Java Spring集成：Dispatcher没有通道'；未知.channel.name'；

让我先说一下，我让这段代码正常工作，但我做了一些事情，无论如何都无法让它正常工作

我正在编写一个专门使用Java配置的小型Spring集成应用程序

以下是我收到错误时的日志：

pool-3-thread-2 || INFO  o.s.i.e.EventDrivenConsumer || Adding {bridge:null} as a subscriber to the 'null' channel
pool-3-thread-2 || INFO  o.s.i.c.DirectChannel || Channel 'unknown.channel.name' has 1 subscriber(s).
pool-3-thread-2 || INFO  o.s.i.e.EventDrivenConsumer || started org.springframework.integration.endpoint.EventDrivenConsumer@282097a6
pool-3-thread-2 || DEBUG o.s.b.f.s.DefaultListableBeanFactory || Returning cached instance of singleton bean 'integrationGlobalProperties'
pool-3-thread-2 || DEBUG o.s.i.c.DirectChannel || preSend on channel 'org.springframework.integration.channel.DirectChannel@6d16efa2', message: GenericMessage [payload=byte[244], headers={replyChannel=org.springframework.messaging.core.GenericMessagingTemplate$TemporaryReplyChannel@36ebee89, errorChannel=org.springframework.messaging.core.GenericMessagingTemplate$TemporaryReplyChannel@36ebee89, ip_tcp_remotePort=42432, ip_connectionId=localhost6.localdomain6:42432:8080:c93ee59a-17e3-4c19-98a5-6bb374652181, ip_localInetAddress=/0:0:0:0:0:0:0:1, ip_address=0:0:0:0:0:0:0:1, id=54cbd13c-bb4b-0986-8bc1-93d436884be7, ip_hostname=localhost6.localdomain6, timestamp=1460066984381}]
pool-3-thread-2 || DEBUG o.s.i.i.t.TcpInboundGateway || failure occurred in gateway sendAndReceive: Dispatcher has no subscribers for channel 'unknown.channel.name'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
pool-3-thread-2 || ERROR o.s.i.i.t.c.TcpNetConnection || Exception sending message: GenericMessage [payload=byte[244], headers={ip_tcp_remotePort=42432, ip_connectionId=localhost6.localdomain6:42432:8080:c93ee59a-17e3-4c19-98a5-6bb374652181, ip_localInetAddress=/0:0:0:0:0:0:0:1, ip_address=0:0:0:0:0:0:0:1, id=972d1c96-238a-2598-b488-50c00710f12b, ip_hostname=localhost6.localdomain6, timestamp=1460066984373}]
org.springframework.messaging.MessageDeliveryException: Dispatcher has no subscribers for channel 'unknown.channel.name'.; nested exception is org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
        at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:81)
        at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:442)
        at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:115)
        at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:150)
        at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive(GenericMessagingTemplate.java:45)
        at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive(AbstractMessagingTemplate.java:42)
        at org.springframework.integration.core.MessagingTemplate.sendAndReceive(MessagingTemplate.java:97)
        at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive(MessagingGatewaySupport.java:422)
        at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage(MessagingGatewaySupport.java:390)
        at org.springframework.integration.ip.tcp.TcpInboundGateway.doOnMessage(TcpInboundGateway.java:119)
        at org.springframework.integration.ip.tcp.TcpInboundGateway.onMessage(TcpInboundGateway.java:97)
        at org.springframework.integration.ip.tcp.connection.TcpNetConnection.run(TcpNetConnection.java:182)
        at java.util.concurrent.ThreadPoolExecutor.runWorkadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.integration.MessageDispatchingException: Dispatcher has no subscribers
        at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:153)
        at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:120)
        at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
        ... 14 common frames omitted

最令人困惑的部分是unknown.channel.name部分。我不知道这是从哪里来的，在错误发生之前，日志中没有提到过一次

有两个类利用Spring集成：

AppConfig.java

package com.acme.project.spring;


@EnableAutoConfiguration
@EnableIntegration
@IntegrationComponentScan
@Configuration
@PropertySource(name = "props", value = "classpath:/application.properties")
public class AppConfig {

    @Autowired
    Environment env;


    @Bean(name = "inputChannel")
    public static MessageChannel inputChannel() {
        return new DirectChannel();
    }

    @Bean(name = "handlerChannel")
    public static MessageChannel handlerChannel() {
        return new DirectChannel();
    }

    @Bean(name = "replyChannel")
    public static MessageChannel replyChannel() {
        return new DirectChannel();
    }

    @MessagingGateway(defaultRequestChannel = "handlerChannel")
    public interface Gateway {
        String send(String request);
    }

    @Bean(name = "inputGateway")
    public TcpInboundGateway inputGateway(AbstractServerConnectionFactory connectionFactory) {
        LOGGER.info("get inputGateway");
        TcpInboundGateway gw = new TcpInboundGateway();
        gw.setConnectionFactory(connectionFactory);
        gw.setRequestChannel(inputChannel());
        gw.setReplyChannel(replyChannel());
        return gw;
    }


    @Bean(name = "serverFactory")
    public AbstractServerConnectionFactory serverFactory() {
        Integer port = Integer.parseInt(env.getProperty("portNumber"));
        AbstractServerConnectionFactory factory = new TcpNetServerConnectionFactory(port);
        factory.setSerializer(serializer());
        factory.setDeserializer(deserializer());
        return factory;
    }


    @Transformer(inputChannel = "replyChannel")
    public String convertFromMyObject(MyObject obj) {
        ... 
        return obj.toString();
    }

    @Transformer(inputChannel = "inputChannel")
    public MyObject convertToMyObject(byte[] bytes) {
       ...
       return new MyObject(bytes);
    }

    @Bean(name="serializer")
    public Serializer serializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "deserializer")
    public Deserializer deserializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "a")
    public A getA() {
        return new A();
    }

    @Bean(name = "b")
    public B getB() {
        return new B();
    }
}

package com.acme.project.spring;

@MessageEndpoint
public class Handler {

    @Autowired
    private A a;

    @Autowired
    private B b;


    @ServiceActivator(inputChannel = "handlerChannel", outputChannel = "replyChannel")
    public MyObject handle(MyObject request) {
            MyObject response = new MyObject();
            ...
            return response;
    }


    public void setA(A a) {
        this.a = a;
    }

    public void setB(B b) {
        this.b = b;
    }

}

public class Main {
    public static void main(String... args) {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext("com.acme.project.spring");
        ctx.registerShutdownHook();
    }
}

========

Handler.java

package com.acme.project.spring;


@EnableAutoConfiguration
@EnableIntegration
@IntegrationComponentScan
@Configuration
@PropertySource(name = "props", value = "classpath:/application.properties")
public class AppConfig {

    @Autowired
    Environment env;


    @Bean(name = "inputChannel")
    public static MessageChannel inputChannel() {
        return new DirectChannel();
    }

    @Bean(name = "handlerChannel")
    public static MessageChannel handlerChannel() {
        return new DirectChannel();
    }

    @Bean(name = "replyChannel")
    public static MessageChannel replyChannel() {
        return new DirectChannel();
    }

    @MessagingGateway(defaultRequestChannel = "handlerChannel")
    public interface Gateway {
        String send(String request);
    }

    @Bean(name = "inputGateway")
    public TcpInboundGateway inputGateway(AbstractServerConnectionFactory connectionFactory) {
        LOGGER.info("get inputGateway");
        TcpInboundGateway gw = new TcpInboundGateway();
        gw.setConnectionFactory(connectionFactory);
        gw.setRequestChannel(inputChannel());
        gw.setReplyChannel(replyChannel());
        return gw;
    }


    @Bean(name = "serverFactory")
    public AbstractServerConnectionFactory serverFactory() {
        Integer port = Integer.parseInt(env.getProperty("portNumber"));
        AbstractServerConnectionFactory factory = new TcpNetServerConnectionFactory(port);
        factory.setSerializer(serializer());
        factory.setDeserializer(deserializer());
        return factory;
    }


    @Transformer(inputChannel = "replyChannel")
    public String convertFromMyObject(MyObject obj) {
        ... 
        return obj.toString();
    }

    @Transformer(inputChannel = "inputChannel")
    public MyObject convertToMyObject(byte[] bytes) {
       ...
       return new MyObject(bytes);
    }

    @Bean(name="serializer")
    public Serializer serializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "deserializer")
    public Deserializer deserializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "a")
    public A getA() {
        return new A();
    }

    @Bean(name = "b")
    public B getB() {
        return new B();
    }
}

package com.acme.project.spring;

@MessageEndpoint
public class Handler {

    @Autowired
    private A a;

    @Autowired
    private B b;


    @ServiceActivator(inputChannel = "handlerChannel", outputChannel = "replyChannel")
    public MyObject handle(MyObject request) {
            MyObject response = new MyObject();
            ...
            return response;
    }


    public void setA(A a) {
        this.a = a;
    }

    public void setB(B b) {
        this.b = b;
    }

}

public class Main {
    public static void main(String... args) {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext("com.acme.project.spring");
        ctx.registerShutdownHook();
    }
}

Main.java

package com.acme.project.spring;


@EnableAutoConfiguration
@EnableIntegration
@IntegrationComponentScan
@Configuration
@PropertySource(name = "props", value = "classpath:/application.properties")
public class AppConfig {

    @Autowired
    Environment env;


    @Bean(name = "inputChannel")
    public static MessageChannel inputChannel() {
        return new DirectChannel();
    }

    @Bean(name = "handlerChannel")
    public static MessageChannel handlerChannel() {
        return new DirectChannel();
    }

    @Bean(name = "replyChannel")
    public static MessageChannel replyChannel() {
        return new DirectChannel();
    }

    @MessagingGateway(defaultRequestChannel = "handlerChannel")
    public interface Gateway {
        String send(String request);
    }

    @Bean(name = "inputGateway")
    public TcpInboundGateway inputGateway(AbstractServerConnectionFactory connectionFactory) {
        LOGGER.info("get inputGateway");
        TcpInboundGateway gw = new TcpInboundGateway();
        gw.setConnectionFactory(connectionFactory);
        gw.setRequestChannel(inputChannel());
        gw.setReplyChannel(replyChannel());
        return gw;
    }


    @Bean(name = "serverFactory")
    public AbstractServerConnectionFactory serverFactory() {
        Integer port = Integer.parseInt(env.getProperty("portNumber"));
        AbstractServerConnectionFactory factory = new TcpNetServerConnectionFactory(port);
        factory.setSerializer(serializer());
        factory.setDeserializer(deserializer());
        return factory;
    }


    @Transformer(inputChannel = "replyChannel")
    public String convertFromMyObject(MyObject obj) {
        ... 
        return obj.toString();
    }

    @Transformer(inputChannel = "inputChannel")
    public MyObject convertToMyObject(byte[] bytes) {
       ...
       return new MyObject(bytes);
    }

    @Bean(name="serializer")
    public Serializer serializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "deserializer")
    public Deserializer deserializer() {
        return new ByteArrayCrLfSerializer();
    }

    @Bean(name = "a")
    public A getA() {
        return new A();
    }

    @Bean(name = "b")
    public B getB() {
        return new B();
    }
}

package com.acme.project.spring;

@MessageEndpoint
public class Handler {

    @Autowired
    private A a;

    @Autowired
    private B b;


    @ServiceActivator(inputChannel = "handlerChannel", outputChannel = "replyChannel")
    public MyObject handle(MyObject request) {
            MyObject response = new MyObject();
            ...
            return response;
    }


    public void setA(A a) {
        this.a = a;
    }

    public void setB(B b) {
        this.b = b;
    }

}

public class Main {
    public static void main(String... args) {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext("com.acme.project.spring");
        ctx.registerShutdownHook();
    }
}

我认为这很简单。我剥离了所有非Spring部分——特别是业务逻辑等——并简化了一些类名（A/B）。基本上，我有3个通道：inputChannel、replyChannel和handlerChannel。正如我在工作时所理解的，流程是：

serverFactory->serializer->inputChannel->transformer（convertToMyObject）->handlerChannel->ServiceActivator（Handler#handle）->transformer（convertFromMyObject）->replyChannel->返回客户端

任何有助于确定“unknown.channel.name”是什么、是什么导致现在存在以及调度器出了什么问题的帮助都将非常有用。我觉得它应该相对简单——也许是一个混乱的注释——但我就是看不出来

---

谢谢，

我完成Spring集成已经有一段时间了，我只使用XML配置完成了。然而，我无法勾勒出你的流程。作为提示，如果您将服务激活器和转换等放入一个链中，您不必在它们之间连接通道，Spring会为您这样做。我已经完成Spring集成有一段时间了，我只使用XML配置完成了。然而，我无法勾勒出你的流程。作为提示，如果您将服务激活器和转换等放入一个链中，您不必在它们之间连接通道，Spring会为您这样做。