The browser doesn't have access to anything in your application's WEB-INF directory or its subdirectories, so putting the
applet there isn't going to work. Consider the applet class to be in the same category as Javascript and CSS files, and put it in the same sort of place. Make sure that it's in the my_package directory of your web application, and modify the "code" attribute in your HTML to specify the package as part of the class name.