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From "Torsten Mielke (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CAMEL-4616) register exception listener with camel-jms producer endpoint
Date Fri, 04 Nov 2011 09:55:00 GMT

     [ https://issues.apache.org/jira/browse/CAMEL-4616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Torsten Mielke updated CAMEL-4616:
----------------------------------

    Description: 
camel-jms should register an exception listener automatically when used as a message producer.
That way it can deal with any exception that may occur on async sends.

To be more precise:
If a camel-jms producer sends a msg within a transaction to an ActiveMQ broker, then this
message send happens async by default (kind of an optimization done by ActiveMQ). If anything
goes wrong with the send (e.g. broker raises a javax.jms.ResourceAllocationException because
its full or there is a transport problem) then we currently don't catch this exception as
there is no async exception listener registered. What's worse the TX will be committed thereafter
although the send has actually failed.
As a result the msg is lost. 

For ActiveMQ there is a simple solution to this problem, either
- set jms.useAsyncSend=false on the broker URL, or
- call setAlwaysSyncSend(true) on the ActiveMQConnectionFactory


However many users won't be aware of this solution and will simply assume that using a transaction
is enough to guard against message loss. 
Also the same problem can potentially arise with other JMS providers if they also use async
send within a transaction. 

Camel should ensure that the out of the box behavior prevents from loosing msgs in transactional
sends.



  was:
camel-jms should register an exception listener automatically when used as a producer. That
way it can deal with any exception that may occur on async sends.

To be more precise:
If a camel-jms producer sends a msg within a transaction to an ActiveMQ broker, then this
send happens async by default (kind of an optimization done by ActiveMQ). If anything goes
wrong with the send (e.g. broker raises a javax.jms.ResourceAllocationException because its
full or there is a transport problem) then we currently don't catch this exception as there
is no async exception listener registered. What's worse the TX will be committed thereafter
although the async send has actually failed.
As a result the msg is lost. 
For ActiveMQ there is a simple solution to this problem: either
- set jms.useAsyncSend=false on the broker URL, or
- call setAlwaysSyncSend(true) on the ActiveMQConnectionFactory


However many users won't be aware of this solution and will surely assume that using a transaction
is enough to guard against message loss. 
Also, the same problem can arise with other JMS providers if they also use async send within
a transaction. 

Camel should ensure that the out of the box behavior prevents from loosing msgs in transactional
sends.



    
> register exception listener with camel-jms producer endpoint
> ------------------------------------------------------------
>
>                 Key: CAMEL-4616
>                 URL: https://issues.apache.org/jira/browse/CAMEL-4616
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-jms
>    Affects Versions: 2.8.2
>         Environment: camel-jms producer sending to ActiveMQ 
>            Reporter: Torsten Mielke
>              Labels: transactions
>
> camel-jms should register an exception listener automatically when used as a message
producer. That way it can deal with any exception that may occur on async sends.
> To be more precise:
> If a camel-jms producer sends a msg within a transaction to an ActiveMQ broker, then
this message send happens async by default (kind of an optimization done by ActiveMQ). If
anything goes wrong with the send (e.g. broker raises a javax.jms.ResourceAllocationException
because its full or there is a transport problem) then we currently don't catch this exception
as there is no async exception listener registered. What's worse the TX will be committed
thereafter although the send has actually failed.
> As a result the msg is lost. 
> For ActiveMQ there is a simple solution to this problem, either
> - set jms.useAsyncSend=false on the broker URL, or
> - call setAlwaysSyncSend(true) on the ActiveMQConnectionFactory
> However many users won't be aware of this solution and will simply assume that using
a transaction is enough to guard against message loss. 
> Also the same problem can potentially arise with other JMS providers if they also use
async send within a transaction. 
> Camel should ensure that the out of the box behavior prevents from loosing msgs in transactional
sends.

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