This add-on takes care of most of the technical details related to Java applet integration to a Vaadin application. The package includes a base Java applet class that implements threaded communication with GWT component as well as base widget and server-side API to embed the applet. AbstractApplet: A base class for an applet. Implements a threaded JavaScript communication mechanism. VAppletIntegration: Client-side Applet integration base for embedding and communicating with an applet. AppletIntegration: Server-side applet integration class. This is intended to be subclassed to integrate a custom applet to your Vaadin application. Implements the server API for applet communication. Remember, that to implement a privileged applet you need sign the applet jar. For example use case see the Screenshot add-on.