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  1. Camel
  2. CAMEL-1581

ClassCastException when using camel-cxf and camel-jms in the InOut same flow

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 1.5.0, 1.6.0
    • 1.6.1
    • None
    • None

    Description

      As per thread on FUSE forum http://fusesource.com/forums/thread.jspa?threadID=834&tstart=0:

      [[
      I have a camel route that listens on a CXFEndpoint (for MESSAGE data as DOMSource) and routes the message to a JMS queue. Something like:

      <route>
      <from uri="cxf:bean:passportRequestWS?dataFormat=MESSAGE"/>
      <to uri="soapProcessor"/>
      <convertBodyTo type="java.lang.String"/>
      <to uri="activemq:queue:blah"/>
      <convertBodyTo type="javax.xml.transform.dom.DOMSource"/>
      </route>

      My understanding is that the JMS producer will realize that the exchange is InOut, create a temporary queue for the response, and then wait for the response to arrive on the temporary queue before sending the original CXFExchange on along the pipeline. Indeed, this is what I observe! However, I?ve discovered a little nasty.

      When the JMSProducer gets in the incoming message, it sets the Out message of the original CXFExchange to a JmsMessage. Then, the pipeline processor calls exchange.getOut on the CXFExchange and BANG! we get a class-cast exception. Turns out that the CXFExchange.getOut() method always casts the message to a CxfMessage. Ouch. Surely this means then that camel-cxf can?t talk to any producer that does not produce a CXFMessage - very limiting.
      ]]

      The response on the form from davsclaus was:

      [[
      Well spotted.

      If just the damn Exchange was final so we had one implementation of it. But I guess we have to thank Java generics for that so the first API had generics for per component.

      Could you create a ticket in JIRA for this?

      As a workaround you can add a processor where you have full access to the Exchange so you can set a CxfMessage as the payload.
      ]]

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            njiang Willem Jiang
            njiang Willem Jiang
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              Created:
              Updated:
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