DestinationResolutionException: no output-channel or replyChannel header available - spring

Question

I am implementing a flow where using a MongoDbMessageSource I get a list of users and I want to process each document in parallel. For this I use the default behavior of Split.
But the following error occurs after the split:
o.s.i.channel.PublishSubscribeChannel : preSend on channel 'errorChannel', message: ErrorMessage [payload=org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available, failedMessage=GenericMessage [payload=UserEntity{id=5974dfe53681ac160c78dc0f, firstName=David, lastName=García, age=14, socialMedia=[]}, headers={sequenceNumber=4, correlationId=8f8f7b7a-832a-8942-1922-26b6a7529091, id=bb373e42-d59c-42e6-d221-68bf1f56fec3, mongo_collectionName=users, sequenceSize=5, timestamp=1500831727759}], headers={id=9187ffcd-8c79-eb1e-8791-1cfe558ab134, timestamp=1500831727762}]
The code is as follows:
#Configuration
#IntegrationComponentScan
public class InfrastructureConfiguration {
private static Logger logger = LoggerFactory.getLogger(InfrastructureConfiguration.class);
/**
* The Pollers builder factory can be used to configure common bean definitions or
* those created from IntegrationFlowBuilder EIP-methods
*/
#Bean(name = PollerMetadata.DEFAULT_POLLER)
public PollerMetadata poller() {
return Pollers.fixedDelay(10, TimeUnit.SECONDS).get();
}
#Bean
public TaskExecutor taskExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(5);
executor.setMaxPoolSize(10);
executor.setQueueCapacity(25);
return executor;
}
/**
*
* MongoDbMessageSource is an instance of MessageSource which returns a Message with a payload
* which is the result of execution of a Query
*/
#Bean
#Autowired
public MessageSource<Object> mongoMessageSource(MongoDbFactory mongo) {
MongoDbMessageSource messageSource = new MongoDbMessageSource(mongo, new LiteralExpression("{}"));
messageSource.setExpectSingleResult(false);
messageSource.setEntityClass(UserEntity.class);
messageSource.setCollectionNameExpression(new LiteralExpression("users"));
return messageSource;
}
#Bean
public DirectChannel inputChannel() {
return new DirectChannel();
}
#Bean
#Autowired
public IntegrationFlow processUsers(MongoDbFactory mongo, PollerMetadata poller) {
return IntegrationFlows.from(mongoMessageSource(mongo), c -> c.poller(poller))
.split()
.channel(MessageChannels.executor("executorChannel", this.taskExecutor()))
.handle((GenericHandler<UserEntity>) (payload, headers) -> {
logger.debug("user:" + payload + " on thread "
+ Thread.currentThread().getName());
return payload;
})
.aggregate()
.get();
}
}
Does anyone know I'm doing wrong? Thanks in advance.
Use MessageHandler as suggested Barath:
#Bean
#Autowired
public IntegrationFlow processUsers(MongoDbFactory mongo, PollerMetadata poller) {
return IntegrationFlows.from(mongoMessageSource(mongo), c -> c.poller(poller))
.split()
.channel(MessageChannels.executor("executorChannel", this.taskExecutor()))
.wireTap(sf -> sf.handle(user -> logger.debug("user:" + user.getPayload().toString() + " on thread " + Thread.currentThread().getName())))
.aggregate()
.get();
}
The error persists, the complete trace of the error I put below:
2017-07-23 21:46:36.785 DEBUG 15148 --- [ taskExecutor-4] o.s.integration.handler.LoggingHandler : _org.springframework.integration.errorLogger.handler received message: ErrorMessage [payload=org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available, failedMessage=GenericMessage [payload=UserEntity{id=5974fd123681ac3b2c5c343a, firstName=David, lastName=García, age=14, socialMedia=[]}, headers={sequenceNumber=4, correlationId=da7be297-992b-8f5a-d41c-58a89e654fcc, id=eb55d6bf-8108-4be5-8b32-6260d4ceea9b, mongo_collectionName=users, sequenceSize=5, timestamp=1500839196770}], headers={id=83a833cd-ac87-f6be-fb75-8d6907e3d194, timestamp=1500839196784}]
2017-07-23 21:46:36.788 ERROR 15148 --- [ taskExecutor-4] o.s.integration.handler.LoggingHandler : org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available, failedMessage=GenericMessage [payload=UserEntity{id=5974fd123681ac3b2c5c343a, firstName=David, lastName=García, age=14, socialMedia=[]}, headers={sequenceNumber=4, correlationId=da7be297-992b-8f5a-d41c-58a89e654fcc, id=eb55d6bf-8108-4be5-8b32-6260d4ceea9b, mongo_collectionName=users, sequenceSize=5, timestamp=1500839196770}]
at org.springframework.integration.dispatcher.AbstractDispatcher.wrapExceptionIfNecessary(AbstractDispatcher.java:133)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:120)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
at org.springframework.integration.dispatcher.UnicastingDispatcher.access$000(UnicastingDispatcher.java:53)
at org.springframework.integration.dispatcher.UnicastingDispatcher$3.run(UnicastingDispatcher.java:129)
at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:55)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutput(AbstractMessageProducingHandler.java:353)
at org.springframework.integration.handler.AbstractMessageProducingHandler.produceOutput(AbstractMessageProducingHandler.java:269)
at org.springframework.integration.handler.AbstractMessageProducingHandler.sendOutputs(AbstractMessageProducingHandler.java:186)
at org.springframework.integration.aggregator.AbstractCorrelatingMessageHandler.completeGroup(AbstractCorrelatingMessageHandler.java:671)
at org.springframework.integration.aggregator.AbstractCorrelatingMessageHandler.handleMessageInternal(AbstractCorrelatingMessageHandler.java:418)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:127)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
... 7 more
2017-07-23 21:46:36.788 DEBUG 15148 --- [ taskExecutor-4] o.s.i.channel.PublishSubscribeChannel : postSend (sent=true) on channel 'errorChannel', message: ErrorMessage [payload=org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available, failedMessage=GenericMessage [payload=UserEntity{id=5974fd123681ac3b2c5c343a, firstName=David, lastName=García, age=14, socialMedia=[]}, headers={sequenceNumber=4, correlationId=da7be297-992b-8f5a-d41c-58a89e654fcc, id=eb55d6bf-8108-4be5-8b32-6260d4ceea9b, mongo_collectionName=users, sequenceSize=5, timestamp=1500839196770}], headers={id=83a833cd-ac87-f6be-fb75-8d6907e3d194, timestamp=1500839196784}]

Answer 1

Your problem that Aggregator is request-reply component, but you don't have anything after that in your flow. That's why you have that error. You have to decide what to do with the aggregator result.