[cdi-dev] [JBoss JIRA] (CDI-252) Allow transaction control inside observer methods

Jens Schumann (JIRA) jira-events at lists.jboss.org
Wed Aug 29 14:55:33 EDT 2012

    [ https://issues.jboss.org/browse/CDI-252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714689#comment-12714689 ] 

Jens Schumann commented on CDI-252:

Personally I don't think CDI should handle this. As written in CDI-213 observer methods are either synchronous method calls (IN_PROGRESS) or JTA synchronization callbacks. For both cases the JTA spec should maintain the restrictions. 

I would go for won't fix and further clarifications via CDI-213.

See Tom's comment in CDI-213:

Tom Jenkinson commented on CDI-213:

When I composed my initial response I was under the impression that the event consumer was async sorry. If an event consumer is more like an EJB RPC then flowing the transaction should be fine.

> Allow transaction control inside observer methods
> -------------------------------------------------
>                 Key: CDI-252
>                 URL: https://issues.jboss.org/browse/CDI-252
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Events, Java EE integration
>    Affects Versions: 1.1.EDR
>            Reporter: Pete Muir
>             Fix For: TBD
> From Tom Jenkinson
> {quote}
> Would it make sense to maintain the same restrictions as JMS?
> In JMS you can initiate a new transaction from onMessage, analogous to a method decorated with @Observes. If the method returns without completing the transaction then an error is logged and the transaction rolled back.
> Flowing a transaction from an event producer to an event consumer isn't a great idea (it doesn't work in JMS either). But allowing a consumer to control their own transaction does seem to make sense to me.
> Admittedly this is a gut reaction, I read through the Jira and the doc you linked to though, and used my JEE experience to draw analogies, do let me know if I got the wrong end of the stick please!
> {quote}

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