> I don't think it is *that* less efficient. Attaching those objects > likely means refreshing them too, so the only gain you would have is > the creation of objects, and those few instances wouldn't even be > noticable, while the extra session size of #2 might be. > What I meant was mostly efficiency in terms of database calls, where #1 would trigger some SQL SELECT's to retrieve the object from database, but in #2 & #3 an update would be triggered only if there are changes to the object when flushing the session. A version check can also be applied if the POJO is versioned. > Did you try to make a generic model for what you want? That model > should be able to access the current hibernate session, and on attach, > where #1models load using the id set in that model, here they would > just refresh the object they have. > I attach the objects I need to the ThreadLocal Hibernate Session in call to onAttach(). But there are problems. I attach an object using Session.lock() and the lock will cascade through the object graph, attaching associated objects depending on the cascade mode I define for them. However if I traverse the object graph opposite the cascade direction, I'll run into problems. For example I define lock cascade from Parent -> Children and re-attach a child, the parent wont get attached. So if I call child.getParent().getAddresses() the address collection wont be initialized and I get a lazy exception. Also I had issues with re-attaching serialized objects ending up having two objects with the same id in session. Although #2 and #3 are prettier than the first, I guess unless somebody finds a good solution to all these problems, we have to live with the ugly #1 ;-)
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