Kafka 给出：“在实际进入消费者组之前，组成员需要有一个有效的成员 ID”

Question

新手上路，请多包涵

我正在使用 Kafka 在 Java 中使用消息。我想通过在我的本地盒子上多次启动同一个应用程序来进行测试。当我启动时，我第一次能够开始使用主题中的消息。当我启动第二个时，我得到：

 Join group failed with org.apache.kafka.common.errors.MemberIdRequiredException: The group member needs to have a valid member id before actually entering a consumer group

并且不会从主题中收到任何消息。如果我尝试启动更多它们，我会遇到同样的问题。

我为 Kafka 使用的配置是

spring:
  kafka:
    bootstrap-servers: kafka:9092
    consumer:
      auto-offset-reset: earliest
      key-deserializer: org.springframework.kafka.support.serializer.ErrorHandlingDeserializer2
      value-deserializer: org.springframework.kafka.support.serializer.ErrorHandlingDeserializer2
      properties:
        spring.deserializer.key.delegate.class: org.springframework.kafka.support.serializer.JsonDeserializer
        spring.deserializer.value.delegate.class: org.springframework.kafka.support.serializer.JsonDeserializer
        spring.json.use.type.headers: false
    listener:
      missing-topics-fatal: false

我有两个话题

@Configuration
public class KafkaTopics {
    @Bean("alertsTopic")
    public NewTopic alertsTopic() {

        return TopicBuilder.name("XXX.alerts")
            .compact()
            .build();
    }

    @Bean("serversTopic")
    public NewTopic serversTopic() {

        return TopicBuilder.name("XXX.servers")
            .compact()
            .build();
    }

}

以及不同类文件中的两个侦听器。

 @KafkaListener(topics = SERVERS_KAFKA_TOPIC, id = "#{T(java.util.UUID).randomUUID().toString()}",
    properties = {
        "spring.json.key.default.type=java.lang.String",
        "spring.json.value.default.type=com.devhaus.learningjungle.db.kafka.ServerInfo"
    })
public void registerServer(
    @Payload(required = false) ServerInfo serverInfo
)

@KafkaListener(topics = ALERTS_KAFKA_TOPIC,
    id = "#{T(java.util.UUID).randomUUID().toString()}",
    properties = {
        "spring.json.key.default.type=com.devhaus.learningjungle.db.kafka.AlertOnKafkaKey",
        "spring.json.value.default.type=com.devhaus.learningjungle.db.kafka.AlertOnKafka"
    })
public void processAlert(
    @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) AlertOnKafkaKey key,
    @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partitionId,
    @Header(KafkaHeaders.OFFSET) long offset,
    @Payload(required = false) AlertOnKafka alert)