В тесте stream-rabbitmq возникает ошибка: у Dispatcher нет подписчиков на канал

Question

Я кодирую тестовый класс для использования spring-cloud-starter-stream-rabbit, когда я только запускаю приемник и отправляю сообщение от rabbitmq, это работает;но когда я запускаю тестовый класс отправителя, возникает ошибка: org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel, что мне сделать, чтобы исправить это?

Мой шаг:

Во-первых, запустить SpringbootApplication Во-вторых, запустить JUnittest

spring-boot-starter-parent 2.1.3.RELEASE JDK8 rabbitmq utf8

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.springcloud</groupId>
    <artifactId>stream-hello</artifactId>
    <version>1.0</version>
    <name>stream-hello</name>
    <description>SpringCloud Project</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

SinkReceiver.java

@EnableBinding({Sink.class})
public class SinkReceiver {
    private static Logger logger = LoggerFactory.getLogger(SinkReceiver.class);

    @StreamListener(Sink.INPUT)
    public void receive(Object payload) {
        logger.info("Received: " + payload);
    }

}

StreamHelloApplication.java

@SpringBootApplication
public class StreamHelloApplication {
    public static void main(String[] args) {
        SpringApplication.run(StreamHelloApplication.class, args);
    }
}

StreamHelloApplicationTests.java

@RunWith(SpringRunner.class)
@EnableBinding(value = {StreamHelloApplicationTests.SinkSender.class})
public class StreamHelloApplicationTests {

    @Autowired
    private SinkSender sinkSender;

    @Test
    public void sinkSenderTester() {
        sinkSender.output().send(MessageBuilder.withPayload("produce a message : sinkSenderTest").build());
    }

    public interface SinkSender {
        String OUTPUT = "input";

        @Output(SinkSender.OUTPUT)
        MessageChannel output();
    }

}

application.properties

spring.application.name=stream-hello

#config rabbitmq
spring.rabbitmq.host=localhost
spring.rabbitmq.port=35672
spring.rabbitmq.username=admin
spring.rabbitmq.password=123456

Я ожидаю, что тест junit может быть выполнен успешно, но он выполняетсявозникает ошибка.трассировка стека, как следует:

org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'org.springframework.context.support.GenericApplicationContext@68ceda24.input'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=byte[34], headers={contentType=application/json, id=fc0a6890-4945-142b-55cd-668b0d3f22ed, timestamp=1555817595975}], failedMessage=GenericMessage [payload=byte[34], headers={contentType=application/json, id=fc0a6890-4945-142b-55cd-668b0d3f22ed, timestamp=1555817595975}]
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:461)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:401)
    at com.springcloud.StreamHelloApplicationTests.sinkSenderTester(StreamHelloApplicationTests.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    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.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers, failedMessage=GenericMessage [payload=byte[34], headers={contentType=application/json, id=fc0a6890-4945-142b-55cd-668b0d3f22ed, timestamp=1555817595975}]
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:138)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:105)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:73)
    ... 34 more

Answer 1

Ваш обязательный интерфейс SinkSender ни к чему не привязан. «Входной» канал создан, но подписчика нет. И ваш SinkReceiver даже не является частью теста. Для проверки прочитайте Testing руководства пользователя, особенно новое test binder . Вышеуказанный раздел также содержит полные рабочие образцы.