ClassNotFoundException when loading Applet in Java Web Application

Question

I'm trying to deploy Java Web Application (Spring, Hibernate, Maven, Tomcat, WinXp) with a very simple applet, but when I open jsp page with this applet I see ClassNotFountException Error.

The structure of my project (deployed):

myApp     
|--META-INF
|--WEB-INF
   |--classses
      |--ru
         |--mydomain
            |--applet
               |--FileChooserApplet.class
   |--views
      |--main.jsp
      |--index.html
|--resources

FileChooserApplet.class:

package ru.mydomain.applet;

import java.applet.Applet;

public class FileChooserApplet extends Applet {

    @Override
    public void paint(java.awt.Graphics g) {
        g.drawString("Weather is good!", 70, 70);
    }
}

main.jsp:

...
<body>
   <APPLET code="ru.mydomain.applet.FileChooserApplet.class"
           codebase="../classes" width=350 height=200></APPLET>
...
</body>
..

I tried to change codebase attribute to:

"classes"
"/classes"
""
delete this attribute

But, if i add the same code for applet to index.html and double-click on this file (URL in browser starts with file:///C:/projects/myApp/target/myApp/...) then applet works.

"..with a very simple applet," No such beast. At least, not when it comes to deploying them, as you have begun to discover. — Andrew Thompson
– Andrew Thompson, Commented Jul 25, 2013 at 14:40

Reimeus · Accepted Answer · 2014-02-06 12:28:43Z

4

AFAIK the applet will not have access to class files in WEB-INF/classes. These classes can only be accessed by server side resources such as servlets (as opposed to downloadable/static content).

You can jar all the class required for the applet to work and place the JAR file in the views folder. Your applet tag will look like

<APPLET code="ru.mydomain.applet.FileChooserApplet.class" 
        archive="mynewjar.jar"
        width=350 height=200>
</APPLET>

A single JAR file is a cleaner way to do deployments.

edited Feb 6, 2014 at 12:28

answered Jul 25, 2013 at 14:38

Reimeus

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2 Comments

Mikhail Panteleev Over a year ago

I made jar file with applet class, replaced it into resources folder, added attribute archive="resources/myApplet.jar" to <applet> tag and it works! Thank you!

sjakubowski Over a year ago

Thank you, other answers had the codebase attribute instead of archive and that changed got it working for me.

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