我正在使用kafka binder测试Spring Cloud Stream,但出现错误
引起原因:org.springframework.messaging.MessageDeliveryException:调度程序没有频道“unknown.channel.name”的订阅者。;
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>
该玩具应用程序是模仿秘书在员工和老板之间传递请求。
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();
}
应用程序属性
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(":-(");
}
}
老板.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