Re: Trying to understand how to deal with process() errors and creating an exceptionChannel for bad messages.

Wed, 24 Sep 2008 20:24:33 -0700

Can you take a look at the below unit test, the message is only sent to the "mock:fail" endpoint when the exception is thrown. 

Willem Jiang wrote:

Hi
You don't need to call the exchange.isFailed(), it just check if the exchange's fault message or exception is set. Here is a Unit test of DeadLetterChannel[1], which shows what you want. Please check it out.
[1] https://svn.apache.org/repos/asf/activemq/camel/trunk/camel-core/src/test/java/org/apache/camel/processor/DeadLetterChannelTest.java 

Willem

Mick Knutson wrote:

To give some background here is my process:

    *public void process(Exchange exchange)
            throws Exception {
        log.info("process ChangeRequestInputTransformer request");

        String body = (String) exchange.getIn().getBody();

        // Get a Map of Items from the input message
        JSONObject jsonIn = new JSONObject(body);
// validate input message, route to verifyErrorEndpoint if there are 
errors.
        String customerId = jsonIn.getString(Constants.CUSTOMER_ID);
        String type = jsonIn.getString(Constants.CHANGEREQUST_TYPE);
        String quota = jsonIn.getString(Constants.QUOTA);

        ChangeRequest changeRequest = null;

        try {

            if (type.equalsIgnoreCase(Constants.PROVISION)) {
                log.info("***** PROVISION *****");
                changeRequest = createProvisionChangeRequest(customerId,
quota); // can throw Exception
exchange.getOut().setHeader(Constants.REQUEST_DESTINATION, 
Constants.REQUEST_OUTPUT_CHANNEL);

            } else if (type.equalsIgnoreCase(Constants.DEPROVISION)) {
                log.info("DEPROVISION");
            } else {
                log.error("Invalid Change Request");
exchange.getOut().setHeader(Constants.REQUEST_DESTINATION, 
Constants.REQUEST_INPUT_ERROR_CHANNEL);
            }

            String jsonOut = toJSON(body);
exchange.getOut().setMessageId(changeRequest.getChangeRequestId() 
+ "");
            exchange.getOut().setHeader(Constants.CORRELATION_ID,
changeRequest.getChangeRequestId());
            exchange.getOut().setHeader(Constants.TIMEOUT, new
Integer(5000)); // fixme: 5 seconds....
            exchange.getOut().setHeader(Constants.CUSTOMER_ID,
changeRequest.getCustomerId());

            exchange.getOut().setBody(jsonOut);

            //todo need to rout to CR_INPUT_ERROR_CHANNEL if there is an
error.

            log.info("*********************************");
        } catch (Exception e) {
            exchange.isFailed();
            throw new Exception("Error creating Change Request");
        }
    }
*

Now, I get an exception with
*exchange.getOut().setMessageId(changeRequest.getChangeRequestId()
+ ""); *but my mock still gets the expected number of messages.
so I need to understand how to stop the current message, and redirect this 
to an error channel instead.
On Tue, Sep 23, 2008 at 1:50 PM, Mick Knutson <[EMAIL PROTECTED]>wrote: 


I have input messages that I am trying to process, and when there is an
error, I want to create a new exceptionMessage and put it onto an
inputErrorChannel .



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Thank You…

Mick Knutson
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(415) 354-4215

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