关于Hibernate出错的有关问题，多谢了

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.mmc.model.CBean;

public class Cservlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {        
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        
        CBean c = new CBean();        
        System.out.println("在servelet中");
        int id = Integer.parseInt(request.getParameter("id"));
        String name = request.getParameter("name");
        String title = request.getParameter("title");

        c.setID(id);
        c.setName(name);
        
        Configuration cfg = new Configuration();
        SessionFactory sf = cfg.configure().buildSessionFactory();
        Session session = sf.openSession();
        session.beginTransaction();
        
        session.saveOrUpdate(c);
        session.getTransaction().commit();
        session.close();
        sf.close();        
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}

……
<hibernate-mapping package="com.mmc.model">
    <class name="CBean" table="m"> 
        <id name="ID" column="id"> </id>
            <property name="name"></property>
    </class>
</hibernate-mapping>

<session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/a</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>

         <mapping resource="com/mmc/model/CBean.hbm.xml"/>    
        <!--<mapping class="com.mmc.model.DBean"/> -->

    </session-factory>