[jira] [Closed] (JAMES-2275) Allow per Exception error handling in the mailet pipeline

["Tellier Benoit (JIRA)" <se...@james.apache.org>]

     [ https://issues.apache.org/jira/browse/JAMES-2275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tellier Benoit closed JAMES-2275.
---------------------------------

> Allow per Exception error handling in the mailet pipeline
> ---------------------------------------------------------
>
>                 Key: JAMES-2275
>                 URL: https://issues.apache.org/jira/browse/JAMES-2275
>             Project: James Server
>          Issue Type: New Feature
>          Components: Mailet Contributions
>    Affects Versions: master
>            Reporter: Tellier Benoit
>            Priority: Major
>              Labels: easy-fix, feature, newbie
>
> In JAMES-2271 from [~apptaro], the error handling system of the mailet pipeline can now be customized using the *onMailetException* property. This allows specifying the processor for error handling or ignore the error (by default error processor is triggered).
> While empowering the user to write custom error handling logic, the error handling code capabilities is limited as the original exception is lost along the way.
> We should:
>  - Pass the Exception along with the Mail, as an attribute. 
> Thus mailet in the error processor can access and read it. Throwable being serializable, this makes this change easy to perform.
>  - Implement specific error handling matchers:
>    - *HasException* would allow to see if a Mail has a specific exception
> {code:xml}
> <mailet match="HasException=org.apache.james.managesieve.api.ManageSieveException" class="...>
>     ....
> </mailet>
> {code}
> ### How to implement this
> 1. Add a ERROR_ATTRIBUTE_NAME contant in the Mail interface
> 2. ProcessorUtil:: handleException should add the ERROR_ATTRIBUTE_NAME attriute using the provided exception
> 3. Modify *AbstractStateMailetProcessorTest* to demonstrate that when a mailet or a matcher throws, the Exception is attahed to the incoming mail.
> 4. In the mailet/standard project, you will implement the HasException matcher. You can extend GenericMatcher and implement unit tests for your class.



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