Question

当我使用spring cloud stream自定义频道时，我使用了@Input（Sink.INPUT）和@Output（Sink.INPUT）。发生以下错误。

2018-04-24 09:05:56.432 ERROR 5916 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'input' defined in com.example.streamrabbitmq.output.SinkSender: 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=org.springframework.cloud.stream.messaging.Sink; factoryMethodName=input; initMethodName=null; destroyMethodName=null
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerBindingTargetBeanDefinition(BindingBeanDefinitionRegistryUtils.java:64) ~[spring-cloud-stream-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerOutputBindingTargetBeanDefinition(BindingBeanDefinitionRegistryUtils.java:54) ~[spring-cloud-stream-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils$1.doWith(BindingBeanDefinitionRegistryUtils.java:88) ~[spring-cloud-stream-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:530) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:510) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.cloud.stream.binding.BindingBeanDefinitionRegistryUtils.registerBindingTargetBeanDefinitions(BindingBeanDefinitionRegistryUtils.java:76) ~[spring-cloud-stream-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.cloud.stream.config.BindingBeansRegistrar.registerBeanDefinitions(BindingBeansRegistrar.java:45) ~[spring-cloud-stream-1.3.2.RELEASE.jar:1.3.2.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:359) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:143) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:116) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:320) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:272) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:92) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
    at com.example.streamrabbitmq.StreamRabbitmqApplication.main(StreamRabbitmqApplication.java:10) [classes/:na]


Process finished with exit code 1

的pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
</dependency>

MySink.java

public interface MySink {
    @Input(Sink.INPUT)
    SubscribableChannel input();
}

SinkSender.java

public interface SinkSender {

    String OUTPUT = "MyOutput";

    @Output(Sink.INPUT)
    MessageChannel output();

}

我哪里出错了？

Answer 1

该错误只是表明您正在尝试在已存在的绑定名称下注册绑定。。。你也是。只需看看你的绑定接口：

public interface MySink {
    @Input(Sink.INPUT) // will be named "input"
    SubscribableChannel input(); 
}
public interface SinkSender {
    @Output(Sink.INPUT) // will be named "input" as well
    MessageChannel output();
}

那就是说，我想知道你想要完成什么？

Answer 2

要创建频道，您只需使用@Bean对其进行注释，然后返回新的频道实施。

@Bean
MessageChannel output() {
   return new DirectChannel();
}

以上将创建一个名为'output'的DirectChannel频道。以上所有内容都在Spring Cloud Stream之外，并且是纯粹的Spring和Spring集成。

您正在使用的注释是特定于Spring Cloud Stream以与外部目标建立绑定（即Rabbit队列/交换或Kafka主题）。我建议阅读this section，更详细地解释一下。

spring cloud stream @Input（Sink.INPUT）和@Output（Sink.INPUT）已经存在Bean

2 个答案: