[cdi-dev] [JBoss JIRA] (CDI-230) Clarify that some Scope constellations for producer fields result in non portable behaviour

[Pete Muir (JIRA)]

     [ https://issues.jboss.org/browse/CDI-230?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pete Muir resolved CDI-230.
---------------------------

      Assignee: Pete Muir
    Resolution: Rejected


We will address via a FAQ/stackoverflow.
                
> Clarify that some Scope constellations for producer fields result in non portable behaviour
> -------------------------------------------------------------------------------------------
>
>                 Key: CDI-230
>                 URL: https://issues.jboss.org/browse/CDI-230
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>          Components: Beans
>    Affects Versions: 1.1.EDR1
>            Reporter: Mark Struberg
>            Assignee: Pete Muir
>             Fix For: 1.1 (Proposed)
>
>
> We should add something like the following to the producer-field paragraph:
> "When a producer field produces a bean with a 'shorter' Lifecycle than the scope of the class the producer field is defined in, non-portable behaviour results."
> An example:
> {code}
> @ApplicationScoped
> public class ContainerBean {
>   @Produces @RequestScoped
>   Something something = new Something(1, 2, 3);
>   void throwAway(@Disposes Something sthg) {
>     sthg.destroyMe();
>   }
> }
> {code}
> The problem is that each request will take 'something' from the @ApplicationScoped ContainerBean. Thus all requests share the same contextual instance! Afer the first request ends, the disposal method 'throwAway' will destroy the information inside the variable 'something' and leaves it in a broken state for all other requests -> bang...

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