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From Claus Ibsen <>
Subject Re: Retry Processing
Date Tue, 13 Apr 2010 17:17:01 GMT

A JMS Broker often also have a redelivery mechanism which you can leverage.
For example Apache ActiveMQ have a dead letter queue etc.

Camel error handler is also capable of redelivery and dead letter
channel and whatnot.
You can use it to detect that the redelivery have exhausted and then
send an email about this failure.
You can also stop routes using the Camel API.

But restarting it automatic after 30 min is most likely more easier
using RoutePolicy where you can have custom code control the route at

The camel webpage have a search box where you can enter some key words
to see if you can find any good links.

Also the Camel in Action books cover extensively Error Handling in
chapter 5. And in chapter 13 you can read about managing routes at
runtime, eg dynamic starting and stopping routes etc.

On Tue, Apr 13, 2010 at 9:21 AM, PatrickVB <> wrote:
> Hi all,
> I want to implement the following functionality....
> The system received an xml message on a queue. The message contains
> references to files for your information.
> This message is then forwarded to a processor which is responsible for
> performing extraction (unzipping, unrarring,...) of the references files.
> After the processor has finished a new xml message must be put on a queue
> again, containing the result of the extraction process.
> Now the problem I can see here, is that this extraction processing can run
> out of disk space. In that case an email message should be send to an
> administrator and the extraction should be retried at some later time (lets
> say 30 minutes later)
> I was hoping that I could implement this kind of retry logic using camel. I
> sat that there is the dead-letter-channel stuff, where you can specify
> number of redeliveries etc... I do however not know if this dead-letter
> stuff is applicable to processors as well or only to endpoints.
> Any information on how I could implement this (references, pieces of code
> etc...) would be very much appreciated, since I'm a complete newbie to
> Camel.
> Many thanks
> Patrick
> --
> View this message in context:
> Sent from the Camel - Users mailing list archive at

Claus Ibsen
Apache Camel Committer

Author of Camel in Action:
Open Source Integration:

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