java - Inject ObjectMapper into Spring Kafka serialiser/deserialiser

Question

I'm using Spring Kafka 1.1.2-RELEASE with Spring Boot 1.5.0 RC and I have configured a custom value serialiser/deserialiser class extending org.springframework.kafka.support.serializer.JsonSerializer/org.springframework.kafka.support.serializer.JsonDeserializer. These classes do use a Jackson ObjectMapper which can be provided through the constructor.

Is it somehow possible to inject the ObjectMapper from my Spring context? I have an ObjectMapper configured already which I would like to reuse in the serialiser/deserialiser.

Answer 1

You can configure JsonSerializer and JsonDeserializer as @Beans. Inject a desired ObjectMapper to them. And use those beans in the DefaultKafkaProducerFactory and DefaultKafkaConsumerFactory bean definitions:

    @Bean
    public ProducerFactory<Integer, String> producerFactory() {
        DefaultKafkaProducerFactory<Integer, String> producerFactory = 
                new DefaultKafkaProducerFactory<>(producerConfigs());
        producerFactory.setValueSerializer(jsonSerializer());
        return producerFactory;
    }