Hibernate merge não funciona, nada acontece, executa mas não salva

public void merge(T bean) throws DaoException {  
      try {  
         Transaction transaction = this.session.beginTransaction();  
         this.session.merge(bean);  
         transaction.commit();  
         this.session.refresh(bean);  
         this.session.flush();  
  
      } catch (HibernateException he) {  
         throw new DaoException(he);  
      }  
   }