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https://issues.jboss.org/browse/CDI-414?page=com.atlassian.jira.plugin.sy...
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Mark Struberg commented on CDI-414:
-----------------------------------
Had an offline conversation with Martin. The real reason is not the interceptor but the
check in Weld that you cannot inject itself in @Dependent scoped beans. Of course a SLSB
is not _really_ @Dependent but this was only a hack to describe that CDI should not apply
own proxies. But this triggers the aforementioned check in Weld. Which is not wrong from a
plain spec perspective - but it is not really helpful.
In OWB we do not check for cyclic injection at all as there are just too many scenarios
where it can happen.E.g A->B->A, A->B->C->A,... + all combinations with
@PostConstruct, @Inject methods, @Inject constructors, etc. You will get a stackoverflow
anyway if you do this. Not as nice a msg as in Weld, but we don't restrict
constellations which are perfectly valid that way ;)
Please also note that the same might happen if you use @Scope scopes in Weld. Even if
those non-299 scopes bring their own proxies, correct Martin?
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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