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From Valdis Andersons <valdis.anders...@vhi.ie>
Subject RE: DeadLetterChannel handle option
Date Wed, 06 Mar 2019 16:24:12 GMT
Hey,

That's pretty much how I would understand it was well. Though I'm not setting the handled
option explicitly anywhere in my route builders. To make the exchange go somewhere else in
case of an exception you'd really just have to specify the deadLetterChannel in the errorHandler
of your route builder:

errorHandler(deadLetterChannel(deadLetterQueue));

Optionally you can also define a retry strategy on some exceptions while not on others:

onException(RecoverableException.class)
					.maximumRedeliveries(redeliverable.maximumRedeliveries())
					.redeliveryDelay(redeliverable.redeliveryDelay())
					.logExhaustedMessageHistory(true)
					.retryAttemptedLogLevel(LoggingLevel.WARN)
					.useOriginalMessage();

Or whatever fits your use case and requirements.

To get the log output for an exception that isn't specified for the retry (in the onException
configuration) I had to configure my logging properties this way:

logging:
    level:
        org:
            apache:
                camel: ERROR
                processor:
                    DeadLetterChannel: DEBUG

That will print a line in the logs every time something gets dead-lettered due to an exception
that hasn't been handled in the code.


Cheers,
Valdis

-----Original Message-----
From: Wang Yan [mailto:wyanbox@gmail.com] 
Sent: 06 March 2019 13:17
To: users@camel.apache.org
Subject: DeadLetterChannel handle option

Hello All,

based on below document
if handle =false the message will be propagated to caller when exception happened if handle=true,
the message will not be propagated to caller but somewhere else as you can define . is my
understanding correct?

http://scanmail.trustwave.com/?c=6600&d=2sj_3M0KVwaA2voGn_01oHSf2lEMV672cpA88z2Sww&s=33&u=http%3a%2f%2fcamel%2eapache%2eorg%2fdead-letter-channel%2ehtml
The *DeadLetterChannel* lets you control behaviors including redelivery, whether to propagate
the thrown Exception to the caller (the *handled* option), and where the (failed) Exchange
should now be routed to.

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Tá Vhi Group DAC (Vhi) ina chuideachta sealbhaíochta le haghaidh seirbhísí árachais agus
seirbhísí cúram sláinte, lena n-áirítear Vhi Healthcare DAC, Vhi Insurance DAC, Vhi
Health Services DAC agus Vhi Investments DAC. Déanann Banc Ceannais na hÉireann rialáil
ar Vhi Healthcare DAC, ag trádáil dó mar Vhi Healthcare, agus ar Vhi Insurance DAC, ag
trádáil dó mar Vhi Insurance. Tá Vhi Healthcare ceangailte le Vhi Insurance DAC le haghaidh
árachas sláinte in Éirinn, rud atá frithgheallta ag Vhi Insurance DAC. Tá Vhi Healthcare
ceangailte le Zurich Life Assurance plc le haghaidh Árachais Saoil de chuid Vhi agus Árachas
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Sláinte Idirnáisiúnta de chuid Vhi atá frithgheallta ag Astrenska Insurance Limited. Chun
tuilleadh faisnéise a fháil faoi Ghrúpa Vhi, tabhair cuairt ar: https://www.vhi.ie/about-vhi.


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