小女子不才，接触J2EE/EJB不久碰到的问题！跪求帮助！！！

另外，这是那个出错的源码，一个applet,一个servlet,相互之间进行通信，请明示啦！package app;import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;public class sendapplet extends Applet implements ActionListener {
    Label sendlable;
    Label messageInfo;
    Button sendButton;
    TextField sendText;
    TextField messageText;
    URLConnection connect;
    String message;
    URL chatURL;    public String getAppletInfo() {
        return "this   is   a   applet--servlet";
    }    public synchronized void init() {
        super.init();
        resize(500, 300);
        sendlable = new Label("Please   enter   Massage");
        messageInfo = new Label("What   you   hava   send:");
        sendText = new TextField(40);
        sendButton = new Button("Send");
        messageText = new TextField(40);
        messageText.setEditable(true);
        //     
        //     
        Panel mainp = new Panel();
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 0;
        gbc.weighty = 0;
        gbc.gridy = 0;
        gbc.gridx = 0;
        gbc.gridwidth = 10;
        gbc.gridheight = 1;
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.NONE;
        mainp.setLayout(gbl);
        gbl.setConstraints(sendlable, gbc);
        mainp.add(sendlable);
        gbc.gridy = 1;
        gbc.gridwidth = 9;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbl.setConstraints(sendText, gbc);
        mainp.add(sendText);
        gbc.gridx = 9;
        gbc.gridwidth = 1;
        gbc.fill = GridBagConstraints.NONE;
        gbl.setConstraints(sendButton, gbc);
        mainp.add(sendButton);
        gbc.gridx = 0;
        gbc.gridy = 2;
        gbc.gridwidth = 10;
        gbl.setConstraints(messageInfo, gbc);
        mainp.add(messageInfo);
        gbc.gridy = 3;
        gbc.weighty = 100;
        gbc.gridheight = 10;
        gbc.fill = GridBagConstraints.BOTH;
        gbl.setConstraints(messageText, gbc);
        mainp.add(messageText);
        sendButton.addActionListener(this);
        //构造的panel加入到applet中     
        setLayout(new BorderLayout());
        add("Center", mainp);
        chatURL = getCodeBase();
    }    public synchronized void start() {
    }    public synchronized void stop() {
    }    public synchronized void destroy() {
    }    //         private void Send() {
        message = sendText.getText();
        //清除用户的输入信息
        sendText.setText("");
        showStatus("Message send!");
        //把输入的字符串转化为 x-www-form-urlencoded 格式
        String queryString = 
            "http://192.168.1.194:8988/ch01-app-context-root/receive?message=" +message; //URLEncoder.encode(message);
        
        p("Attempting to send:" + message);
        //建立与Servlet的联接，并取得Servelt的输出信息
        try {
            connect = (new URL(chatURL, queryString)).openConnection();
            showStatus("open connection!");
            //下次连接不用Cache
            connect.setDefaultUseCaches(false);
            //这次连接也不用Cache
            connect.setUseCaches(false);
            //打开淂流用于读数据
            connect.setDoInput(true);
            //不能用于写数据
            connect.setDoOutput(false);
            //服务器与客户的真正连接
            connect.connect();
            p("Made connection to " + connect);
            //Made connection to 
  //sun.net.www.protocol.http.HttpURLConnection:http://192.168.1.194:8988/a1-Project1-context-root/Riceive?message=aff
            showStatus("Open Stream!");
            DataInputStream in = new DataInputStream(connect.getInputStream());
            showStatus("reading!");
            message = in.readLine();
            while (message != null) {
                //在消息文本框显示Servlet生成的信息
                messageText.setText(message);
                message = in.readLine();
               // 
            } //end   while     
        } //end   try     
        catch (MalformedURLException e2) {
            System.err.println("Malformedurlexception:" + e2.toString());        } //end   catch     
        catch (IOException e1) {
            System.err.println(e1.toString());
            System.out.println(chatURL.getPath());
            System.out.println(URLEncoder.encode(message));
        }
    } //end   Send         public void actionPerformed(ActionEvent e) {
        if (e.getSource() == sendButton) {
            Send();
        }
    }    private void p(String debug) {
        messageText.setText(debug);
        //System.out.println("app-servlet:"+debug);     
    }
}package app;
import java.io.*;import java.util.Date;import javax.servlet.*;
import javax.servlet.http.*;/**/
public class Receive extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }
    // public   void   Riceive //  extends   HttpServlet     
    // { /*        public void service(HttpServletRequest req, 
                        HttpServletResponse res) throws ServletException, 
                                                        IOException {
        res.setContentType("text/plain");
        ServletOutputStream out = res.getOutputStream();
        out.print("receive   user   message:");
        out.print(req.getParameter("message"));
    } //end   service 
}