严重: Servlet.service() for servlet action threw exception
java.lang.NoClassDefFoundError: org/hibernate/HibernateException
    at StrutsFormPackage.ClassesOper.getAllStu(ClassesOper.java:17)
    at StrutsFormPackage.IndexAction.execute(IndexAction.java:47)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
    at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
    at java.lang.Thread.run(Thread.java:595)

//环境j2ee 1.4 jstl1.1 hibernate3 struts1.2 eclipse3.1.1 Myeclipse4.1
//JDK1.5 tomcat5.5

//strust -action.do
public ActionForward execute(
        ActionMapping mapping,
        ActionForm form,
        HttpServletRequest request,
        HttpServletResponse response) throws Exception{
        IndexActionForm indexActionForm = (IndexActionForm) form;
        String temS = indexActionForm.getIndexTemStr();
        
        Iterator i = null;
        if(temS.equals("clas")){
            i = i = ClassesOper.getAllStu();
            request.setAttribute("index",i);
        
        }else{
            request.setAttribute("index",null);
        }
        
        return mapping.findForward("index");
    }

//ClassesOper.getAllStu();
public static Iterator getAllStu(){
        return DAOclasses.getAllStu().iterator();
    }

//HibernateUtil.currentSession();
//HibernateUtil操作类

//hibernate-persistence
public static List getAllStu() {
        List list=null;
        try {
            session = HibernateUtil.currentSession(); //开启连接
            Transaction tx = session.beginTransaction(); //开启事务
            Query q=session.createQuery("from Classes_table");
            list=q.list();
            tx.commit();

        } catch (HibernateException e) { //捕捉例外
            e.printStackTrace();
        }finally
        {
            HibernateUtil.closeSession(session);
        }
        return list;

    }