[cdi-dev] [JBoss JIRA] (CDI-473) Standardize eager initialisation of ApplicationScoped bean

[Claus Ibsen (JIRA)]

    [ https://issues.jboss.org/browse/CDI-473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181329#comment-13181329 ] 

Claus Ibsen commented on CDI-473:
---------------------------------

> That request should ideally be moved forward as part of bringing better Java SE support in CDI 2.0.
+1

Yeah I would love to see CDI 2.0 being able to do all the needed stuff on plain Java SE. There is a lot of movement to MSA and plain old java main apps. So lets try to make CDI 2.0 the best DI library for that. Its almost there. 

> Standardize eager initialisation of ApplicationScoped bean
> ----------------------------------------------------------
>
>                 Key: CDI-473
>                 URL: https://issues.jboss.org/browse/CDI-473
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>          Components: Contexts
>            Reporter: Antonin Stefanutti
>             Fix For: 2.0 (discussion)
>
>
> Given the proxying strategy documented in the CDI specification, normal scoped beans get initialize when an injected proxy reference is first called.
> While that's perfectly fine in the vast majority of use cases, that proves inconvenient when dealing with {{ApplicationScoped}} beans that capture application singletons which we want to bound to the application lifecycle with a {{postConstruct}} callback. As this callback is only called when a proxy is invoked, it is frequent to see the application developers using a CDI extension to meet that need, e.g.:
> {code}
> void forceInitialization(@Observes AfterDeploymentValidation adv, BeanManager manager) {
>     for (AnnotatedType<?> type : eagerBeans)
>         // Calling toString is necessary to force the initialization of normal-scoped beans
>         BeanManagerHelper.getReferencesByType(manager, type.getBaseType(), AnyLiteral.INSTANCE).toString();
> }
> {code}
> There should be a concise way to declare that intent which would then be address by the CDI container, for example:
> {code}
> @ApplicationScoped(eager = true}
> class EagerApplicationScopedBean {
> }
> {code}



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