package com.vaadin.tests.extensions; import com.vaadin.server.AbstractClientConnector; import com.vaadin.server.AbstractExtension; import com.vaadin.server.VaadinRequest; import com.vaadin.tests.components.AbstractTestUI; import com.vaadin.ui.Label; public class UnknownExtensionHandling extends AbstractTestUI { // Extension without @Connect counterpart public static class MyExtension extends AbstractExtension { @Override public void extend(AbstractClientConnector target) { super.extend(target); } } @Override protected void setup(VaadinRequest request) { Label label = new Label( "A label with a missing extension, should cause sensible output in the debug window / browser console"); MyExtension extension = new MyExtension(); extension.extend(label); addComponent(label); } }