Do not clone objects list, just parent

I have a need to create an object and add it to the parent list. I'm currently doing it like that.
UnitOfWork uow = session.acquireUnitOfWork();
MyChild newChildClone = uow.newInstance(MyChild.class);
MyParent parentClone = uow.registerObject(parent);
newChildClone.setParent(parentClone);
parentClone.getChildren().add(newChildClone);
uow.commit();
This clone today of the parent's children, because they are responsible for the parentClone. How can I add a new child to the list without cloning all existing children?

Probably the best you worry is not so much on this subject.

If the collection is really large, you may want to consider,

-If you use weaving (as when you use JPA and an agent, but can also be used in the native API with some effort) and use followed (by default with weaving) and lazy attribute changes.
then the add() method will not trigger the collection to be instantiated. (must be use EclipseLink)
- Otherwise, you could just not add it and assumes that the collection is not instantiated, or refresh the object or effect of invalidating the object after the validation.
- Or just don't map the OneToMany relationship if you really never want to instantiate, query just for it if you really need.

---
James: http://www.eclipselink.org: http://en.wikibooks.org/wiki/Java_Persistence

Tags: Fusion Middleware

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