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

[Martin Kouba (JIRA)]

    [ https://issues.jboss.org/browse/CDI-473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181687#comment-13181687 ] 

Martin Kouba commented on CDI-473:
----------------------------------

[~meetoblivion] [~stefanutti] [~davsclaus] [~agoncal] So this the best we can do today, right? And in 2.0 it should be possible to add {{@Priority}} to the observer method...
{code:java}
@ApplicationScoped
public class Initializer {

  @Inject
  private Service1 service1;

  @Inject
  private Service2 service2;

  void init(@Observes @Initialized(ApplicationScoped.class) Object event) {
  }

  @PostConstruct
  void postConstruct() {
    service1.start();    
    service2.start();
  }
}
{code}

> 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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