[jboss-jira] [JBoss JIRA] (WFLY-2539) Avoid adding dependency on batch impl to applications

[James Perkins (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-2539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925540#comment-12925540 ] 

James Perkins commented on WFLY-2539:
-------------------------------------

Currently leaving as is. It seems most subsystems add dependencies of the implementation to the deployment.

The issue seems to be since the implementation contains the CDI extension and producers Weld can't find them if the implementation is not on the TCCL.
                
> Avoid adding dependency on batch impl to applications
> -----------------------------------------------------
>
>                 Key: WFLY-2539
>                 URL: https://issues.jboss.org/browse/WFLY-2539
>             Project: WildFly
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: EE
>    Affects Versions: 8.0.0.Beta1
>            Reporter: Cheng Fang
>            Assignee: James Perkins
>
> Ony batch api needs to be added as dependency to all deployed apps.  Batch impl modules should not be exposed to application deployments.
> from IRC discussion on 11/19/2013:
> 10:57:05 - Nihility: […] currently we are stuffing batch implementation details into every module thats bad
> 10:57:29 - Nihility: cfang: jamezp_afk the only deps that a user deployment should have is on APIs
> 10:57:50 - Nihility: cfang: jamezp_afk the APIs then depend on an impl either dynamically or in their module.xml
> 10:58:55 - Nihility: cfang: jamezp_afk its ok to add the APIs to every deployment
> 10:58:55 - dmlloyd: not implementation modules
> 10:59:01 - cfang: Nihility: I recall we did come up with some coarse grained logic to reduce the impact
> 11:01:25 - dmlloyd: cfang, but the point is that the impl modules should not be on any application at all, batch or not
> 11:02:06 - Nihility: cfang: right the rule is basically a propagation rule. The user only sees what it can access, which are APIS, the APIs can see impl classes and thats isolation
> 11:02:33 - Nihility: cfang: its the reason that a user, for example can use their own XML parser
> 11:03:10 - Nihility: cfang: we have some exceptions because third party code isn't always correct
> 11:03:34 - Nihility: cfang: but we should strive for at least our code to be properly isolated. It's not urgent but it has something we need to fix

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