Hibernate框架中的，could not find the main class 的有关问题

Hibernate框架中的，could not find the main class 的问题
实体类如下：
com.mys.model

package com.mys.model;

// default package


import java.util.Date;



/**

 * User entity. @author MyEclipse Persistence Tools

 */


public class User  implements java.io.Serializable {



    // Fields    


     private String id;

     private String userName;

     private String userPwd;

     private String sex;

     private Integer age;

     private String jiguan;

     private Date userRegisterTime;



    // Constructors


    /** default constructor */

    public User() {

    }


	/** minimal constructor */

    public User(String id, String userName, String userPwd, Date userRegisterTime) {

        this.id = id;

        this.userName = userName;

        this.userPwd = userPwd;

        this.userRegisterTime = userRegisterTime;

    }

    

    /** full constructor */

    public User(String id, String userName, String userPwd, String sex, Integer age, String jiguan, Date userRegisterTime) {

        this.id = id;

        this.userName = userName;

        this.userPwd = userPwd;

        this.sex = sex;

        this.age = age;

        this.jiguan = jiguan;

        this.userRegisterTime = userRegisterTime;

    }


   

    // Property accessors


    public String getId() {

        return this.id;

    }

    

    public void setId(String id) {

        this.id = id;

    }


    public String getUserName() {

        return this.userName;

    }

    

    public void setUserName(String userName) {

        this.userName = userName;

    }


    public String getUserPwd() {

        return this.userPwd;

    }

    

    public void setUserPwd(String userPwd) {

        this.userPwd = userPwd;

    }


    public String getSex() {

        return this.sex;

    }

    

    public void setSex(String sex) {

        this.sex = sex;

    }


    public Integer getAge() {

        return this.age;

    }

    

    public void setAge(Integer age) {

        this.age = age;

    }


    public String getJiguan() {

        return this.jiguan;

    }

    

    public void setJiguan(String jiguan) {

        this.jiguan = jiguan;

    }


    public Date getUserRegisterTime() {

        return this.userRegisterTime;

    }

    

    public void setUserRegisterTime(Date userRegisterTime) {

        this.userRegisterTime = userRegisterTime;

    }


}

业务类如下：
com.mys.util

package com.mys.util;

	/**

	 * 我们必须启动Hibernate，此过程包括创建一个全局的SessoinFactory，并把它储存在应用程序代码容易访问的地方。

	 */


import java.util.List;


import com.mys.model.*;


import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

public class HibernateUtil{


 private static final SessionFactory sessionFactory;


	    static {

	        try {

	            // Create the SessionFactory from hibernate.cfg.xml

	           //以前hibernate文档里的： sessionFactory = new Configuration().configure().buildSessionFactory();

	            

	             Configuration config=new Configuration();

	              config.configure();

	             config.addClass(User.class);//完整类名?

	             sessionFactory=config.buildSessionFactory();

	            

	        } catch (Throwable ex) {

	            // Make sure you log the exception, as it might be swallowed

	            System.err.println("Initial SessionFactory creation failed." + ex);

	            throw new ExceptionInInitializerError(ex);

	        }

	    }


	  

//	     查询用户信息

	     public void showUsers()

	     {

	     Session session = sessionFactory.openSession();

	     Transaction tx=null;

	     try{

	      tx=session.beginTransaction();

	     Query query=session.createQuery("from tb_User as u");

	     List list=query.list();//List是util.*类库里的接口

	     System.out.println("id"+"用户名"+"用户密码"+"性别"+"年龄"+"籍贯"+"注册时间");

	     for(int i=0;i<list.size();i++)

	     {

	     User u=(User)list.get(i);

	     System.out.print(u.getId());

//	     省略部分

	     System.out.print(u.getUserName());

	     System.out.print(u.getUserPwd());

	     System.out.print(u.getSex());

	     System.out.print(u.getAge());

	     System.out.print(u.getJiguan());

	     System.out.print(u.getUserRegisterTime());

	     System.out.println("");

	     }

	     tx.commit();

	     }

	     catch(Exception e){

	     e.printStackTrace();

	     }finally{

	     session.close();

	     }

	     }

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		HibernateUtil h=new HibernateUtil();

     	h.showUsers();

	}


}

配置文件hibernate.cfg.xml如下：

<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

          "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

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

<hibernate-configuration>


	<session-factory>

		<property name="dialect">

			org.hibernate.dialect.MySQLDialect

		</property>

		<property name="connection.url">

			jdbc:mysql://localhost:3306/db_test

		</property>

		<property name="connection.username">root</property>

		<property name="connection.password">425175</property>

		<property name="connection.driver_class">

			com.mysql.jdbc.Driver

		</property>

		<property name="myeclipse.connection.profile">

			com.mysql.jdbc.Driver

		</property>

		<mapping resource="./User.hbm.xml" />


	</session-factory>


</hibernate-configuration>

映射文件在src目录下User.hbm.xml：

<?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 ">

<!-- 

    Mapping file autogenerated by MyEclipse Persistence Tools

-->

<hibernate-mapping>

    <class name="User" table="db_user" catalog="db_test">

        <id name="id" type="java.lang.String">

            <column name="id" length="15" />

            <generator class="assigned"></generator>

        </id>

        <property name="userName" type="java.lang.String">

            <column name="userName" length="20" not-null="true" />

        </property>

        <property name="userPwd" type="java.lang.String">

            <column name="userPwd" length="20" not-null="true" />

        </property>

        <property name="sex" type="java.lang.String">

            <column name="sex" length="4" />

        </property>

        <property name="age" type="java.lang.Integer">

            <column name="age" />

        </property>

        <property name="jiguan" type="java.lang.String">

            <column name="jiguan" length="20" />

        </property>

        <property name="userRegisterTime" type="java.util.Date">

            <column name="userRegisterTime" length="10" not-null="true" />

        </property>

    </class>

</hibernate-mapping>

我想用Hibernate实现一个查询数据库里所有数据的功能，映射文件和实体类都是自动生成的，业务类是自己参照着数编写的。
错误如下：
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Initial SessionFactory creation failed.org.hibernate.InvalidMappingException: Could not parse mapping document from resource ./User.hbm.xml
java.lang.ExceptionInInitializerError
at com.mys.util.HibernateUtil.<clinit>(HibernateUtil.java:32)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource ./User.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:569)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1587)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1555)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1534)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1508)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1428)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1414)
at com.mys.util.HibernateUtil.<clinit>(HibernateUtil.java:25)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from input stream
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:508)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:566)
... 7 more
Caused by: org.dom4j.DocumentException: http://hibernate.org/dtd/hibernate-mapping-3.0.dtd%20 Nested exception: http://hibernate.org/dtd/hibernate-mapping-3.0.dtd%20
at org.dom4j.io.SAXReader.read(SAXReader.java:484)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:499)
... 8 more
Exception in thread "main" 
------解决思路----------------------
异常信息中没有：could not find the main class