无法解析映射文件

Question

映射文件中有一些我找不到的问题。它给出了NullPointerException

试图更改标签。问题仍然存在。映射文件在下面。

<hibernate-mapping>
<class name = "model.Order" table = "USER_ORDER">

<id name = "orderId" type = "int" column = "ID" not-null = "true">
<generator class = "native"/>
</id>

<property name = "quantity" type = "int" column = "QUANTITY"/>
<property name = "cost" type = "int" column = "COST"/>
<property name = "status" type = "boolean" column = "STATUS"/>
<property name = "createdDate" type = "string" column = "CREATED"/>
<property name = "modifiedDate" type = "string" column = "MODIFIED"/>

<many-to-one name = "user" class = "model.User" column = "USER_ID"   
cascade = "save-update"  not-null = "true"/>
<set name = "orderDetail" cascade = "save-update" inverse = "false">
<key column = "ORDER_ID" not-null = "true"/>
<one-to-many class = "model.OrderDetails"/>
</set>

</class>
</hibernate-mapping>

  

数据库连接创建失败：无法解析映射
      文件：/mapping/Order.hbm.xml（资源）       线程“主”中的异常java.lang.NullPointerException         在db.DatabaseConnectionH.getSession（DatabaseConnectionH.java:39）         在dao.CartDao.getCarts（CartDao.java:72）         在services.CartServices.getUserCarts（CartServices.java:55）         在controller.CartController.checkCarts（CartController.java:214）         在MainMenu.main（MainMenu.java:87）