java applet class not found exception in the chrome browser

Question

I am trying to run Java applet using Google Chrome browser. Everytime I am getting no class found exception. Here is my code.

HelloWorld.java

package my.first.pack;

import java.applet.Applet;
import java.awt.*;

public class HelloWorld extends Applet {

    /**
     * 
     */
    private static final long serialVersionUID = 2741715258812838900L;

    public void paint(Graphics g) {
        g.drawString("welcome", 150, 150);
    }

}

Hello.html

<applet code="my.first.pack.HelloWorld" width="300" height="300">

Show the directory structure of the server containing the HTML and class file (and their locations relative to each other). @VickyThakor alluded to something that must be fixed eventually, in that the class needs to be in a (signed) Jar these days in order to have any chance of working. As an aside, Chrome is soon to drop all support for the NPAPI that launches (among other things) applets. But .. — Andrew Thompson
– Andrew Thompson, Commented Jun 18, 2015 at 9:29
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. — Andrew Thompson
– Andrew Thompson, Commented Jun 18, 2015 at 9:29

Community · Accepted Answer · 2017-05-23 10:30:31Z

Sign your applet and all the .jar dependencies with a certificate.
Populate your manifest with all the tags mentioned below (it's in xml because I use maven, you can write in the way you prefer)

<codebase>http://location.of.your.jar/</codebase>
<permissions>all-permissions</permissions>
<Application-Library-Allowable-Codebase>http://location.of.your.jar/</Application-Library-Allowable-Codebase>
<Manifest-Version>1.0</Manifest-Version>
<Implementation-Title>App Name</Implementation-Title>
<Implementation-Version>0.1.0</Implementation-Version>
<Application-Name></Application-Name>
<Created-By>1.8.0_45</Created-By>
<Main-Class>package.YourClass</Main-Class>
<mode>development (or production)</mode>
<url>url of the application</url>

Surround your java method with the doPrivileged
Be sure that your browser has the java plugin enabled
Put your http path of your web app in the java exception list
If your url has _ (underscore/underline) probably it won't be recognized.
Try to move your .jar to the same folder of your html, not using the /applet folder.
Take a look on this post, I was having a similar issue.

Remember, this error saying that 'is not a function' is because your .jar is not loading - or you made something wrong with the js syntax, what I don't think so.

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