NoClassDefFoundError: Tomcat problem?

[Ghodmode]

I'm having a problem deploying a Wicket application, so I create a basic
HelloWicket app and I'm still getting the problem:

java.lang.NoClassDefFoundError:
org/apache/wicket/protocol/http/WebApplication

Apache Tomcat 6.0.14
Java 1.6.0_02-b05
Wicket 1.3.0-beta3

I think that this is a Tomcat problem.  Maybe I'm misunderstanding something
basic about application deployment on Tomcat.  This is currently only
affecting my Wicket app, but that's the only thing on there other than
HelloWorld servlets.

What am I doing wrong?

The Wicket JAR file and two of its dependencies are in WEB-INF/lib:
@home:~/dev/tomcat/webapps/HelloWicket/WEB-INF/classes$ ls -ltr ../lib
total 1648
-rw-r--r-- 1 vince vince 1657246 2007-09-04 10:00 wicket-1.3.0-beta3.jar
-rw-r--r-- 1 vince vince    7449 2007-09-04 10:00 slf4j-simple-1.4.3.jar
-rw-r--r-- 1 vince vince   15345 2007-09-04 10:00 slf4j-api-1.4.3.jar


Here's my web.xml:[EMAIL PROTECTED]:~/dev/tomcat/webapps/HelloWicket/WEB-INF$ 
cat
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC
   "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
   "http://java.sun.com/dtd/web-app_2_3.dtd";>
<web-app>
        <context-param>
                <param-name>configuration</param-name>
                <param-value>development</param-value>
        </context-param>

        <servlet>
                <servlet-name>HelloWicket</servlet-name>
                <servlet-class>org.apache.wicket.protocol.http.WicketServlet
</servlet-class>
                <init-param>
                        <param-name>applicationClassName</param-name>
                        <param-value>mypackage.HelloWicketApp</param-value>
                </init-param>
                <load-on-startup>1</load-on-startup>
        </servlet>

        <servlet-mapping>
                <servlet-name>HelloWicket</servlet-name>
                <url-pattern>/helloWicket/*</url-pattern>
        </servlet-mapping>
</web-app>[/code]

Here's the layout of my servlet's
directory:[EMAIL PROTECTED]:~/dev/tomcat/webapps/HelloWicket$ ls -ltrR
.:
total 8
-rw-r--r-- 1 vince vince   44 2007-09-04 10:00 index.html
drwxr-xr-x 4 vince vince 4096 2007-09-04 10:27 WEB-INF

./WEB-INF:
total 12
drwxr-xr-x 2 vince vince 4096 2007-09-04 10:00 lib
drwxr-xr-x 3 vince vince 4096 2007-09-04 10:05 classes
-rwxr-xr-x 1 vince vince  755 2007-09-04 10:08 web.xml

./WEB-INF/lib:
total 1648
-rw-r--r-- 1 vince vince 1657246 2007-09-04 10:00 wicket-1.3.0-beta3.jar
-rw-r--r-- 1 vince vince    7449 2007-09-04 10:00 slf4j-simple-1.4.3.jar
-rw-r--r-- 1 vince vince   15345 2007-09-04 10:00 slf4j-api-1.4.3.jar

./WEB-INF/classes:
total 8
-rw-r--r-- 1 vince vince  601 2007-09-04 10:04 HelloWicket.html
drwxr-xr-x 2 vince vince 4096 2007-09-04 10:20 mypackage

./WEB-INF/classes/mypackage:
total 16
-rw-r--r-- 1 vince vince 238 2007-09-04 10:06 HelloWicket.java
-rw-r--r-- 1 vince vince 192 2007-09-04 10:20 HelloWicketApp.java
-rw-r--r-- 1 vince vince 468 2007-09-04 10:20 HelloWicket.class
-rw-r--r-- 1 vince vince 347 2007-09-04 10:20 HelloWicketApp.class[/code]

Thank you,
    Vince