[cdi-dev] [JBoss JIRA] (CDI-227) BeanManager#resolve() is underspecified for corner cases

[Pete Muir (JIRA)]

    [ https://issues.jboss.org/browse/CDI-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756581#comment-12756581 ] 

Pete Muir commented on CDI-227:
-------------------------------

I've removed the bullet about not being available in the module. The reference in the section is to "ambiguous and unsatisfied dependencies", which isn't to do with the module resolution, which happens in the previous section. As Jozef points out, getBeans() is responsible for sorting this bit out. This is backed up by the javadoc for resolve

{quote}
Apply the ambiguous dependency resolution rules to a set of {@linkplain Bean beans}.
{quote}

Again only discussing ambiguous dependencies, not module resolution.
                
> BeanManager#resolve() is underspecified for corner cases
> --------------------------------------------------------
>
>                 Key: CDI-227
>                 URL: https://issues.jboss.org/browse/CDI-227
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Java SE Integration, Packaging and Deployment
>    Affects Versions: 1.0, 1.1.EDR
>            Reporter: Guy Veraghtert
>            Assignee: Pete Muir
>              Labels: patch
>             Fix For: 1.1.PFD
>
>
> The CDI api's are mainly used to develop (portable) extensions. In practice, we see that those so called _portable_ extensions are not portable at all due to underspecified api's.
> For example BeanManager.resolve(set) doesn't specify how to deal with an empty set or null. This leads to incompatible implementations and unportable extensions. See for example https://issues.apache.org/jira/browse/OWB-625 (Unfortunately Websphere 8 includes openwebbeans < 1.1.3, making Seam3 not out-of-the-box usable). Currently most implementations (weld, owb and candi) return null for an empty set. OWB returns null when null is passed, others will throw an exception.
> To create extensions that are truly portable, we should specify all corner cases (what about BeanManager.getBean((String)null)?). In theory  developers should not depend on undefined behavior, but in practice we all do (Seam3 is full of examples).
> Ideally, we should go over the complete public API and specify what should happen with these corner cases: null-values, empty collections, ...
> Just adding that an IllegalArgumentException should be thrown in case of null for example would suffice.
> These things are very easy to incorporate in the TCK and would contribute a lot to the success of portable extensions

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