You can use onWhen on an onException where the onWhen is a predicate
to determine if that onException should trigger or not.

Some details here

If you have a copy of Camel in Action book this is covered much more
in details in that book, as it has a full chapter on error handling.

On Tue, Oct 18, 2016 at 10:38 AM, Shabin5785 <> wrote:
> I have a route that calls an external rest service. I have configured my
> error handler as shown below.
> errorHandler(deadLetterChannel("jms:dlc").maximumRedeliveries(3));
> What i want to do:
> 1) If connection to external api fails, i want to retry 3 times and then
> send to deadLetterChannel
> 2) If api call is fine, i want to check the status code, log the response
> and then send the message to deadLetterChannel.
> For that i set throwExceptionOnFailure to false.
> In my route i have a bean as the last endpoint. This bean receives the
> response from the external end point and checks for the status.
> void process(Exchange exchange){
>   //check http status code
>   //if not success
>   exchange.setProperty(Exchange.ROUTE_STOP,true);
>   //sendToDeadLetterQueue;
>   }
> My problem is that redelivery happens even when i am able to connect to API.
> I expect the redelivery to happen on error. I am handling the response from
> API and also stopping the exchange. So i expect my Bean to log the response
> from API, send to deadLetterQueue(I have a route for that) and stop. But
> redelivery happens 3 times evand so en when API call is successful and so
> deadletterchannel route is invoked 3 times
> Can i stop the redelivery from my bean?
> --
> View this message in context: 
> Sent from the Camel - Users mailing list archive at

Claus Ibsen
----------------- @davsclaus
Camel in Action 2:

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