Question

我在我的应用程序中收到错误，我没有得到解决方案。应用程序请求REST / JSON并尝试与另一个应用程序通信。有一个轮询器可以异步调用每个请求。当一个请求总是调度错误“没有输出通道或replyChannel标头可用”并且它被重定向到errorChannel句柄。

...
@Bean(name = PollerMetadata.DEFAULT_POLLER)
public PollerMetadata poller() {
    return Pollers              
            .fixedRate(NumberUtils.createLong(QUEUE_RATE))
            .get();
}

    @Bean
public MessageChannel errorChannel() {
    return MessageChannels.direct().get();
}

    @MessagingGateway 
public static interface HttpService {
    @Gateway(requestChannel = "service.input")
    void send(@Payload String body, @Headers MultiValueMap<String, String> headers);        
}


public MessageHandler httpOutboundAdapter(){
    HttpRequestExecutingMessageHandler handler = 
            Http.outboundGateway(URI, restTemplate)             
            .expectedResponseType(String.class)         
            .httpMethod(HttpMethod.POST)
            .mappedRequestHeaders("Authorization","Accept","Content-Type", "X-User-Email","X-User-Token")               
            .get();

    return handler;
}


@Bean
public FileWritingMessageHandler fileOutboundAdapter(){
    FileWritingMessageHandler fwmhs = Files
            .outboundAdapter(new File("logs/errors"))
            .autoCreateDirectory(true)
            .get();     

    return fwmhs;
}   

    @Bean
public IntegrationFlow send(){  
    return IntegrationFlows.from("service.input")
            .log(Level.DEBUG, "trace.http",
                    "'Request.\n'"+
                    ".concat('Headers : ').concat(headers.toString()).concat('\n')"+
                    ".concat('Payload : ').concat(payload.toString())"
                )                               
            .channel(MessageChannels.queue())
            .handle(this.httpOutboundAdapter()
            .transform(Transformers.toJson())
            .log(Level.DEBUG, "trace.http",
                    "'Response.\n'"+
                    ".concat('Headers : ').concat(headers.toString()).concat('\n')"+
                    ".concat('Payload : ').concat(payload.toString())"
                )
            .get();
}

    @Bean 
public IntegrationFlow errorFlow(){
    return IntegrationFlows.from(errorChannel())                                                                
                            .log(Level.DEBUG,"trace.http", "'Ocurred an error in httpResponse :'.concat(payload.message)")
                            .transform("payload.failedMessage")                             
                            .handle((p,h) -> 
                                        MessageBuilder.withPayload(new GenericMessage<>(p,h)))
                            .transform(Transformers.toJson())
                            .enrichHeaders(c -> c.headerExpression(FileHeaders.FILENAME, "'emailErrors-'.concat(headers.getTimestamp()).concat('.json')"))
                            .handle(fileOutboundAdapter())                              
                            .get();
}

日志打印：

postfnd（sent = true）在通道'errorChannel'上，消息：ErrorMessage [payload = org.springframework.messaging.MessagingException：Dispatcher无法传递消息;嵌套异常是org.springframework.messaging.core.DestinationResolutionException：没有输出通道或replyChannel标头可用，headers = {id = 826074c0-d1c6-4ecf-44f0-6da697b29f9c，timestamp = 1484650523378}]

Gary Russel消化后的更新

...

@Bean
public IntegrationFlow send(){  
    return IntegrationFlows.from("service.input")
            .log(Level.DEBUG, "trace.http",
                    "'Request.\n'"+
                    ".concat('Headers : ').concat(headers.toString()).concat('\n')"+
                    ".concat('Payload : ').concat(payload.toString())"
                )                               
            .channel(MessageChannels.queue())
            .handle(this.httpOutboundAdapter()
            .transform(Transformers.toJson())
            .log(Level.DEBUG, "trace.http",
                    "'Response.\n'"+
                    ".concat('Headers : ').concat(headers.toString()).concat('\n')"+
                    ".concat('Payload : ').concat(payload.toString())"
                )
            .channel("nullChanel")
            .get();
}

日志

2017-01-17 13：58：31.929 DEBUG 19702 --- [ask-scheduler-9] osintegration.channel.DirectChannel：preSend on channel'send.channel＃3'，message：GenericMessage [payload = $ PAYLOAD_JSON，headers = $ HEADERS] 2017-01-17 13：58：31.930 DEBUG 19702 --- [ask-scheduler-9] ositMessageTransformingHandler：org.springframework.integration.transformer.MessageTransformingHandler＃0收到消息：GenericMessage [payload = $ PAYLOAD_JSON，headers = $ HEADERS ] 2017-01-17 13：58：31.932 DEBUG 19702 --- [ask-scheduler-9] osintegration.channel.DirectChannel：preSend on channel'send.channel＃5'，message：GenericMessage [payload = $ PAYLOAD_JSON，headers = $ HEADERS] 2017-01-17 13：58：31.932 DEBUG 19702 --- [ask-scheduler-9] osintegration.handler.LoggingHandler：org.springframework.integration.handler.LoggingHandler＃1收到消息：GenericMessage GenericMessage [payload = $ PAYLOAD_JSON ，headers = $ HEADERS] 2017-01-17 13：58：31.942 DEBUG 19702 --- [ask-scheduler-9] osintegration.handler.BridgeHandler：org.springframework.integration.handler.BridgeHandler＃2收到消息：GenericMessage [payload = $ PAYLOAD_JSON，标题= $ HEADERS] 2017-01-17 13：58：31.943 DEBUG 19702 --- [ask-scheduler-9] o.s.integration.channel.DirectChannel：preSend on channel'nullChanel'，message：GenericMessage [payload = $ PAYLOAD_JSON，headers = $ HEADERS] 2017-01-17 13：58：31.944 DEBUG 19702 --- [ask-scheduler-9] osintegration.channel.DirectChannel：preSend on channel'errorChannel'，message：ErrorMessage [payload = org.springframework.messaging.MessageDeliveryException： Dispatcher没有渠道'申请的订阅者：29891.nullChanel'。嵌套异常是org.springframework.integration.MessageDispatchingException：Dispatcher没有订阅者，headers = {id = fe0672cd-b9e4-9d43-2c5a-3d2d0a1c5493，timestamp = 1484668711944}] 2017-01-17 13：58：31.945 DEBUG 19702 --- [ask-scheduler-9] osintegration.handler.LoggingHandler：org.springframework.integration.handler.LoggingHandler＃2收到消息：ErrorMessage [payload = org.springframework .messaging.MessageDeliveryException：Dispatcher没有通道'application：29891.nullChanel'的订阅者。嵌套异常是org.springframework.integration.MessageDispatchingException：Dispatcher没有订阅者，headers = {id = fe0672cd-b9e4-9d43-2c5a-3d2d0a1c5493，timestamp = 1484668711944}] 2017-01-17 13：58：31.949 DEBUG 19702 --- [ask-scheduler-9] ositMessageTransformingHandler：org.springframework.integration.transformer.MessageTransformingHandler＃1收到消息：ErrorMessage [payload = org.springframework.messaging.MessageDeliveryException ：Dispatcher没有订阅者的频道申请：29891.nullChanel'。;嵌套异常是org.springframework.integration.MessageDispatchingException： Dispatcher没有订阅者，headers = {id = fe0672cd-b9e4-9d43-2c5a-3d2d0a1c5493，timestamp = 1484668711944}] 2017-01-17 13：58：31.951 DEBUG 19702 --- [ask-scheduler-9] osintegration.channel.DirectChannel：preSend on channel'errorFlow.channel＃1'，message：GenericMessage [payload = $ PAYLOAD_JSON，headers = $ HEADERS]

我分别用$ PAYLOAD_JSON和$ HEADERS替换了有效负载和标头以减少日志。

Answer 1

您的网关有void返回void send(...)，因此框架不会期待回复。

.log()元素是窃听（这是第一个日志让消息流到队列通道的方式）。

由于您的流程以日志（wireTap）结束，因此需要消息的消费者或回复频道。

我们可能会制作一个最终的.log终端，并会查看（INT-4210），但现在您可以在最后.channel("nullChannel")之后添加.log。

HttpRequestExecutingMessageHandler：没有可用的输出通道或replyChannel标头

1 个答案: