Using hibernate 3.1.

I know that Session instances are not thread safe. However would it be save to load objects in a single thread, and then access these objects in multiple threads, given the fact that accessing these objects will trigger lazy loading?

I.e. the question is if lazy loading itself is thread safe, if internally it uses a single session?

No. Sessions are not thread safe and therefore they can't be accessed from multiple threads (without external synchronisation of the Session) regardless of whether that access is direct ("session.persist(myObject)") or indirect (eg. via lazy loading).

Cheers,
Peter