spring cloud stream kafka:“调度程序没有订阅者"；错误 [英] spring cloud stream kafka: "Dispatcher has no subscribers" error
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问题描述
我正在使用 kafka binder 测试 spring cloud stream，但出现错误
I am testing spring cloud stream with kafka binder, but got an error
引起:org.springframework.messaging.MessageDeliveryException:Dispatcher 没有频道unknown.channel.name"的订阅者.；
Caused by: org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'unknown.channel.name'.;
pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream</artifactId>
<version>1.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka</artifactId>
<version>1.1.2.RELEASE</version>
</dependency>
</dependencies>
玩具应用程序是模仿秘书在员工和老板之间传递请求.
The toy application is to imitate a secretary who transfer requests between employee and boss.
员工界面:
public interface SecretaryServingEmployee {
@Output
MessageChannel inbox();
@Input
SubscribableChannel rejected();
@Input
SubscribableChannel approved();
}
boss界面:
public interface SecretaryServingBoss {
@Input
SubscribableChannel inbox();
@Output
MessageChannel rejected();
@Output
MessageChannel approved();
}
application.properties
application.properties
server.port=8080
spring.cloud.stream.bindings.inbox.destination=inbox
spring.cloud.stream.bindings.approved.destination=approved
spring.cloud.stream.bindings.rejected.destination=rejected
员工.java
@EnableBinding(SecretaryServingEmployee.class)
@Component
public class Employee {
private static Logger logger = LoggerFactory.getLogger(Employee.class);
private SecretaryServingEmployee adminAssistent;
@Autowired
public Employee(SecretaryServingEmployee adminAssistent) {
this.adminAssistent = adminAssistent;
}
@InboundChannelAdapter(value = "inbox")
public String messageSource() {
return "You are handsome!!"; // This is the message sent to boss
}
@ServiceActivator(inputChannel="approved")
public void checkApproved(String message) {
logger.info(":-)");
}
@ServiceActivator(inputChannel="rejected")
public void checkRejected(RejectionLetter letter) {
logger.warn(":-(");
}
}
Boss.java
@EnableBinding(SecretaryServingBoss.class)
@Component
public class Boss {
private SecretaryServingBoss adminAssistent;
@Autowired
public Boss(SecretaryServingBoss adminAssistent) {
this.adminAssistent = adminAssistent;
}
@ServiceActivator(inputChannel="inbox")
public void sign(String content) {
if (content.contains("You are handsome")) {
adminAssistent.approved().send(message("nice work"));
}
else {
adminAssistent.rejected().send(message("Don't send me shit"));
}
}
private <T> Message<T> message(T content) {
return MessageBuilder.withPayload(content).build();
}
}
这是跟踪的一部分
org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'unknown.channel.name'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:81) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:373) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:292) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:212) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:129) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:115) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.channel.FixedSubscriberChannel.send(FixedSubscriberChannel.java:70) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.channel.FixedSubscriberChannel.send(FixedSubscriberChannel.java:64) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105) ~[spring-messaging-4.3.2.RELEASE.jar:4.3.2.RELEASE]
at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:171) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter.access$000(KafkaMessageDrivenChannelAdapter.java:47) ~[spring-integration-kafka-2.0.1.RELEASE.jar:na]
at org.springframework.integration.kafka.inbound.KafkaMessageDrivenChannelAdapter$IntegrationMessageListener.onMessage(KafkaMessageDrivenChannelAdapter.java:197) ~[spring-integration-kafka-2.0.1.RELEASE.jar:na]
at org.springframework.kafka.listener.adapter.RetryingAcknowledgingMessageListenerAdapter$1.doWithRetry(RetryingAcknowledgingMessageListenerAdapter.java:76) ~[spring-kafka-1.0.5.RELEASE.jar:na]
at org.springframework.kafka.listener.adapter.RetryingAcknowledgingMessageListenerAdapter$1.doWithRetry(RetryingAcknowledgingMessageListenerAdapter.java:71) ~[spring-kafka-1.0.5.RELEASE.jar:na]
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:276) ~[spring-retry-1.1.3.RELEASE.jar:na]
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:172) ~[spring-retry-1.1.3.RELEASE.jar:na]
at org.springframework.kafka.listener.adapter.RetryingAcknowledgingMessageListenerAdapter.onMessage(RetryingAcknowledgingMessageListenerAdapter.java:71) ~[spring-kafka-1.0.5.RELEASE.jar:na]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:597) [spring-kafka-1.0.5.RELEASE.jar:na]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.access$1800(KafkaMessageListenerContainer.java:222) [spring-kafka-1.0.5.RELEASE.jar:na]
at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer$ListenerInvoker.run(KafkaMessageListenerContainer.java:772) [spring-kafka-1.0.5.RELEASE.jar:na]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [na:1.8.0_121]
at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_121]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_121]
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:154) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:121) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77) ~[spring-integration-core-4.3.1.RELEASE.jar:4.3.1.RELEASE]
... 29 common frames omitted
推荐答案
看起来您的应用程序类没有正确地进行组件扫描.
It looks like your application classes aren't component scanned properly.
如果您将它作为 Spring Boot 应用程序运行，您能否确保要扫描的类是否正确打包.
If you are running this as a Spring Boot application, can you make sure if you have the classes to be scanned are packaged correctly.
例如，默认情况下@SpringBootApplication的组件扫描会查看@SpringBootApplication注释类所在的同一包下的类.
For instance, by default @SpringBootApplication's component scan looks at the classes under the same package where the @SpringBootApplication annotated class is.
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