### Question:
OrderService { @Transactional public void method02() { OrderDO order = orderRepository.findById(1).orElse(null); System.out.println(order); UserDO user = userRepository.findById(1).orElse(null); System.out.println(user); }  void method01(); @Transactional // 报错，找不到事务管理器 void method02(); void method03(); @Transactional(transactionManager = DBConstants.TX_MANAGER_ORDERS) void method031(); @Transactional(transactionManager = DBConstants.TX_MANAGER_USERS) void method032(); @Transactional(transactionManager = DBConstants.TX_MANAGER_ORDERS) void method05(); @Transactional(transactionManager = DBConstants.TX_MANAGER_USERS, propagation = Propagation.REQUIRES_NEW) void method052();  }### Answer:
@Test public void testMethod02() { orderService.method02(); }