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https://issues.apache.org/jira/browse/JAMES-3080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rémi Kowalski closed JAMES-3080.
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> Make messages persistent in rabbitmq task manager workqueue
> -----------------------------------------------------------
>
>                 Key: JAMES-3080
>                 URL: https://issues.apache.org/jira/browse/JAMES-3080
>             Project: James Server
>          Issue Type: Improvement
>            Reporter: Rémi Kowalski
>            Priority: Major
>             Fix For: 3.5.0
>
>
> Regarding the persistence of messages in rabbitmq : To achieve this there are 
> two steps :
>  * the queue must be declared as {{durable}} (the declaration of the queue is 
> persisted rabbitmq is restarted)
>  * when sending a message, it must have a property setting its 
> {{delivery_mode}} to persistent. (the messages with this property are 
> persisted in case of a restart of rabbitmq)
> At the time being the rabbitmq workqueue in james :
>  * the queue is declared durable => Good
>  * the delivery_mode property is not set => Not good
>  * the exchange is not declared durable => Seems not good, but need testing
> What should be done is :
>  - set the `delivery_mode` property to '2' ( see 
> [https://www.rabbitmq.com/releases/rabbitmq-java-client/v2.4.1/rabbitmq-java-client-javadoc-2.4.1/index.html?com/rabbitmq/client/MessageProperties.html]
>  )
>  - verify if the exchange need to be declared 'durable' too. if so it will 
> need an entry in the migration guide. As it will need to be deleted an 
> created back with the new properties.



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