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https://issues.apache.org/jira/browse/DELTASPIKE-940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15110440#comment-15110440
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Xavier Dury commented on DELTASPIKE-940:
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Now I realize that there is an advantage using {{EntityManagerResolver}}
instead of qualifiers: with qualifiers, you need to {{@Produces}} the entity
manager which can cause trouble if it belongs to a passivation-capable scope
(see {{SerializableEntityManager}}). The problem does not exist with
{{EntityManagerResolver}} which does not produce anything but keeps the entity
manager reference for on-demand resolving. So maybe, it is the
{{@Transactional}} annotation which should have an {{entityManagerResolver}}
attribute.
> @Transactional and @EntityManagerConfig each use a different method to
> resolve EntityManagers
> ---------------------------------------------------------------------------------------------
>
> Key: DELTASPIKE-940
> URL: https://issues.apache.org/jira/browse/DELTASPIKE-940
> Project: DeltaSpike
> Issue Type: Improvement
> Components: Data-Module, JPA-Module
> Reporter: Xavier Dury
> Assignee: Thomas Hug
> Priority: Minor
>
> When an application uses multiple {{EntityManager}}'s, there must be a way to
> specify which one(s) should be used. Currently, {{@Transactional}} and
> {{@EntityManagerConfig}} use different approaches:
> - {{@Transactional}} can take one or more qualifiers directly in its
> {{qualifier()}} member ({{@Transactional(qualifier = MyDB.class)}})
> - While {{@EntityManagerConfig}} must define an {{EntityManagerResolver}}
> ({{@EntityManagerConfig(entityManagerResolver =
> MyDBEntityManagerResolver.class}})
> I think both should be unified and use a single way to specify which
> {{EntityManager}} to use. IMHO, the {{@Transactional}} way of doing looks
> better and should be applied to {{@EntityManagerConfig}}.
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