在Spring MVC和Hibernate中如何在单个事务中管理从服务层到DAO的两个方法调用

@Service
public class UserService {
    
    @Autowired
    private UserDao userDao;
    
    @Transactional
    public void createUser(User user) {
        // 业务逻辑处理
        userDao.save(user);
    }
    
    @Transactional
    public void updateUser(User user) {
        // 业务逻辑处理
        userDao.update(user);
    }
}

<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
        <tx:method name="*" propagation="REQUIRED" />
    </tx:attributes>
</tx:advice>

<aop:config>
    <aop:pointcut id="serviceMethods" expression="execution(* com.example.service.*.*(..))" />
    <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethods" />
</aop:config>

@Service
public class UserService {
    
    @Autowired
    private UserDao userDao;
    
    @Transactional
    public void createUser(User user) {
        // 业务逻辑处理
        userDao.save(user);
    }
    
    @Transactional
    public void updateUser(User user) {
        // 业务逻辑处理
        userDao.update(user);
    }
}