Hello,
is it save to use this? If not, is there any other solution how to sumbit object to a different thread?



Thank you

Well... if you only read the id (or other properties) of the object it should be safe. It is not safe if you read other values which may trigger lazy initialization of associations or collections.

Hibernate and especially its session is not thread safe. Even just accessing the ID of an instance may cause lazy loading or similar things to happen, which might cause problem when running in parallel in multiple threads.

If you want the entity to be used in a different thread you have various options:

* detach the entity from the session, by removing it from the session or closing the session
* copy it in a new instance, e.g. a transfer object
*make sure only one thread uses a session at any given time, including all entities attached to that session.

In case I'm accessing regular properties there should be no lazy loading or similar things, am I right? (I'm using session.get())



OK, thanks for your suggestions. Cloning an object seems to be easiest solution in my case.

No, it doesn't, as is documented in http://docs.jboss.org/hibernate/stable/ ... ng-proxies (final part just before section 20.1.4)
And since the session.get() method is used this should mean that at least the "someObject" entity is initialized so it should be safe to read other properties than the id (assuming that no properties have been declared as lazy).



This will not work if accessing uninitialized proxies or collections. If the entity is detached it will result in a LazyInitializationException. The code example in the original post seems to suggest that the transaction is committed and the session is closed. So the thread actually has a reference to a detached object. And this is probably a "good" thing since a LazyInitializationException is easier to fix than some strange errors that only happen sometimes due to threading issues.
It might be better to move the commit and close to before the thread is started though.