.
Producer:
customMessage:assignment2.kafka.CustomMessage,
customMessage:ro.tuc.ds2020.kafkaconsumer.CustomMessage
Consumer:
customMessage:ro.tuc.ds2020.kafkaconsumer.CustomMessage,
customMessage:assignment.kafka.CustomMessage
Assuming the producer's class is assignment2.kafka.CustomMessage
you just need
customMessage:assignment2.kafka.CustomMessage
on the producer side and
customMessage:ro.tuc.ds2020.kafkaconsumer.CustomMessage
on the consumer side.