public void foo(){
    System.out.println("1");
    Service1Class.fooMethod1();
    System.out.println("2");
    Service2Class.fooMethod2();
}

public void foo(){
    Session session = HibernateUtil.getSessionFactory().openSession();//она не тут конечно могла открыться... 
    System.out.println("1");
    
    session.beginTransaction();
    Service1Class.fooMethod1();//будем считать, что внутри используется sesion
    session.getTransaction().commit();

    System.out.println("2");

    
    session.beginTransaction();
    Service2Class.fooMethod2();//будем считать, что внутри используется sesion
    session.getTransaction().commit();

 
}

propagation=Propagation.REQUIRED, rollbackFor=Exception.class

Session session1=Session.getCurrentSession();

Employee employee=Session1.get(Employee.class, 2); //retrieve employee having empId 2.employee return persistent object.

session1.close(); //transition is in detached state. Hibernate no longer manages the object.

employee.setName("Ron"); //Since it is in detached state so modification is ignored by Hibernate

Session session2=SessionFactory.getCurrentSession(); //reattach the object to an open session. Return persistent object and changes is saved to the database.
session2.update(employee);

session.getTransaction.commit(); //commit the transaction