Duvida com o REST (Representational State Transfer)

Front-end
#1

Pessoal,
to apanhando aqui do Rest…

eu tenho que implementar um serviço que dado um CPF deve-se retornar uma lista de clientes…

pois bem, comecei a tentar instalar o jersey. Uso o Maven e o Jetty …
daí coloquei as dependencias no pom.xml da seguinte maneira:
Core Server

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-server</artifactId>
    <version>1.0</version>
</dependency>

Core Client

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.0</version>
</dependency>

Core Spring

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-spring</artifactId>
    <version>1.0</version>
</dependency>

beleza… o maven instalou esses jars pra mim…

meu 2° passo foi criar uma classe bem simples:

package com.sun.ws.rest.samples.helloworld.resources;

import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.Path;

// The Java class will be hosted at the URI path "/helloworld"
@Path("/helloworld")
public class HelloWorldResource {

    // The Java method will process HTTP GET requests
    @GET
    // The Java method will produce content identified by the MIME Media
    // type "text/plain"
    @Produces("text/plain")
    public String getClichedMessage() {
        // Return some cliched textual content
        return "Hello World";
    }
}

A grande verdade sobre minha duvida é no web.xml
to usando o jetty e coloquei um servelet da sequinte maneira:

<servlet>
        <servlet-name>Jersey Web Application</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>org.foo.rest;org.bar.rest</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
		<servlet-name>Jersey Web Application</servlet-name>
		<url-pattern>/service/*</url-pattern>
	</servlet-mapping>

inicio a app e coloco no browser:
http://localhost:8080/hb/service/helloworld

mas o que eu recebo é um erro :

HTTP ERROR: 500

The ResourceConfig instance does not contain any root resource classes.

RequestURI=/hb/service/helloworld
Caused by:

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
	at com.sun.jersey.impl.application.WebApplicationImpl.processRootResources(WebApplicationImpl.java:774)
	at com.sun.jersey.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:671)
	at com.sun.jersey.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:487)
	at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:622)
	at com.sun.jersey.spi.container.servlet.ServletContainer.load(ServletContainer.java:538)
	at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:197)
	at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:433)
	at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:342)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:722)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:404)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

Alguem pode me ajudar : :shock:
obrigado!!!

#2