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

[arjan tijms (JIRA)]

arjan tijms created CDI-414:
-------------------------------

             Summary: 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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