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https://issues.apache.org/jira/browse/OPENJPA-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837529#action_12837529
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Kevin Sutter commented on OPENJPA-1532:
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Absolutely, the JPA 2 <shared-cache-mode> element should affect the existing
OpenJPA DataCache enablement. That should be part of the integration work. I
am reading the spec like you are and the <shared-cache-mode> affects whether to
use an L2 cache for caching entities or not. I read that to mean that it
should also affect the enablement of the cache. Unless we can find something
in the spec that indicates otherwise, I would say that this is a bug.
> 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
> Priority: Minor
>
> 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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