[cdi-dev] [JBoss JIRA] (CDI-409) Having @Alternatives for resource definition

Romain Manni-Bucau (JIRA) jira-events at lists.jboss.org
Tue Nov 26 07:19:05 EST 2013

    [ https://issues.jboss.org/browse/CDI-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926721#comment-12926721 ] 

Romain Manni-Bucau commented on CDI-409:


I think it is not a CDI issue but a EE issue. Basically CDI is just a client for these resources which are not CDI beans and these resources mainly rely on JNDI to get an @Alternative behavior. Mixing both is IMO not sane since it will lead to mix and create cycles between specs which finally leads to weird behavior(s) at deployment or worse at runtime.

A convention to declare a resource as cdi bean through a particular qualifier maybe sounds more pragmatic to me, wdyt?
> Having @Alternatives for resource definition
> --------------------------------------------
>                 Key: CDI-409
>                 URL: https://issues.jboss.org/browse/CDI-409
>             Project: CDI Specification Issues
>          Issue Type: Bug
>    Affects Versions: TBD
>            Reporter: Antonio Goncalves
> Java EE 6 introduced @DataSourceDefinition and Java EE 7 introduced the same way of defining other resources (JMS factory/destination, Mail factory, JCA connectors....). 
> It would be interesting to have @Alternatives working with these resource definitions. For example you could have a default DS for development : 
> {code}
> @DataSourceDefinition(
>         className = "org.apache.derby.jdbc.EmbeddedDataSource",
>         name = "java:global/jdbc/devDS",
>         user = "dev",
>         password = "dev",
>         databaseName = "dev",
>         properties = {"connectionAttributes=;create=true"}
> )
> public class DevResources {...}
> {code}
> And another DS that would be used, let say, in production as an alternative :
> {code}
> @Alternative
> @DataSourceDefinition(
>         className = "org.apache.derby.jdbc.EmbeddedDataSource",
>         name = "java:global/jdbc/prodDS",
>         user = "prod",
>         password = "prod",
>         databaseName = "prod",
>         properties = {"connectionAttributes=;create=true"}
> )
> public class ProdResources {...}
> {code}

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