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

[Martin Kouba (JIRA)]

    [ https://issues.jboss.org/browse/CDI-414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995317#comment-12995317 ] 

Martin Kouba commented on CDI-414:
----------------------------------

{quote}
Of course @Inject in @Stateless beans should work the same way as @EJB. It actually should really make no difference if you resolve the EJB via @Inject, @EJB or manually from JNDI. If this doesn't work it is a bug imo. 
{quote}
Well, this is not required by the spec. A SLSB must belong to the @Dependent pseudo-scope and the container is not required to support circular dependencies where every bean in the chain has a pseudo-scope. So there is a difference. In my opinion, SLSBs should belong to a special scope (see also CDI-278).

> 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).



--
This message was sent by Atlassian JIRA
(v6.3.1#6329)