[cdi-dev] [JBoss JIRA] (CDI-247) It's currently not possible to implement a primitive and wrapping type producer method for the same type

[Martin Kouba (JIRA)]

    [ https://issues.jboss.org/browse/CDI-247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709354#comment-12709354 ] 

Martin Kouba commented on CDI-247:
----------------------------------

Maybe the inspection of IP wouldn't be necessary - the default values from Java language spec could be used for primitive types (see 4.12.5 Initial Values of Variables).
                
> It's currently not possible to implement a primitive and wrapping type producer method for the same type
> --------------------------------------------------------------------------------------------------------
>
>                 Key: CDI-247
>                 URL: https://issues.jboss.org/browse/CDI-247
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Concepts
>    Affects Versions: 1.0, 1.1.EDR1
>            Reporter: Mark Struberg
>             Fix For: 1.1 (Proposed)
>
>
> I like to implement a producer which can satisfy the following injection points:
> {code}
> private @Inject @IsFeatureA Boolean featureA;
> private @Inject @IsFeatureA boolean featureA;
> {code}
> Boolean (wrapper type) and boolean (primitive type) used at the same time.
> This is currently not allowed by the CDI spec!
> 5.2.4. "Primitive types and null values" defines that 
> "For the purposes of typesafe resolution and dependency injection, primitive types and their corresponding wrapper types in the package java.lang are considered identical and assignable."
> In the same paragraph it also states that
> "However, if an injection point of primitive type resolves to a bean that may have null values, such as a producer method with a non-primitive return type or a producer field with a non-primitive type, the container automatically detects the prob- lem and treats it as a deployment problem."
> This means that I can only have producer methods and fields which have primitive return values and never use their wrapper types if I like to inject into both boolean and Boolean fields.
> But if I use the primitive type, then I loose the ability to explicitly return null for those.
> Possible solution: 
> As primitives and their wrapper only can be @Dependent, it would be perfectly possible to e.g. inspect the InjectionPoint and on a primitive type return a default value and for a wrapper type return null.

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