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https://issues.apache.org/jira/browse/OPENJPA-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461949#comment-13461949
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Pinaki Poddar commented on OPENJPA-1532:
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Whether <shared-cache-mode> activates data cache or not -- is not the issue I
have raised. In fact I tend to agree that shared-cache-mode should activate
Data Cache. My concern is *how* it is to be done.doing it in a case-by-case
basis is weaker design construct. A design to support co-dependent
configuration should be followed.
> Should the <shared-cache-mode> element in a persistence unit definition
> automatically turn on the data cache?
> -------------------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-1532
> URL: https://issues.apache.org/jira/browse/OPENJPA-1532
> Project: OpenJPA
> Issue Type: Question
> Components: datacache
> Affects Versions: 2.0.0-M1, 2.0.0-M2, 2.0.0-M3, 2.0.0-beta, 2.0.0, 2.0.1,
> 2.1.0
> Reporter: Jody Grassel
> Assignee: Rick Curtis
> Priority: Minor
> Attachments: OPENJPA-1532.patch.txt
>
>
> The JPA 2.0 spec introduces a new persistence unit definition element,
> <shared-cache-mode>, which accepts NONE, ALL, ENABLE_SELECTIVE, and
> DISABLE_SELECTIVE. The JPA 2.0 spec section 3.7.1 documents the behavior of
> each of those modes.
> What I am curious about is if the use of <shared-cache-mode> should
> implicitly enable OpenJPA's data cache plugin. Currently, the above element
> is completely ignored if the persistence unit is missing the properties:
> openjpa.DataCache=true and openjpa.RemoteCommitProvider=sjvm (because by
> default, OpenJPA disables data caching). My interpretation of the spec
> suggests that <shared-cache-mode> is not only a platform-independent method
> of instructing the data cache which entities are eligible for admittance to
> the data cache, but it is also a switch providing a platform-independent
> method of both turning the data cache on or off (since whether the cache is
> enabled by default is platform-specific). Otherwise, why have a NONE value,
> if it was not intended to be a platform independent means of turning the data
> cache off?
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