Spring Integration Kafka Consumer Listener 不接收消息

Question

根据here 提供的文档，我正在尝试使用 POC 将消息发送到same documentation 中提到的侦听器，以下是我编写配置的方式。

@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);
    }

}

监听器如下，

@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();
    }

}

即使我正在为同一主题生成消息并且此使用者正在处理同一主题，但侦听器并未执行。

我正在运行 Kafka 0.10.0.1，这是我当前的 pom。与许多命令行示例不同，此使用者作为 Spring Boot Web 应用程序工作。

   <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>

我花了很多时间来弄清楚为什么当主题有消息时这个监听器没有被命中，我做错了什么。

我知道我可以使用通道接收消息（我已经在代码中注释掉了配置部分），但是这里的并发处理是干净的。

这种实现是否可以通过异步消息消费实现。

Answer 1

您必须在@Configuration 旁边添加@EnableKafka。

很快会add一些描述。

同时：

@Configuration
@EnableKafka
public class KafkaConsumerConfig {