SpringBoot フォームで複数レコードの値を受け取れない

前提・実現したいこと

いつもお世話になっております。
Spring Bootで1つのフォームから複数のレコードを更新したいのですが、コントローラーで値が受け取れません。
コントローラーで値を受け取り、複数レコードを更新したいです。
イメージは送信ボタンが押されると複数のレコードが同時に更新される感じです。

発生している問題・エラーメッセージ

エラーメッセージ
There was an unexpected error (type=Internal Server Error, status=500).
No message available
java.lang.NullPointerException

該当のソースコード

文字数制限の関係でsetter,getter省略しています

エンティティクラス

java
1package jp.co.itc.mbo.entity;
2
3import java.sql.Timestamp;
4import java.util.List;
5
6import javax.persistence.Column;
7import javax.persistence.Entity;
8import javax.persistence.GeneratedValue;
9import javax.persistence.GenerationType;
10import javax.persistence.Id;
11import javax.persistence.JoinColumn;
12import javax.persistence.ManyToOne;
13import javax.persistence.OneToMany;
14import javax.persistence.Table;
15
16@Entity
17@Table(name="goals_seq")
18public class GoalSeq {
19@Entity
20@Table(name="goals_seq")
21public class GoalSeq {
22	 @Id
23	 @Column(name="id")
24	    @GeneratedValue(strategy = GenerationType.IDENTITY)
25	    private Integer id;
26
27	 @ManyToOne(targetEntity = UserMaster.class)
28		@JoinColumn(nullable = false, name = "user_id")
29		private UserMaster userid;
30
31	    @Column(name="goal_id")
32	    private Integer goalid;
33
34	    @Column(name="goal_title")
35	    private String goaltitle;
36
37	    @Column(name="goal_detail")
38	    private String goaldetail;
39
40	    @Column(name="year")
41		private Integer year;
42
43	    @Column(name = "updated_at")
44	    private Timestamp updatedat;
45
46	    @Column(name = "updated_by")
47		private Integer updatedby;
48
49		@Column(name = "delete_flg")
50		private Boolean deleteflg;
51
52		@Column(name = "created_at")
53		private Timestamp createdat;
54
55		@OneToMany(mappedBy = "goalseqid")
56		private List<Meisai> meisaiList;
57
58

java
1package jp.co.itc.mbo.entity;
2
3import java.sql.Timestamp;
4
5import javax.persistence.Column;
6import javax.persistence.Entity;
7import javax.persistence.GeneratedValue;
8import javax.persistence.GenerationType;
9import javax.persistence.Id;
10import javax.persistence.JoinColumn;
11import javax.persistence.ManyToOne;
12import javax.persistence.Table;
13
14@Entity
15@Table(name = "meisai_tbl")
16public class Meisai {
17
18  @Entity
19@Table(name = "meisai_tbl")
20public class Meisai {
21
22    @Id
23    @Column(name = "meisai_id")
24    @GeneratedValue(strategy = GenerationType.IDENTITY)
25    private Integer meisaiid;
26
27    @Column(name = "timing")
28    private Integer timing;
29
30    @Column(name = "target")
31    private Boolean target;
32
33    @Column(name="goal_weight")
34    private Integer goalWeight;
35
36    @Column(name="evalution")
37    private Integer evalution;
38
39    @Column(name="self_comment")
40    private String selfComment;
41
42    @Column(name="boss_comment")
43    private String bossComment;
44
45    @Column(name="review_check")
46    private Integer reviewCheck;
47
48    @Column(name="status")
49    private Integer status;
50
51    @Column(name="score")
52    private Double score;
53
54    @Column(name = "updated_at")
55    private Timestamp updatedat;
56
57    @Column(name = "updated_by")
58	private Integer updatedby;
59
60	@Column(name = "delete_flg")
61	private Boolean deleteflg;
62
63	@Column(name = "created_at")
64	private Timestamp createdat;
65

フォームクラス

java
1package jp.co.itc.mbo.form;
2
3import java.util.List;
4
5import javax.persistence.OneToMany;
6
7import jp.co.itc.mbo.entity.Meisai;
8
9public class GoalSeqForm {
10
11	private String goaltitle;
12	private Integer year;
13	private String goaldetail;
14
15	@OneToMany(mappedBy = "goalseqid")
16	private List<Meisai> meisaiList;
17}
18

java
1package jp.co.itc.mbo.form;
2
3import javax.persistence.JoinColumn;
4import javax.persistence.ManyToOne;
5
6import jp.co.itc.mbo.entity.GoalSeq;
7
8public class MeisaiForm {
9
10	private Boolean target;
11	private Integer goalWeight;
12	private Integer evalution;
13	private String selfComment;
14	private String bossComment;
15	private Integer reviewCheck;
16	private Integer status;
17	private Double score;
18
19	@ManyToOne(targetEntity = GoalSeq.class)
20	 @JoinColumn( name = "goalseq_id")
21	 private GoalSeq goalseqid;
22

コントローラー

java
1	@RequestMapping(value = "{id}/weight_input")
2	String weightInput(@PathVariable Integer id,Model model) {
3		List<GoalSeq> goalseqs = goalseqservice.findCurrent(id);
4		model.addAttribute("goalseqs", goalseqs);
5		return "goals/weight_input";}
6
7	@RequestMapping(value = "/weight_complete/{id}", method = RequestMethod.POST)
8	String weightRegist(@PathVariable Integer id,@Valid GoalSeqForm goalseqform, Principal principal,BindingResult bindingResult) {
9		if (bindingResult.hasErrors()) {}
10		List <GoalSeq> goalseqs=goalseqservice.findCurrent(id);
11		for(GoalSeq goalseq: goalseqs) {
12			for (int i = 0; i <= 2; i++) {
13//↓ここでヌルポが出ます	
14		goalseq.getMeisaiList().get(i).setGoalWeight(goalseqform.getMeisaiList().get(i).getGoalWeight());
15			goalseqservice.save(goalseq);
16		}
17		}
18		return  "redirect:/{id}";
19	}

HTML

HTML
1<!DOCTYPE html>
2<html xmlns:th="http://www.thymeleaf.org"
3	xmlns:sec="http://www.thymeleaf.org/extras/spring-security">
4<head th:replace="layout :: layout('HOME',~{::link})">
5<meta charset="UTF-8">
6<title>Insert title here</title>
7</head>
8<body>
9
10	<form  method="post" th:action="@{/weight_complete/}+${goalseqs[0].userid.id}">
11	<table>
12	<tr>
13	<th>目標番号</th>
14	<th>期中ウエイト</th>
15	<th>期末ウエイト</th>
16	<th></th>
17	</tr>
18	<tr  th:each="goalseq: ${goalseqs}" th:object="${goalseq}">
19	<td><input type="text" id="goalid"
20			name="goalid" th:value="*{goalid}"></td>
21	<td><input type=number id="goalWeight" name="goalWeight" th:value="*{meisaiList[1].goalWeight}"></td>
22		<td><input type=number  id="goalWeight" name="goalWeight" th:value="*{meisaiList[2].goalWeight}" ></td>
23	</tr>
24	</table>
25<input type=submit value="送信">
26	</form>
27	<div th:replace="layout :: footer"></div>
28</body>
29</html>

試したこと

・HTMLのth:valueをth:fieldに変更→Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'goalseq' available as request attribute
というエラーが出て断念しました