spring bootの画面切替について

下記URLよりSpringBootを勉強したてのものです。
大項目の4での住所録の作成はエラーが出て調べて作成ができましたが
課題5を行っている最中でエラーが出てきてしまい、ご教示いただきたいです。
https://www.sys-link.jp/technical/SpringBoot/SpringBoot0-0.html

新規追加のボタンを押すとエラーが出てしまいます。
コントローラは前の住所録と同じ作成方法で行っているので
htmlファイルに問題があるのかと考えておりますが、
どこに問題があるのか自分ではわからない状態です。

BbsController.java
1
2
3import java.util.Date;
4import java.util.List;
5
6import org.springframework.beans.factory.annotation.Autowired;
7import org.springframework.stereotype.Controller;
8import org.springframework.transaction.annotation.Transactional;
9import org.springframework.web.bind.annotation.GetMapping;
10import org.springframework.web.bind.annotation.ModelAttribute;
11import org.springframework.web.bind.annotation.PostMapping;
12import org.springframework.web.bind.annotation.RequestParam;
13import org.springframework.web.servlet.ModelAndView;
14
15@Controller
16public class BbsController {
17	@Autowired
18	BbsRepository repos;
19
20	/* 一覧画面（初期画面）への遷移  */
21	@GetMapping
22	public ModelAndView list() {
23		ModelAndView mav = new ModelAndView();
24		List<Bbs> list = repos.findAll();
25		mav.setViewName("users/list");
26		mav.addObject("data", list);
27		return mav;
28	}
29
30	/* 新規画面への遷移  */
31	@GetMapping("/add")
32	ModelAndView add() {
33		ModelAndView mav = new ModelAndView();
34		Bbs data = new Bbs();
35		mav.addObject("formModel", data);
36		mav.setViewName("users/new");
37		return mav;
38	}
39
40	/* 編集画面への遷移  */
41	@GetMapping("/edit")
42	ModelAndView edit(@RequestParam int id) {
43		ModelAndView mav = new ModelAndView();
44		Bbs data = repos.findById(id);
45		mav.addObject("formModel", data);
46		mav.setViewName("users/new");
47		return mav;
48	}
49	
50	/* 詳細への遷移  */
51	@GetMapping("/show")
52	ModelAndView show(@RequestParam int id) {
53		ModelAndView mav = new ModelAndView();
54		Bbs data = repos.findById(id);
55		mav.addObject("formModel", data);
56		mav.setViewName("users/show");
57		return mav;
58	}
59	
60	/* 更新処理  */
61	@PostMapping()
62	@Transactional(readOnly=false)
63	public ModelAndView save(
64			@ModelAttribute("formModel") Bbs bbs) {
65		bbs.setCreateDate(new Date());
66        repos.saveAndFlush(bbs);
67        return new ModelAndView("redirect:users/list");
68    }
69
70	/* 削除処理  */
71	@PostMapping("/delete")
72	@Transactional(readOnly=false)
73	public ModelAndView delete(@RequestParam int id) {
74		repos.deleteById(id);
75		return new ModelAndView("redirect:/");
76	}
77

BbsRepository.java
1package com.example.demo;
2
3import org.springframework.data.jpa.repository.JpaRepository;
4
5public interface BbsRepository extends JpaRepository<Bbs, Long> {
6	public Bbs findById(int id);
7	public void deleteById(int id);
8}
9

Bbs.java
1package com.example.demo;
2
3import java.util.Date;
4
5import javax.persistence.Column;
6import javax.persistence.Entity;
7import javax.persistence.GeneratedValue;
8import javax.persistence.GenerationType;
9import javax.persistence.Id;
10import javax.persistence.Table;
11
12import lombok.Getter;
13import lombok.Setter;
14
15@Entity
16@Getter
17@Setter
18@Table(name="bbs")
19
20public class Bbs {
21	
22	@Id
23	@GeneratedValue(strategy = GenerationType.AUTO)
24	private int id;
25	
26	@Column
27	private Date createDate;
28	@Column
29	private String title;
30	@Column
31	private String content;
32	@Column
33	private String createUser;
34		
35}

list.html
1<h1>掲示板</h1>
2<table border="1">
3    <tr>
4        <th class="col_create_date">作成日</th>
5        <th class="col_title">タイトル</th>
6        <th class="col_create_user">作成者</th>
7        <th>詳細</th>
8        <th>編集</th>
9        <th>消去</th>
10    </tr>
11    <tr th:each="obj : ${data}">
12        <td th:text="${#dates.format(obj.date, 'yyyy/MM/dd')}">
13        <td th:text="${obj.title}"></td>
14        <td th:text="${obj.create_user}"></td>
15        <td>
16            <form action="/show" method="get">
17                <input type="submit" value="詳細">
18                <input type="hidden" name="id" th:value="${obj.id}">
19            </form>
20        </td>
21        <td>
22            <form action="/edit" method="get">
23                <input type="submit" value="編集">
24                <input type="hidden" name="id" th:value="${obj.id}">
25            </form>
26        </td>
27        <td>
28            <form action="/delete" method="post">
29                <input type="submit" value="削除">
30                <input type="hidden" name="id" th:value="${obj.id}">
31            </form>
32        </td>
33    </tr>
34</table>
35<hr>
36<form action="/add">
37    <input type="submit" value="新規追加" />
38</form>
39</body>
40</html>

new.html
1<!DOCTYPE html>
2<html>
3<head>
4<meta charset="UTF-8">
5<title>Insert title here</title>
6<style>
7table {
8  border-collapse: collapse;
9}
10.col_name {width:200px;}
11.col_data {width:400px;}
12form {display: inline;}
13</style>
14</head>
15<body>
16<h1>掲示板登録</h1>
17<form method="post" action="/" th:object="${formModel}">
18<input type="hidden" name="id" th:value="*{id}">
19<table border="1">
20  <tr>
21      <th class="col_title">タイトル</th>
22      <td class="col_data">
23        <input type="text" name="name" th:value="*{title}" size="40"
24          maxlength= "40" />
25      </td>
26  </tr>
27  <tr>
28      <th>内容</th>
29      <td>
30        <input type="text" name="content" th:value="*{content}" size="40"
31          maxlength="40" />
32      </td>
33  </tr>
34  <tr>
35      <th>作成者</th>
36      <td>
37        <input type="text" name="create_user" th:value="*{create_user}" size="40"
38           maxlength= "40" />
39      </td>
40  </tr>
41</table>
42<hr>
43<input type="submit" value="登　録" />
44</form>
45<form action="/">
46    <input type="submit" value="戻　る" />
47</form>
48</body>
49</html>

m.ts10806

2022/05/11 07:50

どのようなエラーでしょう

Xotic

2022/05/11 08:09

肝心な部分を入力し忘れてしまいました。ページを開くと Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Wed May 11 17:08:38 GMT+09:00 2022 There was an unexpected error (type=Internal Server Error, status=500). An error happened during template parsing (template: "class path resource [templates/users/new.html]") org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/users/new.html]") と表示されています。

m.ts10806

2022/05/11 12:05

質問は編集できます。 500エラーは多岐に渡りますからね。サーバーもしくはコンソールログにそのHTMLのどこに問題があるか行数とか出てるのでは？

Xotic

2022/05/11 13:05

　ありがとうございます。エラー文すべてだと質問に入りきりませんでしたので一応下記に記載しておきます。もう一度見直したら数か所はわかりそうなので再度がんばってみます。」 Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Wed May 11 21:50:51 GMT+09:00 2022 There was an unexpected error (type=Internal Server Error, status=500). An error happened during template parsing (template: "class path resource [templates/users/new.html]") org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/users/new.html]") at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241) at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1401) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1145) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1084) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1743) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.attoparser.ParseException: Exception evaluating SpringEL expression: "create_user" (template: "users/new" - line 37, col 47) at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393) at org.attoparser.MarkupParser.parse(MarkupParser.java:257) at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230) ... 48 more Caused by: org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "create_user" (template: "users/new" - line 37, col 47) at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:292) at org.thymeleaf.standard.expression.SelectionVariableExpression.executeSelectionVariableExpression(SelectionVariableExpression.java:158) at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:92) at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144) at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918) at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleStandaloneElementEnd(TemplateHandlerAdapterMarkupHandler.java:260) at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:256) at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleStandaloneElementEnd(OutputExpressionInlinePreProcessorHandler.java:169) at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleStandaloneElementEnd(InlinedOutputExpressionMarkupHandler.java:104) at org.attoparser.HtmlElement.handleStandaloneElementEnd(HtmlElement.java:79) at org.attoparser.HtmlMarkupHandler.handleStandaloneElementEnd(HtmlMarkupHandler.java:241) at org.attoparser.MarkupEventProcessorHandler.handleStandaloneElementEnd(MarkupEventProcessorHandler.java:327) at org.attoparser.ParsingElementMarkupUtil.parseStandaloneElement(ParsingElementMarkupUtil.java:96) at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:706) at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301) ... 50 more Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'create_user' cannot be found on object of type 'com.example.demo.Bbs' - maybe not public or not valid? at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:91) at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:112) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:338) at org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:265) ... 69 more

m.ts10806

2022/05/11 20:50

エラーは全部必要ではないですけど（トレースなので）これですね。 >org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'create_user' cannot be found on object of type 'com.example.demo.Bbs' - maybe not public or not valid?

行動規範の内容に同意します

回答1件

自己解決

>org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'create_user' cannot be found on object of type 'com.example.demo.Bbs' - maybe not public or not valid?

からcreate_userの文字列がHTMLとjavaで異なったのでこちらを統一したら切り替えが可能になりました。
またほかのエラーが出ましたが、エラー文を読んで頑張ってみたいと思います。

投稿2022/05/13 06:18

Xotic

総合スコア25