我用spring-cloud-stream無法發送消息，但是可以接收消息

Question

StreamInput.java

public interface StreamInput {
    String QUEUE = "cherryQueue";
    @Input(StreamInput.QUEUE)
    SubscribableChannel input();
}

StreamOutput.java

public interface StreamOutput {
    @Output(StreamInput.QUEUE)
    MessageChannel output();
}

StreamReceiver.java

@Slf4j
@Component
@EnableBinding(StreamInput.class)
public class StreamReceiver {
    @StreamListener(StreamInput.QUEUE)
    public void process(Object message){
    log.info("receive message:{}",message);
    log.info("--------------------------------------------------");
    }
}

springboot項目啟動正常，隊列創建成功： 在此處輸入圖像描述

================================================== ======================但是！我使用StreamOutput，它不起作用。

這是測試用例：

@Slf4j
@RunWith(SpringRunner.class)
@SpringBootTest
@EnableBinding(StreamOutput.class)
public class MessageTest {

    @Autowired
    private StreamOutput streamOutput;

    @Test
    public void sentMessageTest() {
        streamOutput.output()
                .send(MessageBuilder.withPayload("now time is :" + new Date()).build());
        log.info("the message send OK !!!");
    }

}

這是異常信息：

java.lang.IllegalStateException: Failed to load ApplicationContext

    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'cherryQueue' defined in com.cherry.order.message.StreamInput: bean definition with this name already exists - Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=com.cherry.order.message.MessageTest$StreamOutput; factoryMethodName=output; initMethodName=null; destroyMethodName=null
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerBindingTargetBeanDefinition(BindingBeanDefinitionRegistryUtils.java:64)
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerInputBindingTargetBeanDefinition(BindingBeanDefinitionRegistryUtils.java:47)
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.lambda$registerBindingTargetBeanDefinitions$0(BindingBeanDefinitionRegistryUtils.java:80)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:562)
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:541)
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerBindingTargetBeanDefinitions(BindingBeanDefinitionRegistryUtils.java:76)
    at org.springframework.cloud.stream.config.BindingBeansRegistrar.registerBeanDefinitions(BindingBeansRegistrar.java:45)
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:358)
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:357)
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:145)
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:117)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:328)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:233)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:273)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:139)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
    ... 24 more

Answer 1

由以下原因引起：org.springframework.beans.factory.BeanDefinitionStoreException：com.cherry.order.message.StreamInput中定義的名稱為“ cherryQueue”的無效的bean定義： 具有該名稱的bean定義已經存在 -根bean：類[null]; 范圍=; 抽象= FALSE; lazyInit = FALSE; autowireMode = 0; dependencyCheck = 0; autowireCandidate = TRUE; 初級= FALSE; factoryBeanName = com.cherry.order.message.MessageTest $ StreamOutput; factoryMethodName =輸出; initMethodName = NULL; destroyMethodName = NULL

我認為錯誤很明顯。

@Output(StreamInput.QUEUE)

您不能為2個頻道使用相同的頻道名稱。

如果您希望在同一應用程序中從同一目標生成和使用消息（這有點不尋常），則必須使用2個通道，並將其綁定配置為引用相同的目標。

Answer 2

為什么這種情況不尋常，我確實計划最初開發兩個微服務作為一個應用程序，以加快開發速度並使用消息進行通信。

一切都在使用純Rabbit進行，現在當我切換到Spring Cloud Stream時它停止了。

我的確在另一個微服務中還有另一個“真實”接收器。

用不同的“ bean名稱”和覆蓋的目標定義接收器和源仍然無法正常工作，因為我懷疑Spring使用相同的線程（DirectChannel）將消息從源轉發到內部接收器（跳過兔子！）。