[cdi-dev] [JBoss JIRA] (CDI-712) Clarify whether is should be possible to "override" built-in Instance/Provider

[Martin Kouba (JIRA)]

Martin Kouba created CDI-712:
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             Summary: Clarify whether is should be possible to "override" built-in Instance/Provider
                 Key: CDI-712
                 URL: https://issues.jboss.org/browse/CDI-712
             Project: CDI Specification Issues
          Issue Type: Clarification
            Reporter: Martin Kouba


In theory, an extension could register an alternative custom bean to override the built-in Instance/Provider bean for injection points such as {{@Inject Provider<String>}}. 

It is not forbidden at the moment. The spec only states that there must be a built-in bean eligible for any injection point with Instance/Provider required type and any qualifier. See also https://docs.jboss.org/cdi/spec/2.0/cdi-spec.html#builtin_instance.

It seems to be a powerful feature. On the other hand, it might be a source of confusion. Take for example this injection point:
{code:java}
@Inject
@MyQualifier
Instance<String> instance;
{code}
The qualifier is now considered when calling {{instance.get()}} and NOT when resolving the injection point.

Note that the spec already allows to decorate built-in beans.



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