[cdi-dev] [JBoss JIRA] (CDI-414) Support for "self" injection

[Mark Struberg (JIRA)]

    [ https://issues.jboss.org/browse/CDI-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993674#comment-12993674 ] 

Mark Struberg commented on CDI-414:
-----------------------------------

~jharting I was refering to the sample to the original example which (for what I understood) does not work in Weld, but imo this must work according to the spec:

{code}
@ApplicationScoped
public class Foo {

    @Inject
    private Foo self;

    public MyValue getValue() {
      if (!cached) {
        return self.loadValueFromDb();
      }
      return cachedValue;
    }

    @Transactional
    public MyValue loadValueFromDb() {
       return em.....;
    }
}
{code}

Of course just calling this.xxx instead of self.xxx will NOT trigger the interceptor. This is what I already tried to clarify in the *edit* section of my last post.

> Support for "self" injection
> ----------------------------
>
>                 Key: CDI-414
>                 URL: https://issues.jboss.org/browse/CDI-414
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Resolution
>            Reporter: arjan tijms
>
> Many features of CDI and EJB work by means of a proxy that intercepts calls and adds 'aspects'. In Java it's however not possible to decorate the {{this}} pointer, so methods called on the same bean instance from within a method in the bean do not get their 'aspects' applied.
> This is a well known limitation, but in EJB it's possible to work around this by injecting a bean into itself. E.g.
> {code}
> @Stateless
> public class Foo {
>     @EJB
>     private Foo self;
>     // ...
> }
> {code}
> Also see http://adam-bien.com/roller/abien/entry/how_to_self_invoke_ejb
> Unfortunately using CDI and {{@Inject}} this doesn't work. Weld for instance fails the deployment and logs:
> {noformat}
> WELD-001443 Pseudo scoped bean has circular dependencies.
> {noformat}
> See also: http://adam-bien.com/roller/abien/entry/inject_vs_ejb
> Although there are workarounds, it would be great if {{@Inject}} in combination with CDI could support self injection as well.
> With that projects migrating from {{@EJB}} to {{@Inject}} can do so more easily and the capability can be convenient for new projects as well (e.g. calling two separate {{@Transactional}} methods from a single method without being required to create a new bean).



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