Java – jetty package org.json.simple does not exist

I have simple servlet to be used by jetty.

This is fragment of my servlet:

import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

public class Oscar4Servlet extends HttpServlet
{ 
...

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException
    {
        request.setCharacterEncoding("utf8");
        response.setCharacterEncoding("utf8");
        response.setContentType("application/json");
        PrintWriter out = resp.getWriter();

        JSONObject obj = new JSONObject();
        obj.put("message", "hello from server");
        out.print(obj);
    }
}

After invoking:

javac -cp  /usr/share/jetty/lib/servlet-api-2.5.jar  Oscar4Servlet.java 

I'm getting this error:

Oscar4Servlet.java:5: error: package org.json.simple does not exist
import org.json.simple.JSONObject;
                      ^
Oscar4Servlet.java:6: error: package org.json.simple does not exist
import org.json.simple.JSONValue;

Although I have json-simple-1.1.1.jar (downloaded from http://code.google.com/p/json-simple/downloads/detail?name=json-simple-1.1.1.jar) in my WEB_INF/lib directory… Any ideas why?