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https://issues.apache.org/jira/browse/ARIES-996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Ross reassigned ARIES-996:
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Assignee: John Ross
> JPA does not work for bundles that are constituents of subsystems.
> ------------------------------------------------------------------
>
> Key: ARIES-996
> URL: https://issues.apache.org/jira/browse/ARIES-996
> Project: Aries
> Issue Type: Bug
> Components: JPA
> Reporter: John Ross
> Assignee: John Ross
> Attachments: aries996.patch
>
>
> The org.apache.aries.jpa.container.context.impl.GlobalPersistenceManager
> class creates and manages multiple PersistenceContextManagers across multiple
> nested frameworks. More generally, "multiple nested frameworks" can be
> replaced with the term "isolation units". There is one
> PersistenceContextManager per isolation unit. Currently, the class uses a
> system bundle as the map key, which is fine for "multiple nested frameworks"
> since each nested framework contains its own system bundle along with a
> composite bundle. At least two problems arise when used with Subsystems,
> however, because there are isolation units (i.e. subsystems) existing within
> a single framework.
> The first problem is that the system bundle might be hidden from the client
> bundle by find hooks. This results in an NPE on line 104 of
> GlobalPersistenceManager.registerContext.
> The second problem is that even if the first is gotten around by getting the
> system bundle by location instead of by ID, duplicate transaction exceptions
> occur since there is only one system bundle.
> One solution would be to use a bundle tracker that tracks subsystem region
> context bundles. This is easily done since all region context bundles have
> the same symbolic name prefix per the spec.
> GlobalPersistenceManager.registerContext would first iterate over any tracked
> region context bundles. If a region context bundle is visible to the client
> bundle, then the bundle context of the region context bundle is used. If
> there are no region context bundles, or none are visible to the client
> bundle, then the system bundle context is used as before.
> A more general issue not addressed by this bug is how JPA should function
> within a framework isolated by any generic mechanism using hooks. It's not
> clear how the bundle context to use would be identified.
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