Could not parse mapping document from resource跟Duplicate class/entity mapping

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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="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/test
</property>
<property name="connection.username">root</property>
<property name="connection.password">wsmysql</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="myeclipse.connection.profile">MySQL</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping resource="S.hbm.xml" />
</session-factory></hibernate-configuration>
S.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping>  
   <class name="S" table="s">  
      <!-- id元素定义了属性到数据库表主键字段的映射。-->  
      <id name="sno" type="java.lang.Integer">  
      <!-- 用来为该持久化类的实例生成唯一的标识 -->  
      <generator class="native"/>  
      </id>  
      <!-- property元素为类声明了一个持久化的，JavaBean风格的属性-->  
      <property name="sname"  type="java.lang.String"></property>
  </class>
</hibernate-mapping>