[cdi-dev] [JBoss JIRA] (CDI-228) Clarify that _all_ @Dependent beans created for a containers method invocation will get destroyed after the method exits

[Mark Struberg (JIRA)]

    [ https://issues.jboss.org/browse/CDI-228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736812#comment-12736812 ] 

Mark Struberg commented on CDI-228:
-----------------------------------

folks, this is still not clarified but an important point for CDI-1.1

Are method parameters for producer methods now assumed 'Transient' or 'Keep' ?

The CDI-1.1 draft completely ignores this new 'Transient' stuff by now, thus all our serialisation rules are a bit broken atm as well...
                
> Clarify that _all_ @Dependent beans created for a containers method invocation will get destroyed after the method exits
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CDI-228
>                 URL: https://issues.jboss.org/browse/CDI-228
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>          Components: Contexts
>    Affects Versions: 1.1.EDR
>            Reporter: Mark Struberg
>            Assignee: Pete Muir
>             Fix For: 1.1 (Proposed)
>
>
> This clarification is intended for all methods which gets invoked by the CDI container and create a new @Dependent contextual instance especially for this invocation. This can happen in @Observes, @Produces, @Disposal and @Inject methods as well as in @Inject contructors. Basically any @Dependent method-parameter InjectionPoint.
> Despite it's atm not specified whether this @Dependent instance will get stored, most containers store it in the CreationalContext of the bean containing the invoked method. This behaviour can lead to mem leaks and non-serializibility issues.
> TASK: Define that any @Dependent contextual instance will get properly destroyed after such method invocations. 
> There are 2 things we need to think about:
> 1.) any @PreDestroy method of those beans will get invoked after the method invocation, even if the @Dependent instance will stored away in a member field and still being used later. This will not make any problems in most cases. We just need to make people aware that this will happen.
> 2.) As any Decorator or Interceptor is also an @Dependent instance on our 'temporary' created @Dependent method parameter, those Interceptors and Decorators will _not_ be available after the method invocation. Storing away this bean and re-using it later will probably cause an Exception.
> I still think this is a small problem compared to creating tons of mem leaks. There are quite a few workarounds possible: 
> *) Instead of @Inject methods you can use @Inject field + @PostConstruct to initialize it.
> *) We might add an additional annotation which denotes either @Transactional or au contraire: @Keep for the method-param InjectionPoint

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