package com.vaadin.tests.application; import com.vaadin.server.VaadinRequest; import com.vaadin.tests.components.AbstractTestUIWithLog; import com.vaadin.ui.Button; public class ResynchronizeUI extends AbstractTestUIWithLog { @Override protected void setup(VaadinRequest request) { Button b = new Button("Resynchronize", event -> { // Theme change is currently the only operation which always // does resynchronize setTheme("runo"); log("Set theme to runo"); }); addComponent(b); } }