[cdi-dev] [JBoss JIRA] (CDI-627) fix wording regression for beans.xml alternative check introduced in 1.2

Mark Struberg (JIRA) issues at jboss.org
Fri Sep 9 03:43:00 EDT 2016

    [ https://issues.jboss.org/browse/CDI-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13290973#comment-13290973 ] 

Mark Struberg commented on CDI-627:

Or simply word it the other way around (as proposed in my initial comment):

For any <class> listed in the <alternatives> section at least one of the following conditions must be met:
* A class T exists which is annotated with @Alternative  or contains a producer field or producer method which is annotated with @Alternative
* There exists a Bean<T> for the bean class with isAlternative() == true
Otherwise the container automatically detects the problem...

> fix wording regression for beans.xml alternative check introduced in 1.2
> ------------------------------------------------------------------------
>                 Key: CDI-627
>                 URL: https://issues.jboss.org/browse/CDI-627
>             Project: CDI Specification Issues
>          Issue Type: Bug
>          Components: Concepts
>    Affects Versions: 1.2.Final
>            Reporter: Mark Struberg
>             Fix For: 2.0 (proposed)
> My scenario is the following:
> I have an @Alternative MockMailService class which should only be used during testing to not send out 5k mails to customers and employees when running the unit and integration test suite.
> {code}
> @Alternative
> @ApplicationScoped
> @Exclude(ifProjectStage=Production.class)
> public class MockMailService implements MailService {...}
> {code}
> Of course I only need to activate it in beans.xml:
> {code}
> <beans>
>   <alternatives>
>     <class>org.acme.MockMailService</class>
>   </alternatives>
> </beans>
> {code}
> This is perfectly fine in CDI 1.0 but might be interpreted as not be allowed in the CDI 1.2 wording paragraph "Declaring selected alternatives for a bean archive".
> Please note that we introduced a check in CDI 1.0 purely to help the customer eagerly detect possible wrong configuration. E.g. if he simply has a typo in the classname. It was _not_ intended to restrict useful use cases!
> What the intention was: all is fine IF one of
> * There exists a class T with the given name
> * That class T (or a contained producer field or producer method) is annotated with @Alternative
> * There is a Bean<T> with isAlternative() == true

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