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https://issues.apache.org/jira/browse/OPENJPA-305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517437
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Craig Russell commented on OPENJPA-305:
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I agree with Patrick.
The intent of making the EMF not configurable after the first getEM is just so
that you can find an EMF based on the user-defined values.
If you ask for an EMF that has a default property, and that property has
changed, then you cannot get the behavior you expect.
> Dynamic configuration of EntityManagerFactory
> ---------------------------------------------
>
> Key: OPENJPA-305
> URL: https://issues.apache.org/jira/browse/OPENJPA-305
> Project: OpenJPA
> Issue Type: New Feature
> Reporter: Pinaki Poddar
>
> OpenJPA configures EntityManagerFactory at creation time via an instance of
> Configuartion object. Once EntityManagerFactory is created and a
> EntityManager is issued from it -- the Configuration is frozen by design.
> That is no further changes to Configuration is allowed as long as
> EntityManagerFactory lives.
> For certain configuration properties, it is desirable to change them during
> the lifetime of a EntityManagerFactory.
> This issue is raised to initiate a discussion on such a feature, the
> possibility and limitations of dynamic update and track the impact of such a
> change as frozen Configuration is an important assumption.
>
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