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Re: [eclipselink-users] EntityManager.copy/fetch and embeddables
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On 2/28/2012 6:58 AM, sr_dd wrote:
Hi,
i use EL 2.3.2 and work with large object-trees. In order to specify the
fetched object-tree before serialization (especially to reduce it) and
sending to an client i use the copy functionality with AttributeGroups.
First problem i had:
In some cases em.copy(List,AttributeGroup) throws several exceptions
resulting out of unloaded fields, i think if the same object occurs more
then once in the object tree. I work around this by first executing
em.load(List,AttributeGroup) and afterwards using copy.
Loading the group upfront is a good idea - can't copy an object without
loading it first.
However I think that copy should still work without it. May be you could
post a simple example reproducing this problem.
Second Problem:
em.copy does not set embeddables. The fields are empty even when i specified
them in the CopyGroup.
The whole embedded object could be added to AttributeGroup
(group.addAttribute(embedded)).
However "splitting" the embedded object to include a subset of its
attributes into the group is not supported
(group.addAttribute(embedded.attr1)).
Has anybody an idea about that?
regards
Stefan
