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

[Antoine Sabot-Durand (JIRA)]

    [ https://issues.jboss.org/browse/CDI-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002374#comment-13002374 ] 

Antoine Sabot-Durand commented on CDI-414:
------------------------------------------

You're right [~agoncal]. But if we decide go that way we should propose something nicely design for *interceptors* and *decorators*. To satisfy this there are two obvious solutions IMO.

# enhance an annotation used by both mechanism. {{@Priority}} seems the only candidate here, or
# introduce an new annotation in interceptor spec to configure this behaviour on the bean or the interceptor / Decorator. Something like {{@InterceptorAttribute}} with different values (in the same spirit than {{@TransactionAttibute}} in EJB spec) 

I prefer solution 2 since this annotation could be put at different levels. wdyt?


> 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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