Spring Integration DSL 错误处理

Question

正如标题所示，我正在寻找有关 DSL 流中错误处理的好示例。具体来说，我正在寻找处理来自服务激活器的错误。

示例:

IntegrationFlows.from(Amqp.inboundAdapter(simpleMessageListenerContainer()))
    .transform(new JsonToObjectTransformer(AlbumDescriptor.class))
    .handle(AlbumDescriptor.class, (p,h) -> transformXml(p))
    .transform(new ObjectToJsonTransformer())
    .handle(Amqp.outboundAdapter(rabbitTemplate).routingKey("xml-transformed"))
    .get();

如果我的函数 transformXml(p) 抛出异常，我该如何让它转到特定的 errorChannel。

如果没有抛出异常，一切都会按照我想要的方式进行。

目前，如果从此函数引发异常，我会收到以下异常:

2014-09-17 15:26:28.566  WARN 16339 --- [cTaskExecutor-1] s.a.r.l.ConditionalRejectingErrorHandler : Execution of Rabbit message listener failed.

org.springframework.amqp.rabbit.listener.ListenerExecutionFailedException: Listener threw exception
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:758)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:653)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:576)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:78)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:161)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1177)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:559)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:950)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:934)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$600(SimpleMessageListenerContainer.java:78)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1045)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.messaging.MessageHandlingException: java.lang.reflect.InvocationTargetException
    at org.springframework.integration.dsl.LambdaMessageProcessor.processMessage(LambdaMessageProcessor.java:125)
    at org.springframework.integration.handler.ServiceActivatingHandler.handleRequestMessage(ServiceActivatingHandler.java:71)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:170)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:255)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:223)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:109)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:44)
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:94)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.sendMessage(AbstractReplyProducingMessageHandler.java:260)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.sendReplyMessage(AbstractReplyProducingMessageHandler.java:241)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.produceReply(AbstractReplyProducingMessageHandler.java:205)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleResult(AbstractReplyProducingMessageHandler.java:199)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:177)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:255)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:223)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:109)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:44)
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:94)
    at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:98)
    at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter.access$400(AmqpInboundChannelAdapter.java:44)
    at org.springframework.integration.amqp.inbound.AmqpInboundChannelAdapter$1.onMessage(AmqpInboundChannelAdapter.java:90)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:650)
    ... 10 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
    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.springframework.integration.dsl.LambdaMessageProcessor.processMessage(LambdaMessageProcessor.java:122)
    ... 41 common frames omitted
Caused by: com.amazonaws.services.s3.model.AmazonS3Exception: The specified key does not exist. (Service: Amazon S3; Status Code: 404; Error Code: NoSuchKey; Request ID: 7029FF03D01CFB95)
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:1053)
    at com.amazonaws.http.AmazonHttpClient.executeOneRequest(AmazonHttpClient.java:662)
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:428)
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:290)
    at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3655)
    at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1132)
    at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1004)
    at com.emusic.indiegestion.integration.flows.AlbumTransformFlowConfig.transformXml(AlbumTransformFlowConfig.java:67)
    at com.emusic.indiegestion.integration.flows.AlbumTransformFlowConfig.lambda$0(AlbumTransformFlowConfig.java:49)
    at com.emusic.indiegestion.integration.flows.AlbumTransformFlowConfig$$Lambda$1/2142893855.handle(Unknown Source)
    ... 46 common frames omitted

Answer 1

实际上，无论是 DSL 还是原始 XML Spring Integration 配置，都没有区别。

Amqp.inboundAdapter()提供.errorChannel()选项以及 <amqp:inbound-channel-adapter>提供error-channel属性。

正如我在手册中所说，DSL 的作用与所有其他 Spring Integration 配置变体相同。所以，Error Handling这里也一样。

有关此事的更多信息:http://docs.spring.io/spring-integration/docs/latest-ga/reference/html/configuration.html#namespace-errorhandler