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

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(a)uk.ibm.com Lotus Notes: Emily Jiang/UK/IBM@IBMGB From: Martin Kouba <mkouba(a)redhat.com&gt; To: Emily Jiang/UK/IBM@IBMGB, cdi-dev(a)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(a)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(a)uk.ibm.com > Lotus Notes: Emily Jiang/UK/IBM@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(a)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(a)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