Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.vaadin.server; import com.vaadin.ui.UI; public class DefaultUIProvider extends UIProvider { @Override public Class<? extends UI> getUIClass(UIClassSelectionEvent event) { VaadinRequest request = event.getRequest(); String uiClassName = request.getService().getDeploymentConfiguration().getUIClassName(); if (uiClassName != null) { ClassLoader classLoader = request.getService().getClassLoader(); try { Class<? extends UI> uiClass = Class.forName(uiClassName, true, classLoader).asSubclass(UI.class); return uiClass; } catch (ClassNotFoundException e) { throw new RuntimeException("Could not find UI class", e); } } return null; } }