我正在尝试为我的Kafka使用者编写集成测试.我已经遵循了official reference documentation,但是当我开始测试时,我只会看到这个重复的广告无限：

-2019-04-03 15:47:34.002 WARN 13120 — [ main] org.apache.kafka.clients.NetworkClient : [Consumer
clientId=consumer-1, groupId=my-group] Connection to node -1 could not
be established. Broker may not be available.

我究竟做错了什么？

我正在使用JUnit5,Spring Boot,spring-kafka和spring-kafka-test.

我的@Configuration类上具有@EnableKafka批注.

这是我的测试类的样子：

@ExtendWith(SpringExtension::class)
@SpringBootTest(classes = [TestKafkaConfig::class])
@DirtiesContext
@EmbeddedKafka(
        partitions = 1,
        topics = [KafkaIntegrationTest.MY_TOPIC])
class KafkaIntegrationTest {

    @Autowired
    private lateinit var embeddedKafka: EmbeddedKafkaBroker

    @Test
    fun test() {
        val senderProps = KafkaTestUtils.senderProps(embeddedKafka.brokersAsString)
        val template = KafkaTemplate(DefaultKafkaProducerFactory<Int, String>(senderProps))
        template.defaultTopic = KafkaIntegrationTest.MY_TOPIC
        template.sendDefault("foo")
    }
}

我的application.yml看起来像这样：

kafka:
  consumer:
    group-id: my-group
    bootstrap-servers: ${BOOTSTRAP_SERVERS:localhost:9092}
    value-deserializer: io.confluent.kafka.serializers.KafkaAvroDeserializer
    key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
    properties:
      schema.registry.url: ${SCHEMA_REGISTRY_URL:http://localhost:8081}
      specific.avro.reader: true

我也尝试设置MockSchemaRegistryClient,但得到的消息完全相同. (这是我尝试设置MockSchemaRegistryClient的方式)：

@TestConfiguration
@Import(TestConfig::class)
class TestKafkaConfig {

    @Autowired
    private lateinit var props: KafkaProperties

    @Bean
    fun schemaRegistryClient() = MockSchemaRegistryClient()

    @Bean
    fun kafkaAvroSerializer() = KafkaAvroSerializer(schemaRegistryClient())

    @Bean
    fun kafkaAvroDeserializer() = KafkaAvroDeserializer(schemaRegistryClient(), props.buildConsumerProperties())

    @Bean
    fun producerFactory(): ProducerFactory<*, *> = DefaultKafkaProducerFactory(
            props.buildProducerProperties(),
            StringSerializer(),
            kafkaAvroSerializer())

    @Bean
    fun consumerFactory(): ConsumerFactory<*, *> = DefaultKafkaConsumerFactory(
            props.buildConsumerProperties(),
            StringDeserializer(),
            kafkaAvroDeserializer()
    )

    @Bean
    fun kafkaListenerContainerFactory() = ConcurrentKafkaListenerContainerFactory<Any, Any>().apply {
        setConsumerFactory(consumerFactory() as ConsumerFactory<in Any, in Any>?)
    }

}

我究竟做错了什么？
请注意,我正在使用Confluent Schema Registry,并尝试从Avro反序列化.

我要测试的是我的消费者是否正常工作,如下所示：

open class SomeConsumer(private val someUseCase) {

    @KafkaListener(topics = ["\${kafka.some-topic}"])
    open fun processMessage(record: ConsumerRecord<String, SomeObject>) {
        someUseCase.call(record)
    }
}

解决方法:

我相信您缺少为测试设置代理URL.

在文档中有关于如何获取此值的注释：

When the embedded Kafka and embedded Zookeeper server are started by the EmbeddedKafkaBroker, a system property named spring.embedded.kafka.brokers is set to the address of the Kafka brokers and a system property named spring.embedded.zookeeper.connect is set to the address of Zookeeper. Convenient constants (EmbeddedKafkaBroker.SPRING_EMBEDDED_KAFKA_BROKERS and EmbeddedKafkaBroker.SPRING_EMBEDDED_ZOOKEEPER_CONNECT) are provided for this property.

(位于junit部分here的底部)

解决此问题的一种方法是在测试中将kafka.consumers.bootstrap-servers设置为此值,例如

spring:
    kafka:
        consumer:
            bootstrap-servers: ${spring.embedded.kafka.brokers}