Erro na compilacao: nao encontra a classe

Tenho um erro aqui e nao encontro a solucao:

C:\WebProjects\MyProjects\beerV1>javac -classpath \tomcat\common\lib\servlet-api
.jar -d classes src\com\example\web\BeerSelect.java

src\com\example\web\BeerSelect.java:3: package com.example.model does not exist

import com.example.model.*;

^

src\com\example\web\BeerSelect.java:20: cannot find symbol

symbol  : class BeerExpert

location: class com.example.web.BeerSelect

BeerExpert be = new BeerExpert();

^

src\com\example\web\BeerSelect.java:20: cannot find symbol

symbol  : class BeerExpert

location: class com.example.web.BeerSelect

BeerExpert be = new BeerExpert();

^

3 errors

O codigo do servlet e:

package com.example.web;

import com.example.model.<em>;

import javax.servlet.</em>;

import javax.servlet.http.<em>;

import <a href="http://java.io">java.io</a>.</em>;

import java.util.*;

public class BeerSelect extends HttpServlet{

public void doPost(HttpServletRequest request,
		HttpServletResponse response)
		throws IOException, ServletException{

	response.setContentType("text/html");
	PrintWriter out = response.getWriter();
	out.println("Beer Selection Advice<br>");
	String c = request.getParameter("color");

	BeerExpert be = new BeerExpert();
	List result = be.getBrands(c);
	Iterator it = result.iterator();
	while(it.hasNext()){
	   out.print("<br>try: " + it.next());
      }

tambem foi criado o codigo da classe ‘model’ que e:

package com.example.model;

import java.util.*;

public class BeerExpert{
public List getBrands(String color){

List <String>brands = new ArrayList<String>();
if (color.equals("amber")) {
   brands.add("Jack Amber");
   brands.add("Red Moose");
}
else {
   brands.add("Jail Pale Ale");
   brands.add("Gout Stout");
}
return(brands);
}

}
e tambem o arquivo .xml. quando compilo aparece este erro,pois nao encontra a package com.example.model que eu ja criei.
O meu ambiente de desenvolvimento e:

c:\webprojects\myprojects\beerV1\etc\web.xml
c:\webprojects\myprojects\beerV1\lib
c:\webprojects\myprojects\beerV1\src\com\example\web\Beerselect.java
c:\webprojects\myprojects\beerV1\src\com\example\model\BeerExpert.java
c:\webprojects\myprojects\beerV1\classes\com\example\web\Beerselect.class–> nao gera esta classe neste diretorio
c:\webprojects\myprojects\beerV1\classes\com\example\model\BeerExpert.class–> nao gera esta classe neste diretorio

alguma sugestao por favor?

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