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Old July 6th, 2008, 01:14 AM
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Default Servlet Call Applet

Hi there,
 I'm new in Java. I have a servlet that want to call applet. It return ClassNotFoundException.
 My coding is below.
package com.csb.ocs.servlet;

import java.applet.Applet;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AppletCaller extends HttpServlet {
    private static final long serialVersionUID = 1858939761850073093L;

      static final int WIDTH = 450;
      static final int HEIGHT = 320;
      static final String APPLETNAME = "MainApplet";

      public void doGet(HttpServletRequest req, HttpServletResponse res)
                                   throws ServletException, IOException {
        ServletOutputStream out = res.getOutputStream();

        Applet applet = null;

        try {
          // Load the SecondApplet
          // Must be in the standard CLASSPATH
          try {
            applet = (Applet) Class.forName(APPLETNAME).newInstance();
          catch (Exception e) {
            throw new ServletException("Could not load applet:" + e);

          // Prepare the applet arguments
          String args[] = new String[1];
          args[0] = "barebones=true"; // run without a menu bar

          // Put the applet in its frame
          // addNotify() is called by MainFrameModified

        finally {
          // Clean up resources


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Old July 16th, 2008, 04:52 AM
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You cann't load an applet from inside servlet code. What you can do is write html code which has <applet/> tag to the response object in the servlet. so that the browser where you've called the servlet will parse the html containing <applet/> tag and loads it.

See the following links for more information about Applet-Servlet communication.

- Rakesh
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Old July 16th, 2008, 05:48 AM
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Forgot to mention to make applet communicate with servlet you need to sign the applet. By default applet is not allowed to open a socket or access filesystem for security reasons.

- Rakesh
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