thymeleaf fields.hasErrorsがエラーになりHTMLが表示されない(500error)

環境：
Spring Tool Suite 4 4.7.2
Tomcat/9.0.30
JavaSE-11
MySQL

DBからリストを取得し、Create,Edit,Detail,Delete,List画面でそれぞれ処理する基本的なものをSpringBootで作成しています。
やりたい事

Create.html(新規登録画面)とEdit.html(編集画面)にバリデーションチェックを実装

現状

Create.htmlには問題なく実装できたが、Edit.htmlに遷移しようとするとエラーになる。
エラーメッセージ(文字数制限のため一部抜粋)

Error
1
2org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasErrors('name')" (template: "Edit" - line 17, col 9)
3	at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:290) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE]
4	at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
5	at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
6

どうやらEdit.htmlの#fields.hasErrors('name')の部分でエラーになっているらしいのですが、Create.htmlでは問題なく動作するので原因がわかりません。

Create.html

java
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org">
3<head>
4<meta charset="UTF-8">
5<title>Insert title here</title>
6<script type="text/javascript" th:src="@{/jquery-3.5.1.min.js}"></script>
7</head>
8<body>
9
10<h2>新規登録</h2>
11
12<form action="EntityList" th:object="${entity}" method="post">
13
14	<label>生年月日</label>
15		<span th:if="${#fields.hasErrors('year')}" th:errors="*{year}" style="color: red"></span>
16		<br>
17		<input type="text" id="year" name="year" th:attr="onkeyup='CalcAge();'" th:field="*{year}" value=null>年
18		<span th:if="${#fields.hasErrors('month')}" th:errors="*{month}" style="color: red"></span>
19		<br>
20		<input type="text" id="month" name="month" th:attr="onkeyup='CalcAge();'" th:field="*{month}">月 
21		<span th:if="${#fields.hasErrors('day')}" th:errors="*{day}" style="color: red"></span>
22		<br> 
23		<input type="text" id="day" name="day" th:attr="onkeyup='CalcAge();'" th:field="*{day}">日 
24		<input type="text" id="age" name="age" readonly>歳
25		<br>
26	<label>氏名</label>
27		<span th:if="${#fields.hasErrors('name')}" th:errors="*{name}" style="color: red"></span><br /> 
28		<input type="text" id="name" name="name" th:field="*{name}">
29		<br>
30	<label>かな</label>
31		<span th:if="${#fields.hasErrors('kana')}" th:errors="*{kana}" style="color: red"></span><br />
32		<input type="text" id="kana" name="kana" th:field="*{kana}">
33		<br>
34	<label>郵便番号</label>
35		<span th:if="${#fields.hasErrors('code')}" th:errors="*{code}" style="color: red"></span><br />
36		〒<input type="text" id="code" name="code" th:field="*{code}">
37		<br>
38	<label>住所</label>
39		<span th:if="${#fields.hasErrors('add1')}" th:errors="*{add1}" style="color: red"></span><br />
40		<input type="text" id="add1" name="add1" th:field="*{add1}">
41		<br>
42	<label>番地以降</label>
43		<span th:if="${#fields.hasErrors('add2')}" th:errors="*{add2}" style="color: red"></span><br />
44		<input type="text" id="add2" name="add2" th:field="*{add2}">
45		<br>
46	<label>メールアドレス</label>
47		<span th:if="${#fields.hasErrors('mail')}" th:errors="*{mail}" style="color: red"></span><br /> 
48		<input type="text" id="mail" name="mail" th:field="*{mail}">
49		<br>
50	<label>電話番号</label>
51		<span th:if="${#fields.hasErrors('tell')}" th:errors="*{tell}" style="color: red"></span><br /> 
52		<input type="text" id="tell" name="tell" th:field="*{tell}">
53		<br>
54	<p>
55		<input type="submit" value="登録" name="insert">
56	</p>
57</form>
58<a href="/EntityList">リストに戻る</a>
59</body>
60</html>

Edit.html

java
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org">
3<head>
4<meta charset="UTF-8">
5<title>Insert title here</title>
6<script type="text/javascript" th:src="@{/jquery-3.5.1.min.js}"></script>
7</head>
8<body>
9<h2>編集</h2>
10<form action="EntityList" th:object="${entity}" method="post">
11	<span th:each="list:${list}">
12	<label>従業員No.</label>
13		<input type="text" id="nom" name="nom"th:value="${list.nom}" readonly>	
14	<label>氏名</label>
15		<span th:if="${#fields.hasErrors('name')}" th:errors="*{name}" style="color: red"></span><br /> 
16		<br>
17		<input type="text" id="name" name="name" th:value="${list.name}" th:field="*{name}">
18		<br>
19	<label>かな</label>
20		<span th:if="${#fields.hasErrors('kana')}" th:errors="*{kana}" style="color: red"></span><br />
21		<br>
22		<input type="text" id="kana" name="kana"th:value="${list.kana}" th:field="*{kana}">
23		<br>
24	<label>生年月日</label>
25		<span th:if="${#fields.hasErrors('year')}" th:errors="*{year}" style="color: red" th:field="*{year}"></span>
26		<br>
27		<input type="text" id="year" name="year" th:attr="onkeyup='CalcAge2();'" th:value="${list.year}">年
28		<span th:if="${#fields.hasErrors('month')}" th:errors="*{month}" style="color: red"></span>
29		<br>
30		<input type="text" id="month" name="month" th:attr="onkeyup='CalcAge2();'"th:value="${list.month}" th:field="*{month}">月
31		<span th:if="${#fields.hasErrors('day')}" th:errors="*{day}" style="color: red"></span>
32		<br> 
33		<input type="text" id="day" name="day" th:attr="onkeyup='CalcAge2();'"th:value="${list.day}" th:field="*{day}">日
34		<br>
35		<input type="text" id="age" name="age"th:value="${list.age}" readonly>歳
36		<br>
37	<label>メールアドレス</label>
38		<span th:if="${#fields.hasErrors('mail')}" th:errors="*{mail}" style="color: red"></span>
39		<br> 
40		<input type="text" id="mail" name="mail"th:value="${list.mail}" th:field="*{mail}">
41		<br>
42	<label>電話番号</label>
43		<span th:if="${#fields.hasErrors('tell')}" th:errors="*{tell}" style="color: red"></span>
44		<br> 
45		<input type="text" id="tell" name="tell"th:value="${list.tell}" th:field="*{tell}">
46		<br>
47	<label>郵便番号</label>
48		<span th:if="${#fields.hasErrors('code')}" th:errors="*{code}" style="color: red"></span>
49		<br>
50		<input type="text" id="code" name="code"th:value="${list.code}" th:field="*{code}">
51		<br>
52	<label>住所</label>
53		<span th:if="${#fields.hasErrors('add1')}" th:errors="*{add1}" style="color: red"></span>
54		<br>
55		<input type="text" id="add1" name="add1" th:value="${list.add1}" th:field="*{add1}">
56		<br>
57	<label>番地以降</label>
58		<span th:if="${#fields.hasErrors('add2')}" th:errors="*{add2}" style="color: red"></span>
59		<br>
60		<input type="text" id="add2" name="add2"th:value="${list.add2}" th:field="*{add2}">
61		<br>
62	<p>
63		<input type="submit" name="update" value="修正・変更" />
64	</p>
65	</span>
66</form>
67
68<a href="/EntityList">リストに戻る</a>
69
70</body>
71</html>

MastaController.java

java
1package mastalist;
2
3import java.util.ArrayList;
4import java.util.List
5import org.springframework.beans.factory.annotation.Autowired;
6import org.springframework.stereotype.Controller;
7import org.springframework.ui.Model;
8import org.springframework.validation.BindingResult;
9import org.springframework.validation.annotation.Validated;
10import org.springframework.web.bind.annotation.GetMapping;
11import org.springframework.web.bind.annotation.ModelAttribute;
12import org.springframework.web.bind.annotation.RequestMapping;
13import org.springframework.web.bind.annotation.RequestMethod;
14import org.springframework.web.bind.annotation.RequestParam;
15
16@RequestMapping("/EntityList")
17@Controller
18public class MastaController {
19	@Autowired
20	private SelectAll selectAll;
21	@GetMapping
22	public String SelectList(Model model){
23		ArrayList<Entity> list = selectAll.selectall();
24		model.addAttribute("AllList",list);
25		return "EntityList";
26	}
27	@RequestMapping(params="create")
28	public String Create(@ModelAttribute Entity entity) {
29		return "Create";
30	}
31	@Autowired
32	InsertForm insertForm;
33	
34	@RequestMapping(params="insert", method=RequestMethod.POST)
35	public String Insert(@Validated Entity entity,BindingResult result,Model model) {
36		if ( result.hasErrors() ) {
37			return "Create";
38		} else {
39			String message = insertForm.insert(entity);
40			model.addAttribute("message",message);
41		}
42		return "EntityList";
43	}
44	
45	@Autowired
46	SelectNum selectNum;
47	
48	@RequestMapping(params="edit")
49	public String Edit(@RequestParam("nom")int nom,Model model) {
50		List<Entity> list = selectNum.selectnum(nom);
51		model.addAttribute("list",list);
52		return "Edit";
53	}
54	
55	@Autowired
56	UpdateForm updateForm;
57	
58	@RequestMapping(params="update",method=RequestMethod.POST)
59	public String Update(@Validated Entity entity,BindingResult result,Model model) {
60		if ( result.hasErrors() ) {
61			return "Edit";
62		} else {
63		String message = updateForm.update(entity);
64		model.addAttribute("message", message);
65		}
66		return "EntityList";
67	}
68	
69}
70

Entity.java

java
1package mastalist;
2
3import javax.validation.constraints.NotBlank;
4import javax.validation.constraints.NotNull;
5
6import lombok.Getter;
7import lombok.Setter;
8
9@Getter
10@Setter
11public class Entity {
12	Integer nom;
13    @NotBlank(message = "名前を入力してください")
14    String name;
15    @NotBlank(message = "かなを入力してください")
16    String kana;
17    @NotBlank(message = "電話番号を入力してください")
18	private String tell;
19	@NotBlank(message = "メールアドレスを入力してください")
20	private String mail;
21	@NotNull(message = "生年月日を入力してください")
22	private Integer year;
23	@NotNull(message = "")
24	private Integer month;
25	@NotNull(message = "")
26	private Integer day;
27	@NotNull(message = "")
28	private Integer age;
29	@NotNull(message = "")
30	private Integer code;
31	@NotBlank(message = "")
32	private String add1;
33	@NotBlank(message = "")
34	private String add2;
35}
36