public class Controller {
    public AService aService = new AService();
    public BService bService = new BService();

    public void doSomething(SomeData data) {
        //Transaction transaction = HibernateUtil.getSession().openTransaction();
        aService.save(data.getSomeVar1());
        bService.save(data.getSomeVar2());
        //transaction.commit(); or optional try-catch with rollback
    }
}