How to check for null values when using proxies?

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?

Thank in advance!
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