What relationship mapping strategies are available with EJB 3.0 Persistence?
I know that object relationship can be map by embedding objects or using foreign key mapping strateg, but is serialization of objects available?

What do you need that for?

Do you want @Embedded functionality?

A non-primitive type (e.g. Name) is treated as embedded:

- The @Embedded annotation is not necessary
- Embedded implies that the properties (or fields) of Name are mapped to the columns in the same table as Person

I know what embeding implies:-), but I need to know e.g. if is possible to serialize all collection in to the single column (this is possible in JDO 2.0).
Actually I need to know if serialization is possible to map any objects relationship (I could'n find it in EJB Specyfication, maybe I missed sth?)

The best way in hibernate is to use a UsercollectionType.
Otherwise I imagine than @Lob will serialize the collection.

The problem with this collection ids in one column feature is that, joining is either impossible or inefficient.

plus it breaks all the relational rules