Spring Integration Kafka Consumer Listener not Receiving messages

Question

According to the documentation provided here, I am trying on a POC to get messages into a listener as mentioned in the the same documentation, Below is how I have written the configuration.

@Configuration
public class KafkaConsumerConfig {

    public static final String TEST_TOPIC_ID = "record-stream";

    @Value("${kafka.topic:" + TEST_TOPIC_ID + "}")
    private String topic;

    @Value("${kafka.address:localhost:9092}")
    private String brokerAddress;


    /*
      @Bean public KafkaMessageDrivenChannelAdapter<String, String> adapter(
      KafkaMessageListenerContainer<String, String> container) {
      KafkaMessageDrivenChannelAdapter<String, String>
      kafkaMessageDrivenChannelAdapter = new
      KafkaMessageDrivenChannelAdapter<>( container, ListenerMode.record);
      kafkaMessageDrivenChannelAdapter.setOutputChannel(received()); return
      kafkaMessageDrivenChannelAdapter; }

      @Bean public QueueChannel received() { return new QueueChannel(); }
     */

    @Bean
    public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> kafkaListenerContainerFactory() {

        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory());
        factory.setConcurrency(3);
        factory.getContainerProperties().setPollTimeout(30000);
        return factory;

    }

    /*
     * @Bean public KafkaMessageListenerContainer<String, String> container()
     * throws Exception { ContainerProperties properties = new
     * ContainerProperties(this.topic); // set more properties return new
     * KafkaMessageListenerContainer<>(consumerFactory(), properties); }
     */

    @Bean
    public ConsumerFactory<String, String> consumerFactory() {
        Map<String, Object> props = new HashMap<>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, this.brokerAddress);
        // props.put(ConsumerConfig.GROUP_ID_CONFIG, "mygroup");
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest"); // earliest
                                                                        // smallest
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "100");
        props.put(ConsumerConfig.SESSION_TIMEOUT_MS_CONFIG, "15000");
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        return new DefaultKafkaConsumerFactory<>(props);
    }

}

and Listener is as below,

@Service
public class Listener {

    private Logger log = Logger.getLogger(Listener.class);


    @KafkaListener(topicPattern = KafkaConsumerConfig.TEST_TOPIC_ID, containerFactory = "kafkaListenerContainerFactory")
    public void process(String message/* , Acknowledgment ack */) {
        Gson gson = new Gson();
        Record record = gson.fromJson(message, Record.class);

        log.info(record.getId() + " " + record.getName());
        // ack.acknowledge();
    }

}

Even though I am producing messages to the same topic and this consumer is working on the same topic, Listener is not executing.

I am running Kafka 0.10.0.1, and here is my current pom. This consumer is working as a spring boot web application unlike many command line samples.

   <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>

        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-kafka</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-java-dsl</artifactId>

        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

I have spent a good amount of time to figure out why this listener is not getting hit when the topic has messages, what is it I am doing wrong.

I know that I can receive the messages using a channel (I have commented configuration part of that out in the code), But here the concurrency is handle clean.

Is this kind of implementation is possible with a async message consumption.

Answer 1

You have to add @EnableKafka alongside with the @Configuration.

Will add some description soon.

Meanwhile:

@Configuration
@EnableKafka
public class KafkaConsumerConfig {