Spring Kafka集成测试侦听器不起作用

Question

我正在尝试使用spring-boot和spring嵌入式Kafka进行集成测试。我能够向Spring嵌入式Kafka服务器生成消息，但是服务类中的监听器正在尝试消耗记录和

，而不是测试监听器

KafkaProducerConfigTest 包含所有bean的Config类

@EnableKafka
@TestConfiguration
public class KafkaProducerConfigTest {

@Bean
public EmbeddedKafkaBroker embeddedKafkaBroker() {
    return new EmbeddedKafkaBroker(1,false,2,"test-events");
}

@Bean
public ProducerFactory<String, Object> producerFactory() {
    Map<String, Object> props = new HashMap<>();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, embeddedKafkaBroker().getBrokersAsString());
    props.put(ProducerConfig.RETRIES_CONFIG, 0);
    props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
    return new DefaultKafkaProducerFactory<>(props);
}

@Bean
public KafkaTemplate<String, Object> kafkaTemplate() {
    KafkaTemplate<String, Object> kafkaTemplate = new KafkaTemplate<>(producerFactory());
    return kafkaTemplate;
   }

@Bean("consumerFactory")
 public ConsumerFactory<String, Object> createConsumerFactory() {
     Map<String, Object> props = new HashMap<>();
     props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, embeddedKafkaBroker().getBrokersAsString());
     props.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
     props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
     return new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(), new JsonDeserializer<>(Object.class,false));
 }

@Bean("kafkaListenerContainerFactory")
 public ConcurrentKafkaListenerContainerFactory<String, Object> kafkaListenerContainerFactory() {
     ConcurrentKafkaListenerContainerFactory<String, Object> factory = new ConcurrentKafkaListenerContainerFactory<>();
     factory.setConsumerFactory(createConsumerFactory());
     factory.setBatchListener(true);
     factory.setMessageConverter(new BatchMessagingMessageConverter(converter()));
     factory.getContainerProperties().setAckMode(AckMode.BATCH);
     return factory;
 }

@Bean
public StringJsonMessageConverter converter() {
    return new StringJsonMessageConverter();
}

@Bean
public Listener listener() {
    return new Listener();
}

public class Listener {
    public final CountDownLatch latch = new CountDownLatch(1);

    @Getter
    public List<Professor> list;

    @KafkaListener(topics = "test-events", containerFactory = "kafkaListenerContainerFactory")
    public void listen1(List<Professor> foo) {

        list=foo;
        this.latch.countDown();
      }
   }

 }

KafkaProducerServiceTest 服务测试类，但这里的侦听器未使用任何数据，我知道此测试将失败，因为这是不正确的方法

@EnableKafka
@SpringBootTest(classes = { KafkaProducerConfigTest.class })
@RunWith(SpringRunner.class)
public class KafkaProducerServiceTest {

@Autowired
private KafkaConsumerService kafkaConsumerService;

@Autowired
private Listener listener;

@Test
public void testReceive() throws Exception {
    kafkaConsumerService.professor(Arrays.asList(new Professor("Ajay", new Department("social", 1234))));
    System.out.println("The professor object is sent to kafka -----------------------------------");
    listener.latch.await();
    System.out.println(listener.getList());

    }

}

错误

2019-02-19 15:18:32.620 ERROR 22387 --- [ntainer#1-0-C-1] o.s.k.listener.BatchLoggingErrorHandler  : Error while processing:
ConsumerRecord(topic = test-events, partition = 1, offset = 0, CreateTime = 1550611112583, serialized key size = 9, serialized value size = 64, headers = RecordHeaders(headers = [], isReadOnly = false), key = professor, value = {name=Ajay, department={deptName=social, deptId=1234}})

 java.lang.IllegalStateException: Only String or byte[] supported
at org.springframework.kafka.support.converter.StringJsonMessageConverter.extractAndConvertValue(StringJsonMessageConverter.java:140) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.support.converter.MessagingMessageConverter.toMessage(MessagingMessageConverter.java:134) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.support.converter.BatchMessagingMessageConverter.convert(BatchMessagingMessageConverter.java:217) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.support.converter.BatchMessagingMessageConverter.toMessage(BatchMessagingMessageConverter.java:165) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.toMessagingMessage(BatchMessagingMessageListenerAdapter.java:174) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.onMessage(BatchMessagingMessageListenerAdapter.java:129) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.onMessage(BatchMessagingMessageListenerAdapter.java:59) ~[spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeBatchListener(KafkaMessageListenerContainer.java:984) [spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeBatchListener(KafkaMessageListenerContainer.java:917) [spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:900) [spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:753) [spring-kafka-2.2.0.RELEASE.jar:2.2.0.RELEASE]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_191]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_191]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]

根据@Gray Russel先生的回答进行了更新，但是我仍然有问题

Answer 1

在容器工厂中使用StringDeserializer和StringJsonMessageConverter（或BytesDeserializer和BytesJsonMessageConverter）；然后，框架可以根据方法签名确定目标类型，并将其传递给转换器。

解串器离堆栈太远了，无法进行推断。

Answer 2

对此讨论做出回应可能为时已晚。 正如@Gary Russell在他的答复中提到的那样，只需使用StringDeserializer对对象进行反序列化。

application.yml以配置Kafka：

server:
 port: 8080
 servlet:
   contextPath: /poi
spring:
   kafka:
consumer:
  bootstrap-servers: localhost:9092
  group-id: rsvp-consumers
  auto-offset-reset: earliest
  key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
  value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
  properties:
    spring:
      json:
        type:
          mapping: poi:org.ajeet.learnings.spring.springboot.model.POI
producer:
  bootstrap-servers: localhost:9092
  key-serializer: org.apache.kafka.common.serialization.StringSerializer
  value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
  properties:
    spring:
      json:
        type:
          mapping: poi:org.ajeet.learnings.spring.springboot.model.POI
topics: spatial

Kafka事件类别：

public final class POI {
private final double longitude;
private final double latitude;
private final POI_Type type;
private final String description;

@JsonCreator
public POI(@JsonProperty("longitude") double longitude,
           @JsonProperty("latitude") double latitude,
           @JsonProperty("type") POI_Type type,
           @JsonProperty("description") String description) {
    this.longitude = longitude;
    this.latitude = latitude;
    this.type = type;
    this.description = description;
}
public double getLongitude() {
    return longitude;
}
public double getLatitude() {
    return latitude;
}
public String getDescription() {
    return description;
}}

在您的 application 类寄存器 StringJsonMessageConverter 中（您也可以在其他地方创建该bean），这会将字符串转换为必需的对象，即POI：

@SpringBootApplication
@ComponentScan("org.ajeet.learnings.spring")
public class SpringBootKafkaApplication {

public static void main(String[] args) {
    SpringApplication.run(SpringBootKafkaApplication.class, args);
}
/**
 * We are using a StringDeserializer in kafka consumer properties
 *  And this converter is converting the message from string to required type.
 *
 * @return RecordMessageConverter
 */
@Bean
public RecordMessageConverter converter() {
    return new StringJsonMessageConverter();
}}

这是消费者：

@Service
public final class POIEventConsumer {
private final Logger LOG = LoggerFactory.getLogger(POIEventConsumer.class);

/**
 * Read topic names from application.yaml
 *
 * @param pointOfInterest
 * @throws IOException
 */
@KafkaListener(topics = "#{'${spring.kafka.topics}'.split(',')}")
public void consume(POI pointOfInterest) throws IOException {
    LOG.info(pointOfInterest.toString());
} }

这是生产者：

@Service
public class POIEventProducer {
private static final Logger LOG = LoggerFactory.getLogger(POIEventProducer.class);

@Value("${spring.kafka.topics}")
private String topic;

@Autowired
private KafkaTemplate<String, POI> kafkaTemplate;

public void sendMessage(POI pointOfInterest) {
    this.kafkaTemplate.send(topic, pointOfInterest);
}}

您可以使用控制器对其进行测试：

@RestController
@RequestMapping(value = "/kafka")
public final class POIEventController {
private final Logger LOG = LoggerFactory.getLogger(POIEventController.class);

@Autowired
private POIEventProducer poiEventProducer;


/**
 * Post request url: http://localhost:8080/poi/kafka/publish
 * Example of request body: {"longitude":77.100281, "latitude": 28.556160, "type": "Airport", "description": "Indira Gandhi International Airport New Delhi"}
 *
 * @param pointOfInterest
 */
@RequestMapping(value = "/publish",
        method = RequestMethod.POST,
        consumes = MediaType.APPLICATION_JSON_VALUE)
public void sendMessageToKafkaTopic(@RequestBody POI pointOfInterest) {
    this.poiEventProducer.sendMessage(pointOfInterest);
}}