Navigator в Vaadin

Navigator navigator = new Navigator(this, this);

public class MyUI<T> extends UI implements View {
 
    Navigator navigator;
    // protected static final String MAINVIEW = "main";
 
    final VerticalLayout layout = new VerticalLayout();
    final MenuBar menu = new MenuBar();
        layout.addComponents(menu);
 
    @Override
    protected void init(VaadinRequest vaadinRequest) {
 
        //navogator
    
        getPage().setTitle("ui");
        navigator = new Navigator(this, this);
        
        getNavigator().addView("category", new CategoryView());
        getNavigator().addView("hotel", new MyUI());
        
 
        setContent(layout);
    }
}

public class CategoryView implements View {
 
    final Grid<String> categooryGrid = new Grid<String>();
    
    
    protected void init(VaadinRequest arg0) {
        
    
        layout.addComponents(menu, categooryGrid);
        categooryGrid.setColumnOrder("name");
        }
}

Navigator navigator = new Navigator(this, this);

public class NavigatorUI extends com.vaadin.ui.UI {
 
    Navigator navigator;
    
    @Override
    protected void init(VaadinRequest req) {
        
            navigator = new Navigator(this, this);
            
            getNavigator().addView("category", new CategoryView());
            getNavigator().addView("hotel", new MyUI());
    }
 
}