Re: [eclipselink-users] New instances and resolving mappings

[christopher delahunt <christopher.delahunt@xxxxxxxxxx>]

Hello,

Yes, only entities obtained from an EntityManager will be populated by 
the persistence provider.  If you instantiate a new entity instance, it 
has no connection to the EntityManager to get data. 

Best Regards,
Chris

Clogs wrote:
> Hello all, 
>
> I am faced with a problem which I am unable to get a grip on. This is the
> scenario: 
>
> I instantiate a POJO which is annotated as an Entity. In the POJO there are
> annotations which are used to reference other tables in the database, like: 
>
>     @ManyToOne(fetch=FetchType.LAZY,optional=false) 
>     @JoinColumn(name="LEVNR", referencedColumnName = "LEVNR", insertable =
> false, updatable = false) 
>     private Leverancier leverancier; 
>
>     public Leverancier getLeverancier() { 
>         return leverancier; 
>     } 
>     public void setLeverancier(Leverancier leverancier) { 
>         this.leverancier = leverancier; 
>     } 
>
> When I now invoke getLeverancier() on the instantiated object, I would
> expect a trip to the database to get the information. However, this never
> happens, 'leverancier' remains null and the application falls over. The
> information to retrieve the required leverancier is set-up correctly
> (LEVNR). 
>
> Does the newly created entity need be managed in order for mappings to work? 
> Am I overlooking anything? 
>
> Thanks...all help is appreciated
>
>