I'm using the long session pattern put forward in HIA by Bauer&King. This works very well - no LazyInitializationException nor NonUniqueObjectExceptions when re-attaching objects. In fact, no re-attaching at all. The recipe is: 1. ServletFilter to manage mapping of Http-Sessions to Hibernate-Sessions and putting the latter in a convenient ThreadLocal 2. An IActionListener-Wrapper to commit/rollback as desired 3. Not forgetting to close your Session and throw away your persistent objects at an appropriate point (typically, this is "user choses new working-set" or somethin like that) Only "drawback" - the pattern is not supported by any IoC-Containers out of the box - at least by none I know of. If anybody is interested I could post some code ...
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