Hi,

I'm using a simple one-to-many relationship between two classes. The relation is mapped as a simple set collection, nothing strange.

In the web I'm using the open session in view filter as suggested in the Hibernate in Action book. The problem is that when you load a class in a view, store it in the session context and then try to access the collection, hibernate sometimes throws an exception and sometimes it just loads the collection without problems.

I'm aware of the initialize() method to inject the current session back into the object, but why sometimes it does work ?

Here is the version that does work. Notice how the DefaultInitializeCollectionEventListener intercepts the call.



And this is the version that fails:



I'm using Hibernate 3.2. I'm trying to understand why in one case it uses the DefaultInitializeCollectionEventListener and in the other it just throws an exception.

Any comment would be really welcome.

Regards,
Juancho

By the exception it is very clear that due to some reason Hibernate identifies the session to be closed and hence when you try to access the collection outside the session it says - Lazyinitiallization exception, - so at that time you only have a proxy.

Anywayz, Could you send your code or some Test case to exhibit this.

I think that the problem in the first try is that the same BookCollection arrive at the same time (this is a webservice , so different threds, different session), so when they check if BookCollection is already exists they get false and they both trying to save it at the same time, so only one success (duplicate). i dont know how to solve it.

In the second try the BookCollection is already exists, it get it from the session and do saveOrUpadte to buyer , but failed because StaleStateException , i have no idea why, and how to debug it.

Thank you