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From "Raul Kripalani (JIRA)" <>
Subject [jira] [Created] (CAMEL-5464) camel-jms consumer doesn't send back a reply in all cases
Date Tue, 24 Jul 2012 13:02:34 GMT
Raul Kripalani created CAMEL-5464:

             Summary: camel-jms consumer doesn't send back a reply in all cases
                 Key: CAMEL-5464
             Project: Camel
          Issue Type: Bug
          Components: camel-activemq, camel-jms
    Affects Versions: 2.10.0, 2.9.2, 2.8.6
            Reporter: Raul Kripalani
             Fix For: 2.10.1

In a very simple route consuming from a Camel JMS endpoint receiving InOut exchanges (i.e.
JMSReplyTo header present), the endpoint will not send back replies.

This happens because Camel JMS only returns a reply if the OUT message is set. But if the
route looks like: consumer => processor, and Camel doesn't find the need to "weave in"
an implicit Pipeline processor, no one will implicitly take care of mapping the IN message
to an OUT message (unless the user knows about these internal aspects - but we shouldn't expect
them too).

As a result, these routes DON'T WORK...

   <from uri="timer:foo?fixedRate=true&amp;period=10000" />
   <setBody><constant>Hello Raul</constant></setBody>
   <to uri="log:SendingRequest?showAll=true" />
   <inOut uri="activemq:queue:test1?requestTimeout=1000" />
   <to uri="log:ReceivedReply?showAll=true" />
   <from uri="activemq:queue:test1" />
   <to uri="log:ReceivedRequest?showAll=true" />

... but just by adding an additional log endpoint to the second route (or any other thing,
for that matter), it starts to work because Camel weaves in the Pipeline processor.

Other workarounds that work:
* explicitly wrapping the log endpoint in a <pipeline> DSL
* <setBody><simple>${in.body}</simple></setBody>

Or simply introducing anything that will force Camel to insert a Pipeline processor.

IMHO, there are two solutions to avoid this issue:
# Always weave in a Pipeline processor (adds overhead in simple routes and may cause regressions)
# Adapt EndpointMessageListener to pick the IN message when the exchange is out capable and
expectation of a reply exists

I'm happy to work on a patch for Camel 2.10.1.

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