[cdi-dev] [JBoss JIRA] (CDI-574) Should a disabled @Specialized disable a second bean?

[Antoine Sabot-Durand (JIRA)]

    [ https://issues.jboss.org/browse/CDI-574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134949#comment-13134949 ] 

Antoine Sabot-Durand commented on CDI-574:
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Guys. I already gave my opinion during last meeting:
* alternatives can be selected at bean archive level
* specialization is global
* If an alternative is selected in at least one bean archive the bean is enabled.
* If a specializes bean is enabled, the bean that was specialized is disabled 

There is no ambiguity here.
I agree that it's not an intuitive behavior but now it's written in black on white in the spec.
On the other hand I find the topic very "corner-case-ish" : the use case described suppose that I own the corresponding bean archive so I can change their config (or use {{@Priority}}) to obtain the expected behavior.
Working on a global config proposal (as we spoke during face to face) would more helpful than continuing this thread IMO.

> Should a disabled @Specialized disable a second bean?
> -----------------------------------------------------
>
>                 Key: CDI-574
>                 URL: https://issues.jboss.org/browse/CDI-574
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>          Components: Inheritance and Specialization
>    Affects Versions: 1.2.Final
>         Environment: n/a
>            Reporter: Emily Jiang
>
> In CDI specification Section 4.3:
> When an enabled bean, as defined in Section 5.1.2, “Enabled and disabled beans”, specializes a second bean, we can be certain that the second bean is never instantiated or called by the container. Even if the second bean defines a producer or observer method, the method will never be called.
> The spec says only an enabled bean can specialize a second bean. Can a disabled specialized bean specialize a second bean?
> Weld asserts a disabled specialized bean specializes a second bean while OWB asserts a disabled specialized bean does not specialize a second bean.
> This needs to be clarified.
> In more details:
> I have an application containing two wars.
> testDiffBDA.war
> testDiffBDA.war/WEB-INF/classes/test/diff/web/FrontEndServlet.class
> @Inject CounterProducerConsumerModified2 bean;
> beans-xml-modified2.jar
> containing one bean and an empty-ish beans.xml :
> @Inject at CounterModifiedQualifier String modifiedProducer;
> beans-xml-modified.jar.jar
> CounterModifiedQualifier  (the interface)
> CounterProducerModified (the bean implementing that interface)
> AlternativeCounterProducerModified (an alternative specialized bean)
>  beans.xml
>    <alternatives>
>         <class>com.ibm.jcdi.test.beansxml.AlternativeCounterProducerModified</class>
>    </alternatives>
> My application failed deployment with the error on Weld but worked on OpenWebBeans
> {code}
> [ERROR   ] CWWKZ0004E: An exception occurred while starting the application testDiffBDA. The exception message was: com.ibm.ws.container.service.state.StateChangeException: org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type String with qualifiers @CounterModifiedQualifier
>   at injection point [BackedAnnotatedField] @Inject @CounterModifiedQualifier com.ibm.jcdi.test.beansxml.CounterProducerConsumerModified2.modifiedProducer
>   at com.ibm.jcdi.test.beansxml.CounterProducerConsumerModified2.modifiedProducer(CounterProducerConsumerModified2.java:0)
> {code}
> After further investigation and talking to Martin from Weld, the error was caused due to the fact of AlternativeCounterProducerModified disabling the CounterProducerModified bean but itself is not enabled in the jar of beans-xml-modified2.jar. Therefore, no producer is active to produce a bean with the qualifier CounterModifiedQualifier.
> From Weld's perspective, any bean annotated with @Specialized disables a second bean regardless whether itself is active or not.
> My understanding is that the specialized should only take effect if itself is enabled. Otherwise, we run into the situation of where the specialized bean is not enabled but it disabled another bean. To me, it is wrong.



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