Re: [cdi-dev] @New and producer methods/fields

From: Pete Muir <pmuir(a)redhat.com&gt; To: Mark Struberg <struberg(a)yahoo.de&gt; Cc: &quot;cdi-dev(a)lists.jboss.org&quot; <cdi-dev(a)lists.jboss.org&gt; Sent: Sunday, September 25, 2011 10:11 PM Subject: Re: [cdi-dev] @New and producer methods/fields On 25 Sep 2011, at 21:10, Mark Struberg wrote: > As explained below: in every case where you need a producer method to create a useful bean, then @New just doesn't work. > > > My usecase was that I would have needed one of those EntityManagers for unit tests. And since unit tests are no CDI managed beans thus cannot use @Transactional, I wanted to just create a manually managed contextual instance. It wasn't intended for this use case, but we could consider if this is possible. File an issue, I have a bad feeling there is a gotcha in here somewhere, but not sure atm. > > @New currently is basically only useful for creating new instances of a class (which must not even be a managed bean but vetoed...). This is the use case for which it is intended. > > > LieGrue, > strub > > > > ----- Original Message ----- >> From: Pete Muir <pmuir(a)redhat.com&gt; >> To: Mark Struberg <struberg(a)yahoo.de&gt; >> Cc: &quot;cdi-dev(a)lists.jboss.org&quot; <cdi-dev(a)lists.jboss.org&gt; >> Sent: Sunday, September 25, 2011 9:56 PM >> Subject: Re: [cdi-dev] @New and producer methods/fields >> >> Section 3.12 states "For each managed bean, and for each session bean, a >> second bean exists which:" >> >> So, there are no @New beans for producers. >> >> What is the use case you are trying to address? >> >> On 24 Sep 2011, at 11:35, Mark Struberg wrote: >> >>> Hi folks! >>> >>> We recently talked about ways to properly destroy beans which got created >> via Instance or @New. >>> I just realized that only having >>> @Inject @New MyClass dings; >>> might not be enough. >>> >>> Imagine you have 2 producer methods which create EntityManagers >>> >>> public class EntityManagerProducer {  >>>       @Produces @RequestScoped @UserDb >>>       public void createUserDbEm() { >>>           return >> entityManagerFactory.createEntityManager("userdb"); >>>       }    >>>     >>>       @Produces @RequestScoped @AdminDb >>>       public void createAdminDbEm() { >>>           return >> entityManagerFactory.createEntityManager("admindb"); >>>       }    >>> } >>> >>> If I need a 'temporarily self managed' userdb EntityManager, I >> cannot just >>> type >>> @Inject @New @UserDb EntityManager userDbEm; >>> because according to the spec there is only 1 Bean with exactly @New (and >> none with additional @UserDb) >>> The @New is basically useless for producer methods, isn't? >>> >>> Do we like to address this somehow? >>> >>> LieGrie, >>> strub >>> >>> >>> _______________________________________________ >>> cdi-dev mailing list >>> cdi-dev(a)lists.jboss.org >>> https://lists.jboss.org/mailman/listinfo/cdi-dev >>