Confluent Cloud Apache Kafka消费者主题[test-1]存在/不存在，missingTopicsFatal为真

Question

在Confluent Cloud上使用Kafka时，在ServiceA将消息发布到主题之后，我在我的消费者（ServiceB）上遇到以下错误。但是，当我登录到我的汇流云时，我看到消息已经成功发布到主题。

 org.springframework.context.ApplicationContextException: Failed to start bean 
'org.springframework.kafka.config.internalKafkaListenerEndpointRegistry'; nested exception is 
 java.lang.IllegalStateException: Topic(s) [topic-1] is/are not present and 
 missingTopicsFatal is true 

当我在本地服务器上运行Kafka时，我不会遇到这个问题。ServiceA能够将消息发布到我的本地Kafka服务器上的主题，ServiceB能够成功地使用该消息。

我在application.properties（注释掉的代码）中提到了我的本地Kafka服务器配置

app.topic=test-1
#Remote
ssl.endpoint.identification.algorithm=https
security.protocol=SASL_SSL
sasl.mechanism=PLAIN
request.timeout.ms=20000
bootstrap.servers=pkc-4kgmg.us-west-2.aws.confluent.cloud:9092
retry.backoff.ms=500
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule
requiredusername="*******"
password="****"

#Local
#ssl.endpoint.identification.algorithm=https
#security.protocol=SASL_SSL
#sasl.mechanism=PLAIN
#request.timeout.ms=20000
#bootstrap.servers=localhost:9092
#retry.backoff.ms=500
#sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule

public class Sender {

@Autowired
private KafkaTemplate<String, String> kafkaTemplate;

@Value("${app.topic}")
private String topic;

public void send(String data){
    Message<String> message = MessageBuilder
            .withPayload(data)
            .setHeader(KafkaHeaders.TOPIC, topic)
            .build();
    kafkaTemplate.send(message);
  }
}

@Configuration
@EnableKafka
public class KafkaProducerConfig {

@Value("${bootstrap.servers}")
private String bootstrapServers;

@Bean
public Map<String, Object> producerConfigs() {
    Map<String, Object> props = new HashMap<>();
    props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
    props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
    return props;
}

@Bean
public ProducerFactory<String, String> producerFactory() {
    return new DefaultKafkaProducerFactory(producerConfigs());
}

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

}

app.topic=test-1
#Remote
ssl.endpoint.identification.algorithm=https
security.protocol=SASL_SSL
sasl.mechanism=PLAIN
request.timeout.ms=20000
bootstrap.servers=pkc-4kgmg.us-west-2.aws.confluent.cloud:9092
retry.backoff.ms=500
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule
requiredusername="*******"
password="****"

#Local
#ssl.endpoint.identification.algorithm=https
#security.protocol=SASL_SSL
#sasl.mechanism=PLAIN
#request.timeout.ms=20000
#bootstrap.servers=localhost:9092
#retry.backoff.ms=500
#sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule

KafkaConsumerConfig.java

@Configuration
@EnableKafka
public class KafkaConsumerConfig {
  @Value("${bootstrap.servers}")
private String bootstrapServers;

@Bean
public Map<String, Object> consumerConfigs() {
    Map<String, Object> props = new HashMap<>();
    props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
    props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.GROUP_ID_CONFIG, "confluent_cli_consumer_040e5c14-0c18-4ae6-a10f-8c3ff69cbc1a"); // confluent cloud consumer group-id
    props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
    return props;
}

@Bean
public ConsumerFactory<String, String> consumerFactory() {
    return new DefaultKafkaConsumerFactory(
            consumerConfigs(),
            new StringDeserializer(), new StringDeserializer());
}

@Bean(name = "kafkaListenerContainerFactory")
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, String> factory =
            new ConcurrentKafkaListenerContainerFactory();
    factory.setConsumerFactory(consumerFactory());
    return factory;
 }
}

KafkaConsumer.java

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

@Value("{app.topic}")
private String kafkaTopic;

  @KafkaListener(topics = "${app.topic}", containerFactory = "kafkaListenerContainerFactory")
  public void receive(@Payload String data) {
    LOG.info("received data='{}'", data);
  }
}

Answer 1

@Cricket_007的答案是正确的。您需要在sasl.jaas.config属性值中嵌入用户名和密码（特别是集群API密钥和API秘密）。

您可以通过下面的官方示例来仔细检查Java客户端应该如何连接到汇流云:https://github.com/confluentinc/examples/blob/5.3.1-post/clients/Cloud/Java/src/main/Java/io/Confluent/examples/clients/Cloud

谢谢,