Hi all,

my question is: is it possible to have a one-to-many association modeled as a Set property from a nullable column?

Trying to do it, I recieve a NullPointerException from Hibernate 3.0.5 (and 3.1.2) when flushing a new source object.

Here my test case is:

http://forum.hibernate.org/viewtopic.php?t=955282

Where am I wrong?
Thank you very much for your help,

Enri.

My first guess would be that hibernate is calling attivita.setTipologie(null) at some point. Try changing the implementation of the default set in Attivita to

Hi tenwit and thank you for your reply.

I have made the change you suggested to me, but the error is still there.

I think Hibernate is trying to get the hashCode of the whole <Tipologia>Collection, calculating it on the value of the column ID_TIPO_ATTIVITA (the tipologia field) on the Attivita entity.
The problem is that ID_TIPO_ATTIVITA is a nullable column and so the NullPointerException. I argued this analyzing the stack trace and with the help of the eclipse debug inside Hibernate source code.

So my question is: is there any way to tell hibernate that my association is an optional association from a nullable column?

Thank you all.

Enrico.