MessageDeliveryException: Dispatcher has no subscribers

[rossgard]

Hi,

I am getting an error message when using the imap-idle-channel-adapter.

I am getting this error message:

DEBUG: org.springframework.integration.mail.ImapIdleChannelAdapter - received 15 mail messages
DEBUG: org.springframework.integration.channel.DirectChannel - preSend on channel 'mailInputChannel', message: [Payload=javax.mail.internet.MimeMessage@922804][Headers={springintegration_id=74a7e293-7255-4ceb-adff-0f87be7f1753, springintegration_timestamp=1257936337453}]
Exception in thread "SimpleAsyncTaskExecutor-1" org.springframework.integration.message.MessageDeliveryException: Dispatcher has no subscribers.
                at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:97)
                at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:90)
                at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:43)
                at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:116)
                at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:94)
                at org.springframework.integration.channel.MessageChannelTemplate.doSend(MessageChannelTemplate.java:223)
                at org.springframework.integration.channel.MessageChannelTemplate.send(MessageChannelTemplate.java:180)
                at org.springframework.integration.endpoint.MessageProducerSupport.sendMessage(MessageProducerSupport.java:51)
                at org.springframework.integration.mail.ImapIdleChannelAdapter.access$2(ImapIdleChannelAdapter.java:1)
                at org.springframework.integration.mail.ImapIdleChannelAdapter$IdleTask.run(ImapIdleChannelAdapter.java:125)
                at java.lang.Thread.run(Thread.java:595)

As far as I know the error message says that nothing listens on the mailInputChannel, but I can´t find the error.

My configuration:

<si-mail:imap-idle-channel-adapter id="mailin"
                               store-uri="imap://*** imap uri here ***" channel="mailInputChannel" should-delete-messages="false"
                               java-mail-properties="mailProperties"/>
 
                <util:properties id="mailProperties">
                               <beans:prop key="mail.debug">true</beans:prop>
                </util:properties>
 
                <si:channel id="mailInputChannel" />
 
                <si:service-activator input-channel="mailInputChannel" method="handleMessage">
                               <beans:bean class="org.test.activator.mail.MailServiceActivator" />
                </si:service-activator>

Service Activator:

public class MailServiceActivator {
 
    public void handleMessage(MimeMessage message) {
        logger.debug("Activator called with message: " + message);
    }
}

Test:

public class MailIntegration {
   
    public static void main(String[] args) {
        AbstractApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"/integration-mail-beans.xml"}, MailIntegration.class);
        applicationContext.stop();
    }
}

When I run the code without the imap-adapter all works fine. The service activator reads messages from the mailInputChannel.

I have tried with annotations and without annotations, but without luck.

I am using Spring Integration 1.0.3-RELEASE.

Any pointers?

[oleg.zhurakousky]

Are you sure you have nothing else configured?
I just ran your config and it works just fine.
Oleg

[rossgard]

Are you sure you have nothing else configured?
I just ran your config and it works just fine.
Oleg

Ok, thanks!
I don`t think that I have anything else configured. I`ll check.

Kurt

[rossgard]

I have tested with a clean project now and I still experience the same error message. I have also checked that I am using the required dependencies for spring integration 1.0.3.RELEASE. It's a puzzle

I will try the 2.0 Milestone release.

[Mark Fisher]

It might be related to this issue that was resolved in 2.0 M1:
http://jira.springframework.org/browse/INT-845

If not, then we need to take a look at it, since that same issue could apply here (ordering of startup) even though the imap-idle adapter is itself event-driven.

Please let us know if it works ok with 2.0 M1, and if not, can you please open a new issue?

Thanks,
Mark

[rossgard]

It does not work with 2.0 M1 either. I get the same error message.

Issue opened: http://jira.springframework.org/browse/INT-884

[Mark Fisher]

Thank you.

By the way, as a workaround you should be able to set auto-startup="false" on the adapter, and then start() it manually in some code that is invoked later (e.g. a custom ApplicationListener reacting to a ContextRefreshedEvent should do the trick).

[rossgard]

Hi again, and thanks for the follow up!

It works after I added the custom ApplicationListener and removed stop() from the test code.

[r1c4r60]

public class MailIntegration {
   
    public static void main(String[] args) {
        AbstractApplicationContext applicationContext = new ClassPathXmlApplicationContext(new String[]{"/integration-mail-beans.xml"}, MailIntegration.class);
        applicationContext.stop();
    }
}

The only thing that needs to be done in order to run this example is:

REMOVE THE "applicationContext.stop()" because in that point you are loosing all references to the pre instantiated beans (handlers) therefore

Dispatcher has no subscribers.

. All handlers are already null when the message event happens.

[Mark Fisher]

Kurt,

Can you please try this with the *trunk* version? We're now relying on some enhancements to the lifecycle processing in Spring 3.0 which includes ordered shutdown. I would like to know if that may have resolved the issue.

Thanks,
Mark