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https://camel.apache.org/components/latest/eips/dead-letter-channel.html
Prior to Camel 2.10, Camel will perform redelivery while stopping a route, or shutting down Camel. This has improved a bit in Camel 2.10 onwards, as Camel will not perform redelivery attempts when shutting down aggressively (eg during Graceful Shutdown and timeout hit).
https://stackoverflow.com/questions/30580825/how-to-have-both-original-message-and-redelivery-counter-in-a-camel-dead-letter
I tried to access the number of redeliveries in the message header Exchange.REDELIVERY_COUNTER, but it is always null when the message reaches the deadLetterService bean. I do understand that is so because original message do not have this header information.
http://people.apache.org/~dkulp/camel/dead-letter-channel.html
The maximum redeliveries is the number of re delivery attempts. By default Camel will try to process the exchange 1 + 5 times. 1 time for the normal attempt and then 5 attempts as redeliveries. Setting the maximumRedeliveries to a negative value such as -1 will then always redelivery (unlimited).
https://camel.apache.org/manual/latest/faq/how-do-i-retry-processing-a-message-from-a-certain-point-back-or-an-entire-route.html
By default Apache Camel will perform any redelivery (retry) attempts from the point of failure. So if you want to retry from a point before this, you would need to split up your route.
https://cwiki.apache.org/confluence/display/CAMEL/Dead+Letter+Channel
Before Camel 2.10, Camel would perform redelivery while stopping a route, or shutting down Camel. This has improved a bit in Camel 2.10 : Camel will no longer perform redelivery attempts when shutting down aggressively, e.g., during Graceful Shutdown and timeout hit.
https://medium.com/@mzimecki/how-to-test-apache-camel-jms-routes-with-spring-and-activemq-step-by-step-f429760074e6
May 28, 2017 · The header keeps redelivery counter. If the counter reached the maximum number of redelivery attempts, we are stopping the route, otherwise we are incrementing the counter. We must set the counter to zero in the header just before sending the message for the first time.
http://people.apache.org/~dkulp/camel/redeliverypolicy.html
Using RedeliveryPolicyProfiles. Available as of Camel 2.7. In the XML snippet below we have defined a <redeliveryPolicyProfile> which we can refer to from the <errorHandler>.
https://people.apache.org/~dkulp/camel/exception-clause.html
It can be used to add some customer header or whatnot. In Camel 2.0 we have added this feature to Exception Clause as well, so you can use per exception scoped on redelivery. Camel will fallback to use the one defined on Dead Letter Channel if any, if none exists on the Exception Clause. See Dead Letter Channel for more details on onRedelivery.
http://www.davsclaus.com/2012/02/correlating-logs-from-redelivered.html
Apache Camel handles redelivery of messages based on two principles - internally - externally The internal redelivery is essentially the Camel error handler, that allows you to retry processing a failed message. This is all handled by Camel itself.
https://camel.apache.org/components/latest/jms-component.html
camel.component.jms.wait-for-provision-correlation-to-be-updated-counter Number of times to wait for provisional correlation id to be updated to the actual correlation id when doing request/reply over JMS and when the option useMessageIDAsCorrelationID is enabled.
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