我正在尝试运行一个简单的Spring Boot Kafka应用程序,但无法正常运行。我遵循了各种教程,现在我正在实现this one,但是当我启动应用程序时,会发生以下情况:
我可以在控制台中写东西,但是使用者没有收到任何消息。
这是我的SpringApplication类:
@SpringBootApplication(scanBasePackages = "com.springmiddleware")
@ComponentScan("com.springmiddleware")
@EnableAutoConfiguration
@EntityScan("com.springmiddleware")
public class SpringMiddlewareApplication implements CommandLineRunner{
public static void main(String[] args) throws Exception {
SpringApplication.run(SpringMiddlewareApplication.class, args);
}
@Autowired
private Producer sender;
@Override
public void run (String... strings) {
sender.send("Hello world");
}
}
application.yml:
spring:
kafka:
bootstrap-servers: localhost:8080
app:
topic:
foo: foo.t
logging:
level:
root: ERROR
org.springframework.web: ERROR
com.memorynotfound: DEBUG
消费类,生产者类及其配置的类与本教程中编写的相同。
在我的server.properties文件中:
zookeeper.connect=localhost:8080
和zookeeper.properties中的
:clientPort=8080
application.yml中指定的相同端口。在启动应用程序之前,我运行
.\bin\windows\zookeeper-server-start.bat config\zookeeper.properties
和
.\bin\windows\kafka-server-start.bat config\server.properties
更新
这是ReceiverConfig
类:
@EnableKafka
@Configuration
public class ReceiverConfig {
@Value("${spring.kafka.bootstrap-servers}")
private String bootstrapServers;
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "foo");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
return props;
}
@Bean
public ConsumerFactory<String, String> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs());
}
@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
这是SenderConfig类:
@Configuration
public class SenderConfig {
@Value("${spring.kafka.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());
}
}
这是Consumer类中的方法listen
@KafkaListener(topics = "${app.topic.foo}")
public void listen(@Payload String message) {
System.out.println("Received " + message);
}
生产者类别:
@Service
public class Producer {
@Autowired
private KafkaTemplate<String, String> kafkaTemplate;
@Value("${app.topic.foo}")
private String topic;
public void send(String message){
kafkaTemplate.send(topic, message);
}
}
更新2
[2019-04-01 17:23:52,492] INFO为客户端/ 0:0:0:0:0:0:0:1:60079(org.apache.zookeeper。)建立会话0x100435950880000,协商超时6000 server.ZooKeeperServer) [2019-04-01 17:23:52,539]信息在处理sessionid:0x100435950880000 type:create cxid:0x1 zxid:0xef txntype:-1 reqpath:n / a错误路径:/消费者错误:KeeperErrorCode =适用于/ consumers的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,555]信息处理sessionid:0x100435950880000 type:create cxid:0x2 zxid:0xf0 txntype:-1 reqpath:n / a错误路径:/ brokers / ids错误时,出现用户级KeeperException KeeperErrorCode =用于/ brokers / ids的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,555]信息处理sessionid:0x100435950880000 type:create cxid:0x3 zxid:0xf1 txntype:-1 reqpath:n / a错误路径:/ brokers / topics错误时,出现了用户级KeeperException KeeperErrorCode =用于/ brokers / topics的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,555]信息在处理sessionid:0x100435950880000 type:create cxid:0x4 zxid:0xf2 txntype:-1 reqpath:n / a错误路径:/ config / changes错误时,出现用户级KeeperException KeeperErrorCode =用于/ config / changes的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,570]信息处理sessionid:0x100435950880000 type:create cxid:0x5 zxid:0xf3 txntype:-1 reqpath:n / a错误路径:/ admin / delete_topics错误: KeeperErrorCode =用于/ admin / delete_topics的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,570]信息在处理sessionid:0x100435950880000 type:create cxid:0x6 zxid:0xf4 txntype:-1 reqpath:n / a错误路径:/ brokers / seqid错误时,出现了用户级KeeperException: KeeperErrorCode = / brokers / seqid的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,586]信息在处理sessionid:0x100435950880000 type:create cxid:0x7 zxid:0xf5 txntype:-1 reqpath:n / a错误路径:/ isr_change_notification错误:KeeperErrorCode =用于/ isr_change_notification的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,586]信息在处理sessionid:0x100435950880000 type:create cxid:0x8 zxid:0xf6 txntype:-1 reqpath:n / a错误路径:/ latest_producer_id_block错误:KeeperErrorCode =用于/ latest_producer_id_block的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,586]信息处理会话ID:0x100435950880000类型:create cxid:0x9 zxid:0xf7 txntype:-1 reqpath:n / a错误路径:/ log_dir_event_notification错误:KeeperErrorCode =用于/ log_dir_event_notification的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,602]信息在处理sessionid:0x100435950880000 type:create cxid:0xa zxid:0xf8 txntype:-1 reqpath:n / a错误路径:/ config / topics错误时,出现用户级KeeperException KeeperErrorCode =用于/ config / topics的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,602]信息在处理sessionid:0x100435950880000 type:create cxid:0xb zxid:0xf9 txntype:-1 reqpath:n / a错误路径:/ config / clients错误时,出现了用户级KeeperException: KeeperErrorCode =用于/ config / clients的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,617]信息在处理sessionid:0x100435950880000 type:create cxid:0xc zxid:0xfa txntype:-1 reqpath:n / a错误路径:/ config / users错误时,出现了用户级KeeperException: KeeperErrorCode =适用于/ config / users的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,617]信息在处理sessionid:0x100435950880000 type:create cxid:0xd zxid:0xfb txntype:-1 reqpath:n / a错误路径:/ config / brokers错误时,出现用户级KeeperException KeeperErrorCode =用于/ config / brokers的NodeExists(org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:53,564]信息在处理sessionid:0x100435950880000 type:multi cxid:0x3a zxid:0xff txntype:-1 reqpath:n /时,中止了用户级的KeeperException操作。错误路径:/ admin / preferred_replica_election错误:KeeperErrorCode =用于/ admin / preferred_replica_election的NoNode(org.apache.zookeeper.server.PrepRequestProcessor)
答案 0 :(得分:3)
在您的 application.yml 中,您指定了 zookeeper端口,而不是 kafka代理端口
spring:
kafka:
bootstrap-servers: localhost:8080
在上面,您应该定义 kafka代理的端口,即 server.properties 文件的port=
的值。
默认情况下,Spring启动应用程序在端口 8080 上运行,因此,除非已更改了Spring Boot应用程序的默认端口,否则请勿将其用于Zookeeper端口。
因此,在 server.properties 中,具有port=9092
和zookeeper.connect=localhost:2181
,在 application.yml 中,具有以下内容:>
spring:
kafka:
bootstrap-servers: localhost:9092
然后在 zookeeper.properties 中添加clientPort=2181
。然后以相同的顺序重新启动Zookeeper,Kafka服务器和Spring引导应用程序。
更新:
较新版本的Kafka在server.properties文件中使用listeners=PLAINTEXT://localhost:9092
而不是port=9092
。因此,尝试更换它。