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Re: [eclipselink-users] Cache Characteristics of @ReadOnly Entities?
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Read-only objects are meant to only exist in the shared cache. Using an
isolated or not shared cache with read-only would be unusual. If you want
the object registered in the unit of work, then just don't mark it as
read-only.
To refresh a read-only object execute a query for it using the
"eclipselink.refresh"="true" query hint, or using the JPA 2.0 find() that
takes query hint properties with the refresh.
rscharer wrote:
>
> Hey folks,
>
> I've got a number of entities tagged as @ReadOnly, and I can't seem to
> control when they refresh their state from the database, either manually
> or through cache configuration. My ideal would be one of these two
> options:
>
> 1) Configure the cache so the state of a @ReadOnly entity is preserved for
> the duration of a single UnitOfWork.
> 2) Be able to manually refresh the state of a @ReadOnly entity.
>
> I've tried various ways to accomplish #1 (Even setting CacheType to NONE
> as an experiment) and EclipseLink doesn't seem to care. The documentation
> is sparse on the intersection of @Cache and @ReadOnly, though, so
> hopefully I'm just missing something.
>
> There isn't an obvious way to get at #2 either. @ReadOnly entities are
> detached, so calling EntityManager.refresh() just causes an exception.
>
> Anybody have any advice for me?
>
> Thanks,
> Ryan
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
EclipseLink , http://www.oracle.com/technology/products/ias/toplink/
TopLink
Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink ,
http://wiki.oracle.com/page/TopLink TopLink
Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
http://www.nabble.com/EclipseLink-f26430.html EclipseLink
Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
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