Spring Integration Dispatcher没有频道订阅者

发布时间：2020-12-15 01:43:31 所属栏目：大数据来源：网络整理

导读：我正在使用spring集成及其对MQTT的支持;我看到了spring集成文档,我的简单测试用例是在MQTT主题上发布消息. Spring文档位于：http://docs.spring.io/spring-integration/reference/html/mqtt.html#_configuring_with_java_configuration_15 我正在使用这些版

我正在使用spring集成及其对MQTT的支持;我看到了spring集成文档,我的简单测试用例是在MQTT主题上发布消息. Spring文档位于：http://docs.spring.io/spring-integration/reference/html/mqtt.html#_configuring_with_java_configuration_15

我正在使用这些版本：

>春天4.3.4
>春季整合4.3.5

我构建了这个简单的配置类：

@Configuration
@IntegrationComponentScan
public class CommunicationServerApplication
{
    @Bean
    public MqttPahoClientFactory mqttClientFactory()
    {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setServerURIs(mqttServerUris);
        if (StringUtils.hasText(mqttUsername) && StringUtils.hasText(mqttPassword))
        {

            factory.setUserName(mqttUsername);
            factory.setPassword(mqttPassword);
        }
        factory.setConnectionTimeout(mqttConnectionTimeout);
        factory.setKeepAliveInterval(mqttKeepAliveInterval);
        factory.setPersistence(new MqttDefaultFilePersistence(mqttPersistenceFileDirectory));
        return factory;
    }

    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel",autoStartup="true")
    public MessageHandler mqttOutbound()
    {
        String clientId = mqttClientId;
        if( !StringUtils.hasText(clientId) )
        {
            clientId = UUID.randomUUID().toString();
        }
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientId,mqttClientFactory());
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic(mqttTopic);
        if( mqttQos >= 0 && mqttQos <=2 )
        {

            messageHandler.setDefaultQos(mqttQos);
        }
        return messageHandler;
    }

    @Bean
    public MessageChannel mqttOutboundChannel()
    {
        DirectChannel dc = new DirectChannel();
        return dc;
    }

    @MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
    public interface MqttMsgproducer
    {

        void sendToMqtt(String data);
    }
}

然后我使用了这个简单的测试用例：

@ContextConfiguration(value ={ "classpath:app-ctx.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class SimpleMqttTestSuite
{
    private static final Logger logger = LoggerFactory.getLogger(SimpleMqttTestSuite.class.getName());
    @Autowired
    private MqttMsgproducer sender;
    @Test
    public void startServerTest()
    {
        try
        {
            sender.sendToMqtt("Hello");
        }
        catch (Exception e)
        {
            logger.error("Error",e);
        }
    }
}

我的app-ctx.xml是：


执行简单测试,我遇到了这个错误：

2016-12-20 10:46:33,889 49967 [nioEventLoopGroup-3-1] ERROR - Errore 
org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'org.springframework.context.support.GenericApplicationContext@2e6a8155.mqttOutboundChannel'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:81) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:423) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:373) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115) ~[spring-messaging-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:45) ~[spring-messaging-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:105) ~[spring-messaging-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:143) ~[spring-messaging-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:135) ~[spring-messaging-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.integration.gateway.MessagingGatewaySupport.send(MessagingGatewaySupport.java:375) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.invokeGatewayMethod(GatewayProxyFactoryBean.java:477) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.doInvoke(GatewayProxyFactoryBean.java:429) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.invoke(GatewayProxyFactoryBean.java:420) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.integration.gateway.GatewayCompletableFutureProxyFactoryBean.invoke(GatewayCompletableFutureProxyFactoryBean.java:65) ~[spring-integration-core-4.3.5.RELEASE.jar:4.3.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.4.RELEASE.jar:4.3.4.RELEASE]

我无法想象我在配置中缺少什么.任何人都可以给我一个提示吗？
谢谢
安杰洛


最佳答案
您的解决方案不正确 – 您不能在通道bean定义中订阅.我相信你的问题是你在课堂上缺少@EnableIntegration.
                        （编辑：李大同）
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