[news.eclipse.rt.eclipselink] Re: Negative Ids

[james.sutherland@xxxxxxxxxx (James )]

I don't think currently singleton primitive negative ids are allowed 
without the flag (non-primitive or composite are ok, 0 or negative).

Are you trying to allow negative ids on something that uses sequencing?  
That would be odd, but if you allow 0, and have a primitive int/long id 
then it will default to 0, so EclipseLink will think your two new objects 
are the same object.  You would need to use a Integer or Long so that the 
value is null when not assigned, or remove the allow zero id flag.  You 
can also set allowing 0 as an id on a per class basis using the 
@PrimaryKey and IdValidation settings,

See,
http://www.eclipse.org/eclipselink/api/1.1.1/org/eclipse/persistence/annotations/PrimaryKey.html