Spring Boot 将 ObjectMapper 注入 Kafka JsonDeserializer

Question

I would like to inject jackson's ObjectMapper into JsonDeserializer for Kafka's ConsumerFactory. I've done what is mentioned on this post:

Inject ObjectMapper into Spring Kafka serialiser/deserialiser

However, when I have multiple @KafkaListener s on different topics, the ConcurrentKafkaListenerContainerFactory constructs multiple instances of ConcurrentMessageListenerContainer using the properties map to initialize the ConsumerFactory instead of the instance passed into ConcurrentKafkaListenerContainerFactory.setConsumerFactory() . Only the first ConcurrentMessageListenerContainer is using the correct ConsumerFactory .

How do I fix this and configure Kafka properly?

Answer 1

You need a different consumer / container factory for each listener. Then use the containerFactory property on @KafkaListener to specify the factory to use.