Erro ao executar

Pessoal olha pra mim o código, depois de compilado que eu clico em Submit na pagina html da um erro

HTTP Status 404 - /CadastroEmail/cadastra.do -------------------------------------------------------------------------------- type Status report message /CadastroEmail/cadastra.do description The requested resource (/CadastroEmail/cadastra.do) is not available. -------------------------------------------------------------------------------- Apache Tomcat/6.0.32

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Cadastro de Email</title>
</head>
<body>
<h1>Bem Vindos</h1>
<form method="POST" action="cadastra.do">
<p>Seu nome <input type="text" name="nome" size="40"></p>
<p>Seu email <input type="text" name="email" size="40"></p>
<p><input type="submit" value="Submit"><input type="reset" value="Reset"></p>
</form>
</body>
</html>

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

public class CadastroServlet extends HttpServlet {
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//pega parâmetro do request
		String nome = request.getParameter("nome");
		String email = request.getParameter("email");
		
		GregorianCalendar calendario = new GregorianCalendar();
		String mensagem = calendario.get(Calendar.AM_PM) == Calendar.AM?
				"Bom dia" : "Boa Tarde";
		//acerta tipo MIME para resposta
		response.setContentType("text/html");
		
		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<body>");
		out.println("<p>" + mensagem + "," + nome + "</p>");
		out.println("<p>Obrigado por cadastrar seu email (" + email + ") conosco. <p>");
		out.println("</body>");
		out.println("</html>");
	}

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <servlet>
    <servlet-name>Cad Email</servlet-name>
    <servlet-class>CadastroServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Cad Email</servlet-name>
    <url-pattern>/cadastra.do</url-pattern>
  </servlet-mapping>
</web-app>

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