Ciao gente sto imparando i bean! Non mi funziona sto codice:

bean:
codice:
public class Person {

	private String name;
	private String surname;
	private int age;

	public void setName(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setSurname(String surname) {
		this.surname = surname;
	}

	public String getSurname() {
		return surname;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public int getAge() {
		return age;
	}
}
e pagine jsp:
presentation.jsp
codice:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!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>Insert title here</title>
</head>
<body>

<form action="welcome.jsp"><input type="text" name="name">


<input type="text" name="surname"> <input type="text" name="age">
<input type="submit" value="Submit"></form>


</body>
</html>
e welcome.jsp
codice:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<jsp:useBean id="person" scope="session" class="Person" />
<jsp:setProperty name="person" property="name" param="name" />
<jsp:setProperty name="person" property="surname" param="surname" />
<jsp:setProperty name="person" property="age" param="age" />

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>


Benvenuto
<jsp:getProperty name="person" property="name"/>
<jsp:getProperty name="person" property="surname"/>

hai
<jsp:getProperty name="person" property="age"/>
anni!
</body>
</html>
Mi dice che l'oggetto "person" non è riconosciuto! Che devo fare?