Session session = sessionFactory.openSession();
tx = session.beginTransaction();
Dog dog = new Dog("Zeus");
session.save(dog);         
session.evict(dog);         
dog.setName("Apollo");                  
tx.commit();         

15:33:21,519 ERROR AssertionFailure:22 - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
org.hibernate.AssertionFailure: possible nonthreadsafe access to session
...

tx = session.beginTransaction();
Dog dog = new Dog("Zeus");
session.save(dog);         
//session.evict(dog);         
dog.setName("Apollo");                 
tx.commit();