Bruce, Well, the first problem I ever posted to this list was the following (http://www.mail-archive.com/[EMAIL PROTECTED]/msg11379.html): - MediumContainer contains a list of Medium. - A Medium can be a MediumForSound which is a Medium with a trackList. - CompactDisc and Record extend MediumForSound, holding their specific properties. When the mapping for the mediumList was: <field name="mediumList" type="kws.mediadb.business.Medium" collection="vector" get-method="getMediumList" set-method="setMediumList"> <sql many-key="id_medium_container"/> </field> and I tried to save a MediumContainer holding Record objects, the trackList was not saved.
If I changed the mapping to: <field name="mediumList" type="kws.mediadb.business.MediumForSound" collection="vector" get-method="getMediumList" set-method="setMediumList"> <sql many-key="id_medium_container"/> </field> the trackList was saved as it should. So I am guessing that Castor thinks the mediumList always contains objects of type Medium which aren't holding a trackList of course. The second problem was linked to something I posted more recently (http://www.mail-archive.com/[EMAIL PROTECTED]/msg13877.html and http://www.mail-archive.com/[EMAIL PROTECTED]/msg13906.html). Apparently this indeed was a bug. Then someone in the list suggested me to, maybe, look at a different JDO product and to see if that was working for me (instead of writing my own persistency layer). So I decided to take a look at Hibernate. It appears that Hibernate does not have the first problem I mentioned. Hibernate seems to support polymorphism very well. You can query the database for all Medium objects which returns a nice set of Record and CompactDisc objects. With Castor I had to first query for all Record objects and afterwards all CompactDisc objects, which is rather long-winded. Of course you can argue my object model is crap, which is probably the case ;) Hey I'm not a real programmer. This is something I do in my spare time. So in short Hibernate solved all my problems, and it had polymorphism which is a nice to have feature. regards, Kenneth ----------------------------------------------------------- If you wish to unsubscribe from this mailing, send mail to [EMAIL PROTECTED] with a subject of: unsubscribe castor-dev
