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

[Mark Struberg]

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.

@New currently is basically only useful for creating new instances of a class (which must not even be a managed bean but vetoed...).


LieGrue,
strub



----- Original Message -----
> From: Pete Muir <pmuir at redhat.com>
> To: Mark Struberg <struberg at yahoo.de>
> Cc: "cdi-dev at lists.jboss.org" <cdi-dev at lists.jboss.org>
> 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
>> 
>> 
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