LEarNINg...: Wicket: Steps to Create Hello World Application on Eclipse (JUNO).

Go to File àNew à Dynamic Web Project.

Enter project name as ‘wicket’ and click on next.

Again click on next.

Now select ‘Generate web.xml deployment descriptor’ and click Finish.

Now copy log4j-1.2.16.jar, slf4j-api-1.6.1.jar, slf4j-log4j12-1.6.1.jar, wicket-core-1.5.7.jar, wicket-request-1.5.7.jar and wicket-util-1.5.7.jar into WEB-INF/lib folder.

Now create new java file named HelloWorld.java extending WebPage in com.lnn.page package.

Add greeting label to HelloWorld.java

package com.lnn.page;

import org.apache.wicket.markup.html.WebPage;

import org.apache.wicket.markup.html.basic.Label;

public class HelloWorld extends WebPage {

private static final long serialVersionUID = -1674472041276604968L;

public HelloWorld(){

add(new Label("greeting", "Hello, World!"));

}

Create the HelloWorld.html file in com.lnn.page package. (same name as webpage file).

Now add header tag with greeting wicket id. (Here I have added wicket name space html tag for convenience).

<?xml version="1.0" encoding="UTF-8"?>

<html xmlns="http://www.w3.org/1999/xhtml"

xmlns:wicket="http://wicket.apache.org">

<body>

<h1 wicket:id="greeting">This is greeting from web page.</h1>

</body>

</html>

Create HelloWorldApplication by extending WebApplication in com.lnn.app package.

Return HelloWorld.class in getHomePage method.

package com.lnn.app;

import org.apache.wicket.Page;

import org.apache.wicket.protocol.http.WebApplication;

import com.lnn.page.HelloWorld;

public class HelloWorldApplication extends WebApplication {

@Override

public Class<? extends Page> getHomePage() {

// TODO Auto-generated method stub

return HelloWorld.class;

}

Now map the WicketFilter along applicationName initParam in web.xml.

<?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_3_0.xsd" id="WebApp_ID" version="3.0">

<display-name>wicket</display-name>

<filter-name>Application</filter-name>

<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>

<init-param>

<param-name>applicationClassName</param-name>

<param-value>com.lnn.app.HelloWorldApplication</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>Application</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

Right click on the project Go to àRun As’ à ‘Run on Server’ and click on Finish.

We will see the following window after Finish.

Tuesday, September 11, 2012

Wicket: Steps to Create Hello World Application on Eclipse (JUNO).

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