<mapping resource="com/imooc/model/Seller.hbm.xml"/>
   <mapping resource="com/imooc/model/Customer.hbm.xml"/>等语句的使用
  比如在这节课中，如果我创建了五条映射语句，<mapping resource="com/imooc/model/Seller.hbm.xml"/>
 <mapping resource="com/imooc/model/Customer.hbm.xml"/>
 <mapping resource="com/imooc/model/Commodity.hbm.xml"/>
 <mapping resource="com/imooc/model/Order.hbm.xml"/>
 <mapping resource="com/imooc/model/OrderItem.hbm.xml"/>
而没有创建对应的5个持久化类以及映射文件，只有商家和顾客两个。则junit测试

@Test

public void testFromClause(){

String hql = " from Customer ";

Query query = session.createQuery(hql);

List<Customer> customers = query.list();

for(Customer customer : customers){

System.out.println("name:"+customer.getName());

}

}

会抛出指示Query query = session.createQuery(hql);session.close();这两行有空指针异常

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