[cdi-dev] Clarification on the difference on Vetoed and exclude filters regarding Java EE component classes

[Emily Jiang]

Thanks Martin for your reply! Your reply confirmed my understanding of 
@Vetoed.

What is the expected behaviour if I exclude my JavaEE component class in 
the filter under beans.xml? Will this cause the JavaEE component class 
being ignored by CDI or this should have the same effect as being 
annotated as @Vetoed?

"In the 12.4.2, it states: If the filter is active, and: .... then we say 
that the type is excluded from discovery." 

Does the above discovery mean both type and bean discovery or just bean 
discovery? If it means both type and bean discovery, the classes should be 
ignored by CDI. Please confirm.

Many thanks,
Emily
===========================
Emily Jiang
WebSphere Application Server Liberty Profile development, CDI Development 
Lead
 
MP 211, DE3A20, Winchester, Hampshire, England, SO21 2JN
Phone:  +44 (0)1962 816278  Internal: 246278

Email: emijiang at uk.ibm.com 
Lotus Notes: Emily Jiang/UK/IBM at IBMGB




From:   Martin Kouba <mkouba at redhat.com>
To:     Emily Jiang/UK/IBM at IBMGB, cdi-dev at lists.jboss.org, 
Date:   07/08/2015 03:40
Subject:        Re: [cdi-dev] Clarification on the difference on Vetoed 
and exclude filters regarding Java EE component classes
Sent by:        cdi-dev-bounces at lists.jboss.org



Dne 6.8.2015 v 15:55 Emily Jiang napsal(a):
> In the section 3.6. Java EE components of CDI 1.2 specification, it has
> the following statement:
>
> /It is safe to annotate Java EE components with //@Vetoed //to prevent
> them being considered beans./
>
> According to my understanding, the JavaEE component classes with @Vetoed
> should still support injections and *ProcessInjectionTarget*events
> should still be fired.
>
> In the 12.4.2, it states:
> /If the filter is active, and: .... then we say that the type is
> excluded from discovery./
>
> Does this mean if a JavaEE component class is excluded from the scan in
> the beans.xml, its CDI involvement should be ignored (@Inject would be
> ignored etc)?

I don't think so. I believe the intent of "3.6. Java EE components" is 
to clarify that if a component class (e.g. a servlet class) is also 
recognized as a managed bean [1] there will be two different 
"components" in your applicaion, each managed by a different Java EE 
technology - e.g. a servlet managed by the servlet container and a CDI 
bean with servlet class in its set of bean types.

The servlet has a different lifecycle, it's managed by a servlet 
container and as such must support injection (but cannot be injected, 
etc.).

This might be confusing and therefore it's a good idea to veto the Java 
EE component classes -> there will be no CDI bean definitions based on 
the component classes.

[1]
http://docs.jboss.org/cdi/spec/1.2/cdi-spec.html#what_classes_are_beans


>
> Many thanks,
> Emily
> ===========================
> Emily Jiang
> WebSphere Application Server Liberty Profile development, CDI
> Development Lead
>
> MP 211, DE3A20, Winchester, Hampshire, England, SO21 2JN
> Phone:  +44 (0)1962 816278  Internal: 246278
>
> Email: emijiang at uk.ibm.com
> Lotus Notes: Emily Jiang/UK/IBM at IBMGB
>
> Unless stated otherwise above:
> IBM United Kingdom Limited - Registered in England and Wales with number
> 741598.
> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 
3AU
>
>
> _______________________________________________
> cdi-dev mailing list
> cdi-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/cdi-dev
>
> Note that for all code provided on this list, the provider licenses the 
code under the Apache License, Version 2 (
http://www.apache.org/licenses/LICENSE-2.0.html). For all other ideas 
provided on this list, the provider waives all patent and other 
intellectual property rights inherent in such information.
>

-- 
Martin Kouba
Software Engineer
Red Hat, Czech Republic
_______________________________________________
cdi-dev mailing list
cdi-dev at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/cdi-dev

Note that for all code provided on this list, the provider licenses the 
code under the Apache License, Version 2 (
http://www.apache.org/licenses/LICENSE-2.0.html). For all other ideas 
provided on this list, the provider waives all patent and other 
intellectual property rights inherent in such information.



Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 
741598. 
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/cdi-dev/attachments/20150807/ddd1f56e/attachment-0001.html