About moving Exchange to dead letter queue and using the original message - 6.3

Talend ESB Mediation Developer Guide

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6.3
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Talend Data Fabric
Talend Data Services Platform
Talend ESB
Talend MDM Platform
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task
Design and Development
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Talend ESB

The option useOriginalMessage is used for routing the original input message instead of the current message that potentially is modified during routing.

For instance if you have this route:

from("jms:queue:order:input")
   .to("bean:validateOrder")
   .to("bean:transformOrder")
   .to("bean:handleOrder");

The route listen for JMS messages and validates, transforms and handle it. During this the Exchange payload is transformed/modified. So in case something goes wrong and we want to move the message to another JMS destination, then we can configure our Dead Letter Channel with the useOriginalBody option. But when we move the Exchange to this destination we do not know in which state the message is in. Did the error happen in before the transformOrder or after? So to be sure we want to move the original input message we received from jms:queue:order:input. So we can do this by enabling the useOriginalMessage option as shown below:

// will use original body
errorHandler(deadLetterChannel("jms:queue:dead")
   .useOriginalMessage().mamimumRedeliveries(5).redeliverDelay(5000);

Then the messages routed to the jms:queue:dead is the original input. If we want to manually retry we can move the JMS message from the failed to the input queue, with no problem as the message is the same as the original we received.