Re: [eclipselink-users] EntityManager.copy/fetch and embeddables

[sr_dd <roe@xxxxxxxxxxxxxxxxx>]

First prob:
reproducer is on my todo-list.

Second prob:
Even when i add the whole embedded to the copyGroup the result is the same .
As additional info: i use a descriptorcusomizer to allow the embedded to be
null.

Other solutions?

Stefan


Andrei Ilitchev wrote:
> 
> 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
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