Question

我正在尝试将发送消息配置为如下所示的两个输出流。

@StreamListener(SampleBinding.INPUT1)
@SendTo({SampleBinding.OUTPUT1, SampleBinding.OUTPUT2})
public String handleM(String sampleMessage){
    log.info("Received message="+sampleMessage.toString());
    sampleMessage=sampleMessage.toUpperCase();
    return sampleMessage;
}

我遵循了这个example

出现以下错误。

java.lang.IllegalArgumentException：无法指定多个目的地在org.springframework.util.Assert.isTrue（Assert.java:118）在org.springframework.cloud.stream.binding.StreamListenerMethodUtils.getOutboundBindingTargetName（StreamListenerMethodUtils.java:146）处在org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor $ DefaultStreamListenerSetupMethodOrchestrator.orchestrateStreamListenerSetupMethod（StreamListenerAnnotationBeanPostProcessor.java:349）处在org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.doPostProcess（StreamListenerAnnotationBeanPostProcessor.java:195）处在org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.lambda $ postProcessAfterInitialization $ 0（StreamListenerAnnotationBeanPostProcessor.java:167）在java.lang.Iterable.forEach（Iterable.java:75）在org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.injectAndPostProcessDependencies（StreamListenerAnnotationBeanPostProcessor.java:285）处在org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated（StreamListenerAnnotationBeanPostProcessor.java:105）处在org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:863）在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:863）处在org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:546）在org.springframework.boot.web.servle

Answer 1

使用基于常规StreamListener的活页夹时，无法通过MessageChannel方法发送到多个目的地。可以使用您在上面提供的链接中引用的Kafka Streams活页夹的分支功能将多个主题发送给您。如果要发送到应用程序中的多个目标，一种选择是使用Spring Cloud Stream的动态目标功能。 Here is an example关于动态目的地的工作方式。

错误：无法指定多个目的地

1 个答案: