Spring 事务的传播行为有哪些？哪些情况下事务会失效？

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Service
public class AuditLogService {
    private final AuditLogMapper auditLogMapper; // MyBatis Mapper，定义省略

    public AuditLogService(AuditLogMapper auditLogMapper) {
        this.auditLogMapper = auditLogMapper;
    }

    @Transactional(propagation = Propagation.REQUIRES_NEW) // 独立提交，不受下单结果影响
    public void record(String message) {
        auditLogMapper.insert(message);
    }
}

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class OrderService {
    private final OrderMapper orderMapper; // MyBatis Mapper，定义省略
    private final StockMapper stockMapper; // 同上
    private final AuditLogService auditLogService; // 另一个 Bean，调用会经过它的代理

    public OrderService(OrderMapper orderMapper, StockMapper stockMapper, AuditLogService auditLogService) {
        this.orderMapper = orderMapper;
        this.stockMapper = stockMapper;
        this.auditLogService = auditLogService;
    }

    // StockException 是继承 Exception 的受检异常，不加 rollbackFor 时抛出它事务会提交
    @Transactional(rollbackFor = Exception.class)
    public void placeOrder(long productId, int quantity) throws StockException {
        orderMapper.insert(productId, quantity);
        try {
            auditLogService.record("下单，商品 " + productId);
        } catch (RuntimeException e) {
            // 日志写失败只回滚日志自己的事务，下单继续
        }
        // 条件更新：UPDATE stock SET num = num - ? WHERE product_id = ? AND num >= ?，返回影响行数
        if (stockMapper.deduct(productId, quantity) == 0) {
            throw new StockException("库存不足"); // 订单回滚；上面已经独立提交的日志保留
        }
    }
}