Hi,

On Sun, Dec 28, 2014 at 1:52 PM, John D. Ament <john.d.ament@gmail.com> wrote:

EJBs work off of a pool of objects and these life cycle methods are typically used (from the use cases I've dealt with them) to initiate or destroy some end user data for the context in which they are used.

@PrePassivate/@PostActivate are used with @Stateful beans, which being unique instances are far less likely to be pooled. Pools are mostly used for @Stateless beans (if pools are used at all, the spec doesn't mandate those).

Kind regards,

Arjan Tijms

 

I think you might be thinking of PostConstruct/PreDestroy which match to the CDI/ManagedBean paradigm better.  There's no pool of these objects around, they simply get created and destroyed when done.  For each of the scopes you mentioned, I would use a PostConstruct/PreDestroy method to do the same thing.

John

On Sun Dec 28 2014 at 7:39:14 AM Antonio Goncalves <antonio.goncalves@gmail.com> wrote:

Hi all,

I was playing with @SessionScoped beans... and wondered if @PostActivate, @PrePassivate and @Remove would make sense in JSR 250 ?

At the moment these annotations belong to the javax.ejb package and are only used in @Stateful EJBs. With CDI scopes, we end up with a few "stateful" scopes (@SessionScoped, but also @ConversationScoped, @ViewScoped...) so why not having the same functionality in CDI ? @PreDestroy and @PostConstruct are already part of JSR 250. So why not having @PostActivate and @PrePassivate as well so they could be used in every bean ? 

BTW, while I was playing with @SessionScoped beans, I asked Antoine to show me how to remove a bean from the session. It's only a few lines of code, but again, why not having a @Remove annotation that does that (the exact same one of javax.ejb.Remove) ?

To summarize, why not taking some of those stateful EJB concerns back to JSR 250 so they could be used anywhere ?

Any thoughts ?

--

Antonio Goncalves
Software architect, Java Champion and Pluralsight author

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