component holds a nested hierarchy of stateful components, where each component's model is, in the end, a POJO (Plain Old Java Object) Wicket aims for simplicity. There are no configuration files to learn in Wicket. Wicket is a simple class library with a consistent approach to component structure. Example A Hello World Wicket application, with four files: HelloWorld.html The XHTML template. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:wicket="http://wicket.apache.org/dtds.data/wicket-xhtml1.3-strict.dtd" xml:lang="en" lang="en"> <body> <span wicket:id="message" id="message">Message goes here</span> </body> </html> HelloWorld.java The page component that will be bound to the template. It, in turn, binds a child component (the Label component named "message"). package org.wikipedia.wicket; import org.apache.wicket.markup.html.WebPage; import org.apache.wicket.markup.html.basic.Label; public class HelloWorld extends WebPage { /** * Constructor */ public HelloWorld() { add(new Label("message", "Hello World!")); } } HelloWorldApplication.java The main application class, which routes requests for the homepage to the HelloWorld page component. package org.wikipedia.wicket; import org.apache.wicket.protocol.http.WebApplication; public class HelloWorldApplication extends WebApplication { /** * Constructor. */ public HelloWorldApplication() { } /** * @see org.apache.wicket.Application#getHomePage() */ public Class getHomePage() { return HelloWorld.class; } } web.xml The servlet application Deployment Descriptor, which installs Wicket as the default handler for the servlet and arranges for HelloWorldApplication to be instantiated at startup. <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Wicket Example</display-name> <filter> <filter-name>HelloWorldApplication</filter-name> <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class> <init-param> <param-name>applicationClassName</param-name> <param-value>org.wikipedia.wicket.HelloWorldApplication</param-value> </init-param> </filter> <filter-mapping> <filter-name>HelloWorldApplication</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app> Components Basic components like form, links, repeaters, and so on are built-in. Releases See also Vaadin Tapestry Click ZK Richfaces Echo References Notes External links Java enterprise platform Free software programmed in Java (programming language) Web frameworks Wicket