formタグのラジオボタンのプロパティの値をうまく取得できない

Springのformタグを用いて複数のラジオボタンの値を取得がうまくいかないです。

ユーザ情報を格納するモデルクラス(User.java)

java
1import java.io.Serializable;
2
3@SuppressWarnings("serial")
4public class User implements Serializable {
5
6	private String name;
7
8	private Integer age;
9	
10	private Integer authority;
11
12	public Integer getAuthority() {
13		return authority;
14	}
15
16	public void setAuthority(Integer authority) {
17		this.authority = authority;
18	}
19
20	public User() {
21		super();
22	}
23
24	public User(String _userId, Integer _age,Integer _authority) {
25		this.name = _userId;
26		this.age = _age;
27		this.authority = _authority;
28	}
29
30	public String getName() {
31		return name;
32	}
33
34	public void setName(String name) {
35		this.name = name;
36	}
37
38	public Integer getAge() {
39		return age;
40	}
41
42	public void setAge(Integer age) {
43		this.age = age;
44	}
45}

コントローラクラス

java
1import java.util.ArrayList;
2import java.util.HashMap;
3import java.util.List;
4import java.util.Map;
5
6import org.springframework.stereotype.Controller;
7import org.springframework.ui.Model;
8import org.springframework.web.bind.annotation.RequestMapping;
9import org.springframework.web.bind.annotation.RequestMethod;
10
11import com.minutes.test.model.User;
12
13@Controller
14public class HomeController {
15
16	@RequestMapping(value = "/input", method = RequestMethod.GET)
17	public String getHome(Model model) {
18		
19		List<User> userList = new ArrayList<User>();
20		
21		/*
22		 * ユーザ情報
23		 * */
24		userList.add(new User("name00",23,1));
25		userList.add(new User("name01",44,1));
26		userList.add(new User("name02",23,3));
27		userList.add(new User("name03",43,2));
28		userList.add(new User("name04",22,3));
29		userList.add(new User("name05",21,1));
30		
31		Map<String, Object> map = new HashMap<>();
32		
33		map.put("userList", userList);
34		map.put("usr", new User());
35		
36		model.addAllAttributes(map);
37		return "input";
38	}
39	
40	@RequestMapping(value = "/input", method = RequestMethod.POST)
41	public String postHome() {
42		System.out.println("登録処理");
43		return "input";
44	}
45}

input.jsp

jsp
1<%@ page contentType="text/html; charset=UTF-8"%>
2<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
3<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
4<%@ page session="false"%>
5<c:set var="contextPath" value="${pageContext.request.contextPath}" />
6<html>
7<head>
8<title>input</title>
9<meta charset="utf-8">
10</head>
11<body>
12	<div align="center">
13		<h2>権限設定</h2>
14		<form method="POST" action="${contextPath}/input">
15			<table border="1">
16				<tr>
17					<th>ユーザ名</th>
18					<th>なし</th>
19					<th>回覧</th>
20					<th>承認</th>
21				</tr>
22				<c:forEach var="user" items="${userList}">
23					<tr>
24						<td>${user.name}</td>
25						<!-- 権限情報追加 -->
26						<td><form:radiobutton path="usr.authority" value="1"/>
27						<td><form:radiobutton path="usr.authority" value="2"/>
28						<td><form:radiobutton path="usr.authority" value="3"/>
29						</td>
30					</tr>
31				</c:forEach>
32			</table>
33			<input type="submit" />
34		</form>
35	</div>
36</body>
37</html>
38