package controllers;

import play.*;
import play.mvc.*;
import play.db.jpa.*;

import views.html.*;

public class Application extends Controller {
    public Result index() {
        return ok(index.render("Hello World!"));
    }

}

package controllers;

import play.*;
import play.mvc.*;
import play.db.jpa.*;

import views.html.*;

public class Application extends Controller {
    public Result index() {
        return ok(index.render("System started"));
    }

}

Replace Hello World with something more professional