简单的hibernate,高手指点.. 我是新手

package hibernate.ch01;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.*;
//测试类
public class HibernateTest {

/**
* @param args
*/
public static void main(String[] args) {

SessionFactory sessions=new Configuration().configure().buildSessionFactory();
Session session=sessions.openSession();
Transaction tx=null;
try{
tx=session.beginTransaction();
UserInfo u=new UserInfo();
u.setUserName("zzx");
u.setPassword("123");
System.out.println("开始插入数据");
session.save(u);
UserInfo u1=(UserInfo)session.load(UserInfo.class, new Integer(1));
System.out.println("用户为:" +u1.getUserName());
tx.commit();
tx=null;
System.out.println("结束");
}
catch(Exception ex)
{
ex.printStackTrace();
if(tx!=null)
tx.rollback();
}
finally
{
session.close();
}
}
}

//================javabean========
package hibernate.ch01;

public class UserInfo {

private Integer id;
private String userName;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}

}
//=======UserInfo.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="hibernate.ch01.UserInfo" table="login">
<id name="id" type="integer">
<column name="id"/>
<generator class="identity"/>
</id>
<property name="userName" type="string">
<column name="name" length="100"/>
</property>
<property name="password" type="string">
<column name="password" length="100"/>
</property>
</class>
</hibernate-mapping>



//===hibernate.cfg.xml


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>

<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.password">Zhouzongxi</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

</session-factory>

</hibernate-configuration>

Myelicpse开发的驱动导入了，下面的是运行的结果

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
开始插入数据
org.hibernate.MappingException: Unknown entity: hibernate.ch01.UserInfo
at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:569)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1086)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:83)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:481)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
at hibernate.ch01.HibernateTest.main(HibernateTest.java:24)


//哪位能耐心的给我讲下么..自学的.