Re: How can I handle 1:1 relationships?

Hi,

Iris Soto wrote:
> Hello all,
> I've problems  to handle 1:1 relationships, I want this association is 
> navigable on both sides, from person to passport and vice versa.
> I'm working with OJB and Postgresql, how can i declare in the ojb 
> descriptor, in the schema this type of relationships, i try this way, 
> but i get the following error:
> proxy.IndirectionHandler - Can not materialize object for Identity 
> org.apache.ojb.Person{25} - using PBKey org.apache.ojb.broker.PBKey: 
> jcdAlias=default, user=postgres, password=*****

Which version of OJB do you use?
Did you enable CGLib proxy support in OJB.properties file?
Did your test pass without using proxied references?

In your mapping you don't use separate FK for the 1:1 references. This 
could cause unexpected behavior when using proxy references. Assume you 
are nullify the Passport of a Person. Next time you materialize the 
Person object OJB tries to resolve the reference to Passport by lookup 
the FK defined in Person. You define the Person PK as FK for Passport 
reference (the FK to Passport could never be nullified), thus OJB assume 
that the reference to Passport still exists and create a proxy reference 
(instead of setting null). If you now try to access the Passport 
reference in Person you will get a NPE, because OJB can't find the 
Passport object.

regards,
Armin