jsp服务器classes访问错误问题

Question

AbstractMethodError
可能你servlet中的init()之类的方法没实现？
你把你的源代码贴出来了

Answer 1

代码如下：
请多多指教
//package EIIE.Public;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import EIIE.db.DataSetBean;
import EIIE.Public.*;public class Login extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";
    private DataSetBean DSBobj;
    private String UserId,Password;
    private int RecordCount;
    private HttpSession session;
    private Count userCount;
    /**Initialize global variables*/
    public void init() throws ServletException {
    }
    /**Process the HTTP Get request*/
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
    }
    /**Process the HTTP Post request*/
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        session = request.getSession();
        userCount = new Count();
        //out.println("<script>alert('"+request.getRemoteAddr()+"')</script>");
        out.println("<script language=Javascript src=/EIIE/Resource/JavaScript/common.js></script>");
        try
        {
          DSBobj = new DataSetBean();
          UserId = request.getParameter("Username").trim();
      Password = request.getParameter("Password").trim();
          String Filter = "Id = '"+UserId+"' and Password = '"+Password+"'";
          DSBobj.init("storeproc","CheckUser","",UserId+"&"+Password);
      RecordCount = DSBobj.execute();
      if (RecordCount == 1)
      {
        int r = userCount.add(UserId);
            if (r == 0)
            {
              session.setAttribute("UserId",UserId);
          DSBobj.next();
          session.setAttribute("Name",DSBobj.getFieldAsString("Name"));
          out.println("<script>window.open('/EIIE/Main.jsp',杉德仓库管理系统,''fullscreen=0,toolbar=1,location=1,directories=1,status=1,menubar=no,scrollbars=yes,resizable=1,width=780,height=580'')</script>");
            }
            else if (r == 1)
            {
          out.println("<script>ShowErrorDlg('在线用户数已经满，登录失败')</script>");
            }
            else
            {
              out.println("<script>ShowErrorDlg('用户已经在线了，登录失败')</script>");
            }
          }
      else
      {
        Filter = "Id = '"+UserId+"'";
        DSBobj.init("table","user",Filter,"");
        RecordCount = DSBobj.execute();
        if (RecordCount == 0)
        {
          out.println("<script>ShowErrorDlg('用户名错误')</script>");
          out.println("<script>history.go(-1)</script>");
        }
            else
        {
              out.println("<script>ShowErrorDlg('口令错误')</script>");
          out.println("<script>history.go(-1)</script>");
        }
          }
          DSBobj.close();
        }
        catch(EIEException e)
        {
          out.println("<script>ShowErrorDlg('"+e.message()+"')</script>");
      out.println("<script>history.go(-1)</script>");
        }
        finally
        {
          DSBobj = null;
        }
        //out.println("<script>alert("+userCount.getCount()+")</script>");
        out.println("<script>location.replace('/EIIE/Login.jsp')</script>");    }
    /**Clean up resources*/
    public void destroy() {
    }
}

Answer 2

我从tomcat日志中发现如下错误，和migrant1119(候鸟) 说的一致。
Context log: path="/EIIE" Class Not Found in init
 java.lang.ClassNotFoundException: org.apache.jasper.servlet.JspServlet
at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java:450)
at org.apache.tomcat.loader.AdaptiveServletLoader.loadClass(AdaptiveServletLoader.java:141)
at org.apache.tomcat.core.ServletWrapper.initServlet(ServletWrapper.java:294)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:445)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)
at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)
at java.lang.Thread.run(Thread.java:484)

Answer 3

你的init()中是否应该加上super()句呢？