error in DeadLetterChannel propagated to source

[Josef Ludvíček]

Hello camel users,

I'd like to ask you for your opinion on following DeadLetter channel example. 
Is it bug, feature or I'm missing something?

I create route with DeadLetter error handler. 
On error message goes to route "dead-letter-route".
 - use case: format some meaningfull description of problem and send e-mail to 
admin or 
whatever
 - there is LoggingErrorHandler for dead-letter-route route -if sending mail / 
templating / 
whatever fails, I need to know what happend, maby try redelivery.


In following example:
 - new e-mail in source-route
 - http post fails 
 - message is moved to dead-letter-route
 - http post in dead-letter-route fails
 - I expect error to be logged and it should be end of story BUT
 - error is propagated back to source-route and to imap endpoint, which results 
to e-mail being 
marked as unread => inifnite loop. Shouldn't dead letter channel in original 
route prevent such 
situations?

Tried with camel 2.12.0 and 2.13.0. 

Thanks for opinion.

Josef


--- spring xml --- dependencies: camel-mail, camel-http4
------------------------------------------

<camel:camelContext xmlns="http://camel.apache.org/schema/spring";>


        <camel:errorHandler id="source-route-eh" type="DeadLetterChannel" 
deadLetterUri="direct:dead">
            <camel:redeliveryPolicy maximumRedeliveries="2" 
logStackTrace="false"
                                    logRetryAttempted="true" 
logExhausted="true" 
retryAttemptedLogLevel="WARN"
                                    retriesExhaustedLogLevel="ERROR"/>
        </camel:errorHandler>


        <camel:errorHandler id="logging-dead-route" type="LoggingErrorHandler">
            <camel:redeliveryPolicy maximumRedeliveries="1"
                                    logRetryAttempted="true" 
logExhausted="true" 
retryAttemptedLogLevel="WARN"
                                    retriesExhaustedLogLevel="ERROR" 
logStackTrace="false"/>
        </camel:errorHandler>

        <camel:route id="source-route" errorHandlerRef="source-route-eh">
            <camel:from 
uri="imaps:user_lo...@imap.gmail.com?password=USER_PASSWORD&amp;consumer.delay=
1000"/>
            <!--<camel:from uri="quartz2:tests/test?trigger.repeatCount=0"/>-->
            <camel:to uri="http4://localhost:666/nonexistinguri"/>
        </camel:route>

        <camel:route id="dead-letter-route" 
errorHandlerRef="logging-dead-route">
            <camel:from uri="direct:dead"/>
            <camel:log message="message in dead letter queue"/>
            <camel:to uri="http4://localhost:667/deadnonexistinguri"/>
        </camel:route>

    </camel:camelContext>
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