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Use a Custom MessageConverter in the Consumer

Pragya Keshap answered on February 11, 2023 Popularity 1/10 Helpfulness 1/10

answer Use a Custom MessageConverter in the Consumer

Use a Custom MessageConverter in the Consumer

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To be able to deserialize the incoming message, we'll need to provide our Consumer with a custom MessageConverter.

typeMapper.setTypePrecedence(Jackson2JavaTypeMapper.TypePrecedence.TYPE_ID);
Map<String, Class<?>> mappings = new HashMap<>(); 
mappings.put("greeting", Greeting.class);
mappings.put("farewell", Farewell.class);
typeMapper.setIdClassMapping(mappings);
typeMapper.addTrustedPackages("com.baeldung.spring.kafka");
@Bean
public RecordMessageConverter multiTypeConverter() {
    StringJsonMessageConverter converter = new StringJsonMessageConverter();
    DefaultJackson2JavaTypeMapper typeMapper = new DefaultJackson2JavaTypeMapper();
    typeMapper.setTypePrecedence(Jackson2JavaTypeMapper.TypePrecedence.TYPE_ID);
    typeMapper.addTrustedPackages("com.baeldung.spring.kafka");
    Map<String, Class<?>> mappings = new HashMap<>();
    mappings.put("greeting", Greeting.class);
    mappings.put("farewell", Farewell.class);
    typeMapper.setIdClassMapping(mappings);
    converter.setTypeMapper(typeMapper);
    return converter;
}
@Bean
public ConsumerFactory<String, Object> multiTypeConsumerFactory() {
    HashMap<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
    return new DefaultKafkaConsumerFactory<>(props);
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, Object> multiTypeKafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConsumerFactory(multiTypeConsumerFactory());
    factory.setMessageConverter(multiTypeConverter());
    return factory;
}

https://www.baeldung.com/spring-kafka#4-adding-message-filter-for-listeners

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: consumer java

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Contributed on Feb 11 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Use a Custom MessageConverter in the Consumer

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