Hi to all,
i have three tables: Event - Comment - Place
Both events and places can have comments, so that the Event entity has a bidirectional <one-to-many> association with Comment, and Place has a bidirectional <one-to-many> association with Comment too.
The comment can be associated with an event or a place, but not with both.
The Comment has therefore two, not optional joins (because i don't know whether it will be associated with event or place):


What i actually wand to do is: when i delete the child entity Comment, i want the parent entity (that could be an Event or a Place) to update its comments collection automatically. I wonder if there is such a cascade propery to achieve this.
What i'd like to avoid is to check for the parent entity class, and then explicitly call [event or place].getComments().remove(comment)

Thanks in advance

Without knowing much about your setup, the only thing I can think that might get you there is to implement the onDelete method for a Hibernate Interceptor. You get access to objects as they are being deleted from there. It might get squirrely but it's the only way I can think to do what you want.

see http://docs.jboss.org/hibernate/core/3. ... vents.html