错误：无法指定多个目的地

我正在尝试配置向两个输出流发送消息，如下所示。

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

我跟着这个例子

它给出了以下错误。

java.lang.IllegalArgumentException：无法在 org.springframework.util.Assert.isTrue(Assert.java:118) at org.springframework.cloud.stream.binding.StreamListenerMethodUtils.getOutboundBindingTargetName(StreamListenerMethodUtils.java:146) at 指定多个目的地org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor$DefaultStreamListenerSetupMethodOrchestrator.orchestrateStreamListenerSetupMethod(StreamListenerAnnotationBeanPostProcessor.java:349) at org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.doPostProcess(StreamListenerAnnotation:BeanPostProcessor.java:349) java.lang.Iterable 中的 stream.binding.StreamListenerAnnotationBeanPostProcessor.lambda$postProcessAfterInitialization$0(StreamListenerAnnotationBeanPostProcessor.java:167)。forEach(Ite​​rable.java:75) 在 org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.injectAndPostProcessDependencies(StreamListenerAnnotationBeanPostProcessor.java:285) 在 org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletListenerAnnotationBean1 或 PostProcessDependencies(StreamListenerAnnotationBeanPostProcessor.java:285)在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:863) 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) 在 org.springframework.context.support.Abs .refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleStreamListenerAnnotationBeanPostProcessor.injectAndPostProcessDependencies(StreamListenerAnnotationBeanPostProcessor.java:285) 在 org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 在 org.springframework.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 863) 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleStreamListenerAnnotationBeanPostProcessor.injectAndPostProcessDependencies(StreamListenerAnnotationBeanPostProcessor.java:285) 在 org.springframework.cloud.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 在 org.springframework.stream.binding.StreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 863) 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleStreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:863) 在 org.springframework.context.support.AbsishBeanFactoryInitApplication6Initialization(StreamListenerAnnotationBeanPostProcessor.java:105)在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleStreamListenerAnnotationBeanPostProcessor.afterSingletonsInstantiated(StreamListenerAnnotationBeanPostProcessor.java:105) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:863) 在 org.springframework.context.support.AbsishBeanFactoryInitApplication6Initialization(StreamListenerAnnotationBeanPostProcessor.java:105)在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleFinishBeanFactoryInitialization(AbstractApplicationContext.java:863) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servleFinishBeanFactoryInitialization(AbstractApplicationContext.java:863) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) 在 org.springframework.boot.web.servle