求 解 关于servlet 中用hibernate 出错

package cn.cui.database;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

public class HibernateUtil {
private static SessionFactory factory;
static {//
Configuration cfg = new Configuration();
cfg.configure("/hibernate.cfg-mysql.xml");
factory = cfg.buildSessionFactory();
}

public static Session openSession() {
    return factory.openSession();
}

}

package cn.cui.servlet;

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 cn.cui.database.HibernateUtil;

import com.google.gson.Gson;

/**

  • Servlet implementation class PositionServlet
    */
    public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    private String result;

    public LoginServlet() {
    super();
    // TODO Auto-generated constructor stub
    }

    @Override
    protected void doGet(HttpServletRequest request,
    HttpServletResponse response) throws ServletException, IOException {
    this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request,
    HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html;charset=utf-8");
    request.setCharacterEncoding("utf-8");
    response.setCharacterEncoding("utf-8");
    String name = request.getParameter("n");
    String group = request.getParameter("g");
    String pwd = request.getParameter("p");
    System.out.println(name);

        result = selectUserInfo(name, group, pwd);
    
    PrintWriter out = response.getWriter();
    //
    Gson gson = new Gson();
    String jsonString = gson.toJson(result); // 用Gson方式 把object 保存为json字符
    
    out.write(jsonString);
    out.flush();
    out.close();
    

    }

    private String selectUserInfo(String name, String group, String pwd) {
    // 查询
    org.hibernate.Session ssn = HibernateUtil.openSession();
    // String hql = "from GroupInfo where group=:a";
    Query q = ssn.createQuery(hql);
    q.setString("a", group);
    List list = q.list();
    for (GroupInfo s : list) {
    String password = s.getPassword();
    }
    }
    }

访问:http://localhost:8080/Server/login?n=name&g=group&p=pwd

错误:严重: Servlet.service() for servlet [LoginServlet] in context with path [/Server] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.hibernate.HibernateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at cn.cui.servlet.LoginServlet.selectUserInfo(LoginServlet.java:64)
at cn.cui.servlet.LoginServlet.doPost(LoginServlet.java:46)
at cn.cui.servlet.LoginServlet.doGet(LoginServlet.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

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