problem in running first wicket application

I have developed wicket application with
HelloWorld.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<span wicket:id="message" >Message goes here</span>
</body>
</html>

HelloWorld.java
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

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

public class HelloWorldApplcation extends WebApplication
{

public HelloWorldApplcation()
{

}
public Class getHomePage()
{
System.out.println("hi");
return HelloWorld.class;
}

/**
* @see org.apache.wicket.Application#getHomePage()
*/

} in same folder in eclipse

My web.xml is

<?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>NewWicket</display-name>

<context-param>
<param-name>configuration</param-name>
<param-value>development</param-value>
</context-param>

<servlet>
<servlet-name>HelloWorldApplication</servlet-name>
<servlet-class>wicket.protocol.http.WicketServlet</servlet-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>
HelloWorldApplication
</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>HelloWorldApplication</servlet-name>
<url-pattern>/helloworld</url-pattern>
</servlet-mapping>

</web-app>
I am trying to run this application on eclipse but its showing error

SEVERE: Servlet /NewWicket threw load() exception
java.lang.ClassNotFoundException: wicket.protocol.http.WicketServlet
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1360)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1083)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4058)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4364)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

please give me any suggestions so that I can move forward

Thanks,
sruthi