I am writing a Metadata-Server for a Storage virtualisation using JBoss
4.2.1. There I have a cupple of physical disks used to build a virtual
disk. There are EntityBeans for the the virtual disks and the physical
disk. Next there exists a SessionBean to be called by the storage ...

I am using EJB3 and Toplink.
I have a parent entity and a child entity that is a one to many, the
child has the cascade=all defined, and the parent has a collection for
all the children that belong to it.