Re: How to check for null values when using proxies?

Hi,

Schmidt wrote:
> Hi,
> 
> Consider that an object A has an association with an object B. Also that
> dynamic proxies are in use so that when object A is loaded, a proxy to B is
> created and the object B itself is not materialized. Sometimes, before
> taking an action, I need to verify if there is a B object associated to A.
> This check is done as follows:
> if (a.getB() == null) {...}
> 
> The problem is that even if there isn't a B associated with A, OJB returns
> false because there is always a proxy between A and B. The check is actually
> done using the proxy reference which is always present.
> How can we handle that?
> 

Which version of OJB do you use? I try to reproduce this with the 
current source (OJB_1_0_RELEASE branch) without success. If class 
Article has a 1:1 relation to ProductGroup and I search for an Article 
without a ProductGroup I get:

Criteria c = new Criteria().addEqualTo("articleName", name + "without PG");
q = QueryFactory.newQuery(ArticleWithReferenceProxy.class, c);
Article br = (ArticleWithReferenceProxy) broker.getObjectByQuery(q);
assertNotNull(br);
assertNull(br.getProductGroup());

Could it be that the association between A and B is a 1:n relation?

regards,
Armin

> Thank in advance!