Hibernate初学，出现问题求教

[guipan0464]

在学习hibernate做1对多关联实验的时候
我用mysql建了两张表;第一张customer表属性有{id,name}
第二种orders表属性有{id,address,price,cid}
我把cid作为第一张表的外键

Customer.hbm.xml的代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class name="cn.itcast.onetomany.Customer" table="customer">
<id name="id" column="id">
<generator class="native">
</generator></id>
<!-- 配置普通属性 -->
<property name="name" length="20"/>

<!-- 一对多的关系使用set集合映射 -->
<set name="orders">
<!-- 确定关联的外键列 -->
<key column="cid"/>
<!-- 映射到关联属性 -->
<one-to-many class="cn.itcast.onetomany.Order"/>
</set>
</class>
</hibernate-mapping>



这是Order.hbm.xml的代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
<class name="cn.itcast.onetomany.Order" table="orders">
<id name="id" column="id">
<generator class="native"></generator>
</id>
<!-- 普通属性 -->
<property name="address" length="50"/>
<property name="price"/>
<!-- 多对一关系映射 -->
<many-to-one name="customer" class="cn.itcast.Customer" column="cid"/>
</class>
</hibernate-mapping>

这是我的测试程序：
//添加数据
@Test
public void test1(){
Session session=HibernateUtils.getSession();
session.beginTransaction();
//1、创建第一个客户
Customer c=new Customer();
c.setName("张三");
//2、创建两个订单
Order o1=new Order();
o1.setAddress("武汉");
o1.setPrice(10000.00);
Order o2=new Order();
o2.setAddress("广州");
o2.setPrice(5000.00);
//3、描述关系————订单属于某个客户
o1.setCustomer(c);
o2.setCustomer(c);
//4、描述关系————客户有多个订单
c.getOrders().add(o1);
c.getOrders().add(o2);
//5、先保存客户再存订单
session.save(c);
session.save(o1);
session.save(o2);
session.getTransaction().commit();
session.close();
System.out.println(c);
}

我照着书上的案例做的，但还是出现了这样的异常
java.lang.ExceptionInInitializerError
at cn.itcast.onetomany.OneToManyTest.test1(OneToManyTest.java:13)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.MappingException: An association from the table orders refers to an unmapped class: cn.itcast.Customer
at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1794)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1726)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1393)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1826)
at cn.itcast.utils.HibernateUtils.<clinit>(HibernateUtils.java:15)
... 24 more
想请教下大家我的问题是什么？我刚学还不知道如何排查问题，我觉得应该是配置的问题或者我的底层表建的不对？

[qq_29563255]

1首先多对一关联映射,维护外键的是在多的一方,需要在多的一需要加inverse,2配置casecade,保存一方会自动保存另一方

[from me to us]

不知道错那,那就先把第一句话 翻译过来 自己看下可好 ,这种报错你会找到 它提示你哪行报错的 你好好看下

[自由自在_Yu]

cn.itcast.onetomany.Customer cn.itcast.Customer 创建了两个Customer类？