“Servlet” (server-side) initialization code in GWT

Question

How can I have a single time initialization on a server side of GWT app?

I may be thinking to much like HttpServlet where you can override init()

Answer 1

You can add like mentioned in a comment a ServletContextListener.

public class ServerConfig implements ServletContextListener {

    public void contextInitialized(ServletContextEvent event) {
    // Do stuff on startup.
    }

    public void contextDestroyed(ServletContextEvent event) {
    // Do stuff on shutdown.
    }
}

Now put the new class on the server side, you also ave to register the Listener in your web.xml file :

path.to.class.ServerConfig