Inject ObjectMapper into Spring Kafka serialiser/deserialiser

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;
    }