Erro com Struts [RESOLVIDO]

<h1>Minha primeira página usando Struts !</h1>

public class TesteSimplesAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		System.out.println("Executando o código da lógica de negócios ...");
		return mapping.findForward("ok");
	}
}

<servlet>
		<servlet-name>testeDeStruts</servlet-name>
		<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>testeDeStruts</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>

<struts-config>
		<action-mappings>
			<action path="/teste" type="struts.action.TesteSimplesAction">
				<forward name="ok" path="/exemplo.jsp"/>
			</action>
		</action-mappings>
		<message-resources parameter="resources.application"/>
	</struts-config>

HTTP Status 404 - Servlet testeDeStruts is not available
type Status report
message Servlet testeDeStruts is not available
description The requested resource (Servlet testeDeStruts is not available) is not available.
Apache Tomcat/6.0.20

<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>