Spring引导Kafka不起作用 - 消费者没有收到消息
[英]Spring boot Kafka doesn't work - consumer not receiving messages
问题描述
I'm trying to run a simple Spring Boot Kafka application but I can't make it work. 
我正在尝试运行一个简单的Spring Boot Kafka应用程序，但我无法使其工作。 I've followed various tutorials, now I'm implementing this one , but when I start the application this is what happens: 我已经按照各种教程，现在我正在实现这个 ，但是当我启动应用程序时，会发生以下情况：
I can write in the console, but the consumer doesn't receive any message. 我可以在控制台中写，但消费者不会收到任何消息。
This is my SpringApplication class: 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: application.yml：
spring:
kafka:
bootstrap-servers: localhost:8080
app:
topic:
foo: foo.t
logging:
level:
root: ERROR
org.springframework.web: ERROR
com.memorynotfound: DEBUG
Consumer class, Producer Class and their configurations' class are the same as written in the tutorial. 使用者类，生产者类及其配置类与本教程中编写的相同。
In my server.properties file I have: 在我的server.properties文件中，我有：
zookeeper.connect=localhost:8080
and in zookeeper.properties: 并在zookeeper.properties中：
clientPort=8080
Same port specified in application.yml. application.yml中指定的相同端口。 Before starting the application, I run 在开始申请之前，我跑了
.\bin\windows\zookeeper-server-start.bat config\zookeeper.properties
and 和
.\bin\windows\kafka-server-start.bat config\server.properties
UPDATE UPDATE
This is the ReceiverConfig class: 这是ReceiverConfig类：
@EnableKafka
@Configuration
public class ReceiverConfig {
@Value("${spring.kafka.bootstrap-servers}")
private String bootstrapServers;
@Bean
public Map<String, Object> consumerConfigs() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG, "foo");
props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
return props;
}
@Bean
public ConsumerFactory<String, String> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs());
}
@Bean
public KafkaListenerContainerFactory<ConcurrentMessageListenerContainer<String, String>> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
This is the SenderConfig class: 这是SenderConfig类：
@Configuration
public class SenderConfig {
@Value("${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());
}
}
And this is the method listen that is in the Consumer class 这是在Consumer类中的方法listen
@KafkaListener(topics = "${app.topic.foo}")
public void listen(@Payload String message) {
System.out.println("Received " + message);
}
Producer class: 制片人类：
@Service
public class Producer {
@Autowired
private KafkaTemplate<String, String> kafkaTemplate;
@Value("${app.topic.foo}")
private String topic;
public void send(String message){
kafkaTemplate.send(topic, message);
}
}
UPDATE 2 更新2
[2019-04-01 17:23:52,492] INFO Established session 0x100435950880000 with negotiated timeout 6000 for client /0:0:0:0:0:0:0:1:60079 (org.apache.zookeeper.server.ZooKeeperServer) [2019-04-01 17:23:52,539] INFO Got user-level KeeperException when processing sessionid:0x100435950880000 type:create cxid:0x1 zxid:0xef txntype:-1 reqpath:n/a Error Path:/consumers Error:KeeperErrorCode = NodeExists for /consumers (org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,555] INFO Got user-level KeeperException when processing sessionid:0x100435950880000 type:create cxid:0x2 zxid:0xf0 txntype:-1 reqpath:n/a Error Path:/brokers/ids Error:KeeperErrorCode = NodeExists for /brokers/ids (org.apache.zookeeper.server.PrepRequestProcessor) [2019-04-01 17:23:52,555] INFO Got user-level KeeperException when processing sessionid:0x100435950880000 type:create cxid:0x3 zxid:0xf1 txntype:-1 reqpath:n/a Error Path:/brokers/topics Error:KeeperErrorCode = NodeExists for /brokers/topics (org.apach
1 个解决方案
解决方案1
3 已采纳 2019-04-01 14:53:51
In your application.yml , you have specified the zookeeper port instead of the kafka broker port 在application.yml中 ，您指定了zookeeper端口而不是kafka代理端口
spring:
kafka:
bootstrap-servers: localhost:8080
In the above, you should be defining the port of the kafka broker , ie the value of port= of the server.properties file. 在上面，您应该定义kafka代理的端口，即server.properties文件的port=的值。
A Spring boot app runs by default on port 8080 , so please don't use the same for Zookeeper port, unless you have changed the default port of the Spring boot app. Spring启动应用程序默认在端口8080上运行，因此请不要对Zookeeper端口使用相同的操作，除非您更改了Spring启动应用程序的默认端口。
So in the server.properties , have port=9092 and zookeeper.connect=localhost:2181 , and in the application.yml , have as below: 所以在server.properties中 ，有port=9092和zookeeper.connect=localhost:2181 ，并在application.yml中 ，如下所示：
spring:
kafka:
bootstrap-servers: localhost:9092
Then in the zookeeper.properties , have clientPort=2181 . 然后在zookeeper.properties中 ，让clientPort=2181 。 Then restart the Zookeeper, the Kafka server and the Spring boot app in the same order. 然后以相同的顺序重新启动Zookeeper，Kafka服务器和Spring启动应用程序。
Update: 更新：
Newer versions of Kafka uses listeners=PLAINTEXT://localhost:9092 instead of port=9092 in the server.properties file. 较新版本的Kafka在server.properties文件中使用listeners=PLAINTEXT://localhost:9092而不是port=9092 。 So try replacing that. 所以尝试替换它。
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.