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.
Of course I only need to activate it in beans.xml:
This is perfectly fine in CDI 1.0 but might be interpreted as not be allowed in the CDI 1.2 wording paragraph 188.8.131.52. "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