EDIT

package eu.etaxonomy.cdm.vaadin.ui;

import java.util.logging.Logger;

import javax.servlet.annotation.WebServlet;

import com.vaadin.annotations.Theme;

import com.vaadin.annotations.VaadinServletConfiguration;

import com.vaadin.navigator.Navigator;

import com.vaadin.ui.UI;

import eu.etaxonomy.cdm.vaadin.servlet.CdmVaadinConversationalServlet;

import eu.etaxonomy.cdm.vaadin.view.NaviTestView;

@Theme("chameleon")

public class NavigatorTestUI extends AbstractAuthenticatedUI {

	Navigator navigator;

	private static final String FIRST_VIEW = "firstView";

	public static final String SECOND_VIEW = "secondView";

	private final static Logger logger =

			Logger.getLogger(NavigatorTestUI.class.getName());

	@WebServlet(value = {"/app-test/navi/*"}, asyncSupported = true)

	@VaadinServletConfiguration(productionMode = false, ui = NavigatorTestUI.class, widgetset = "eu.etaxonomy.AppWidgetSet")

	public static class Servlet extends CdmVaadinConversationalServlet {

	}

	@Override

	protected void doInit() {

		getPage().setTitle("Navigation Example");

		NaviTestView ntv1 = new NaviTestView();

		ntv1.setText("Congratulations! you have reached the first view. If you have got here without logging in there we are in trouble :)");

		NaviTestView ntv2 = new NaviTestView();

		ntv2.setText("Wow! you made it to the second view. Get yourself a beer - preferably a Krušovice Cerne");

		ntv2.removeButton();

        UI.getCurrent().getNavigator().addView(FIRST_VIEW, ntv1);  

        UI.getCurrent().getNavigator().addView(SECOND_VIEW, ntv2);  

	}

	@Override

	public String getFirstViewName() {

		return FIRST_VIEW;

	}

}