I need to provide explanation why following code works well:

List<Child> dummyList = new ArrayList<Child>();
for(Parent parent : parents) {
dummyList .addAll(parent.getChildren());
}

'Parent'-'Children' is mapped as

<bag name="children" cascade="all" batch-size="50" fetch="select">
<key column="PARENT_ID" foreign-key="FK_FFP_METADATA_FFP" />
<one-to-many class="Child" />
</bag>
-------
In DAO layer, when line 'dummyList .addAll(parent.getChildren());' is executed, children collections for ALL parents are loaded (initialized). This is exactly what I want.
=======================================
If, instead of 'addAll' I put following line:
Hibernate.initialize(parent.getChildren());
there will be initialized children collection for single (current) parrent only. That is behavior I can expect.

Can someone explain why, in first case, 'children' collections are initialized for all 'parents' and not just current 'parent'?

I would guess there is some eager-loading taking place somewhere, but without a more complete mapping it is hard to tell.

there is not much mapping. simple parent-child relationship, bag on many side.

anybody else? at least idea where to look for.