Java applet --> ClassNotFound Exception

Question

I'm learning Java and reading this book: https://www.fca.pt/cgi-bin/fca_main.cgi/?op=2&isbn=978-972-722-791-4.

In this book, I have a Java applet exercise. I can run it in Eclipse in appletviewer and works well. but I'm having trouble integrating the applet into HTML.

Here's my java code:

package packageteste;

import java.applet.Applet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.util.Date;

public class Relogio extends Applet implements Runnable{


    Date data;
    Thread proc;
    Font f = new Font("TimesRoman", Font.BOLD, 40);

    public void start(){

        proc = new Thread(this);
        proc.start();

    }

    public void stop(){

        proc = null;

    }

    @SuppressWarnings("static-access")
    @Override
    public void run() {

        Thread th = Thread.currentThread();
        while(proc == th){

            data = new Date();

            try{

                th.sleep(500);

            }catch(InterruptedException e){}

            repaint();

        }

    }

    public void paint(Graphics g){

        g.setFont(f);
        g.setColor(Color.GREEN);
        g.drawString(data.toString(),20,60);
    }}

And now here's my html code :

<!DOCTYPE html>
<html>


<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>


<body>
<applet code = "packageteste.Relogio.class" width="700"></applet>
</body>


</html>

1) Why code an applet? If it is due to the teacher specifying it, please refer them to Why CS teachers should stop teaching Java applets. 2) Why use AWT? See this answer for many good reasons to abandon AWT using components in favor of Swing. — Andrew Thompson
– Andrew Thompson, Commented Aug 11, 2015 at 12:03

Community · Accepted Answer · 2017-05-23 12:21:58Z

1

code = "packageteste.Relogio.class" must not include .class
If you have your applet built into a .jar file use the archive="..." attribute to tell the browser what .jar it is.
If you don't have a .jar make sure the class packageteste.Relogio can be found as Relogio.class in the packageteste directory.

See also here: How to specify correctly codebase and archive in Java applet?

edited May 23, 2017 at 12:21

CommunityBot

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answered Aug 10, 2015 at 15:05

JimmyB

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1 Comment

Andrew Thompson Over a year ago

Note 2 things. 1) An applet that is not digitally signed will have almost no chance of being successfully launched in a modern JRE. To be signed, code needs to be in a Jar. 2) <applet code = "packageteste.Relogio.class" width="700"></applet> besides removing the .class as mentioned in the answer, be sure to specify a height for the applet. It is a required attribute.

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