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Behaviour merge() of detached objects [message #1079837]

Mon, 05 August 2013 06:21

Jack Kilian

Messages: 40
Registered: March 2012

Member

Hi,

a short EclipseLink newbie question.

We compared hibernate and EclipseLink regarding the merge of detached objects.
Hibernate return's a new java reference when we do this? When we think about a FatClient like RCP not a good behaviour...e.g. binding and etc. is a pattern not working like this.

What's the behaviour of EclipseLink? Is this a standard behaviour of the JPA2 spec?
(That's one key requirement to use EclipseLink instead of Hibernate.)

best regards
JK

[Updated on: Mon, 05 August 2013 07:01]

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Re: Behaviour merge() of detached objects [message #1082407 is a reply to message #1079837]

Thu, 08 August 2013 14:26

James Sutherland

Messages: 1939
Registered: July 2009
Location: Ottawa, Canada

Senior Member

The JPA specification requires that merge() returns the managed version of the detached object (it must be a new reference).

That is the whole point of merge(). If you don't want this, if the object is new, then consider using persist().

James : Wiki : Book : Blog : Twitter

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