求 解 关于servlet 中用hibernate 出错

Question

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)