Re: One-to-Many ordered list not ordered when cached

[Tim Bruton]

Hi Chris,

Thank you very much for your solution. This fixed my cache issue.

Regards, Tim.

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Today's Topics:

   1. Re: One-to-Many ordered list not ordered when cached
      (christopher delahunt)


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Message: 1
Date: Fri, 04 Jul 2008 14:22:56 -0400
From: christopher delahunt <christopher.delahunt@...>
Subject: Re: [eclipselink-users] One-to-Many ordered list not ordered
        when cached
To: EclipseLink User Discussions <eclipselink-users@...>
Message-ID: <486E6A80.2090204@...>
Content-Type: text/plain; charset=windows-1252; format=flowed

Hello Tim,

Only the OrderedListContainerPolicy EclipseLink container policy will
attempt to maintain order when merging into the cache.
To use it, try: ((CollectionMapping)mapping).setContainerPolicy( new
OrderedListContainerPolicy(concreteContainerClass) );
This requires that you use a List implementation (such as Vector) for
your container class.

Best Regards,
Chris

Tim Bruton wrote:

>
> Hi all,
>
> I have a one to many mapping where the many objects should be sorted
> by a query key.
>
> In my Eclipselink workbench I have set the Advanced Container Options
> to List and java.util.ArrayList.
>
> The descriptor of my "many objects" calls an After Load method that
> sets useTransparentCollection() and addAscendingOrdering( "listSeqNo"

).

>
> I have a unit test that creates several instances of the "many
> objects" and they are created with ascending values on the query key
> (called "listSeqNo") as expected.
>
> The unit test then commits the transaction and a subsequent unit test
> then uses the objects, however the items are retrieved from the cache
> and are no longer in sorted order.
>
> If I later retrieve the same items from the database via a query the
> items are retrieved in correct order.
>
> I can not find a way to configure the cache to obey the ordering as
> dictated by the query key.
>
> I have tried removing the addAscendingOrdering() from my After Load
> method and setting it in the workbench on the one-to-many mapping
> (Ordering tab), but this did not help.
>
> I have tried not using a transparent collection (in the After Load
> method), but this did not help.
>
> I tried several combinations in the Advanced Container Options without

> success, although I have not tried the TreeSet, since it is not
> trivial to update our code.
>
> This is a new problem since migrating from Toplink 2.5.1 (ouch). I
> have tried everything I can think of to try to get this working.
>
> I am using eclipselink-incubation-1.0M9, Java 1.5 and Oracle 9i.
>
> I have found some similar issues but am not sure if they are the same
> cause, e.g.
>
> http://forums.oracle.com/forums/thread.jspa?messageID=2571698
>
> Please help with suggestions or information.
>
> Regards Tim.
>
>

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