This is a limitation of OJB. Basically you need some pointer in the
database to the referenced object. This is done via a foreignkey column
which is provided by the productGroupId field. In the current version of
OJB I think you don't need an actual field in the class anymore but can
use anonymous fields (see here for details:
http://db.apache.org/ojb/howto-use-anonymous-keys.html ). However you
still need to specify this foreignkey in the reference.
Anonymous fields are supported by the new version of the xdoclet ojb
module so I suggest you update it from the OJB CVS.
Tom
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