When Hibernate flushes a Session, how does it decide which objects in the session are dirty?

Question

My understanding of Hibernate is that as objects are loaded from the DB they are added to the Session. At various points, depending on your configuration, the session is flu

Answer 1

Take a look to org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck Every element in the session goes to this method to determine if it is dirty or not by comparing with an untouched version (one from the cache or one from the database).