[Spring, Thymeleaf] Error - java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'articleDto' available as request attribute

하쮸·2025년 9월 9일
JavaThymeleaf스프링 부트(Spring Boot)에러(Error)

Error, Why, What, How

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1. 현재 상황.

    /*
        글쓰기 뷰 메서드.
    */
    @GetMapping("/create")
    public String createArticle() {
        return "/article_form";
    }

    /*
        글쓰기 저장 메서드.
    */
    @PostMapping("/create")
    public String createArticle(@Valid ArticleDto articleDto, BindingResult bindingResult) {
        // BindingResult : @Valid 에노테이션의 검증 결과를 담고 있는 객체.
        if (bindingResult.hasErrors()) {
            return "/article_form";
        }
        articleService.createArticle(articleDto.getTitle(), articleDto.getContent());
        return "redirect:/article/list";
    }
<!-- layout.html을 상속 받도록 설정. -->
<html layout:decorate="~{layout}">
    <!-- 부모 템플릿(layout.html)의 layout:fragment="content" 부분에 삽입되도록 설정. -->
    <div layout:fragment="content" class="container my-3">
        <h5 class="my-3 border-bottom pb-2">게시판 글쓰기</h5>
        <form th:action="@{/article/create}" method="post" th:object="${articleDto}">
            <div class="alert alert-danger" role="alert" th:if="${#fields.hasAnyErrors()}">
                <div th:each="error : ${#fields.allErrors()}" th:text="${error}"></div>
            </div>
            <div class="mb-3">
                <label for="title" class="form-label">제목</label>
                <input type="text" placeholder="제목을 입력해 주세요." name="title" id="title" class="form-control">
            </div>
            <div class="mb-3">
                <label for="content" class="form-label">내용</label>
                <textarea name="content" placeholder="내용을 입력해 주세요." id="content" class="form-control" rows="10" style="resize: none"></textarea>
            </div>
            <button type="submit" class="btn btn-primary my-2">등록하기</button>
        </form>
    </div>
</html>

2. 에러 메시지.

ERROR 25456 --- [thymeleaf-board] [nio-8080-exec-4] org.thymeleaf.TemplateEngine: [THYMELEAF][http-nio-8080-exec-4] Exception processing template "/article_form": Exception evaluating SpringEL expression: "#fields.hasAnyErrors()" (template: "/article_form" - line 7, col 58)

org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating SpringEL expression: "#fields.hasAnyErrors()" (template: "/article_form" - line 7, col 58)
	at org.thymeleaf.spring6.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:292) ~[thymeleaf-spring6-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.expression.Expression.execute(Expression.java:125) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.processor.StandardIfTagProcessor.isVisible(StandardIfTagProcessor.java:59) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.standard.processor.AbstractStandardConditionalVisibilityTagProcessor.doProcess(AbstractStandardConditionalVisibilityTagProcessor.java:61) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.Model.process(Model.java:282) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1587) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.Model.process(Model.java:282) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1587) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.Model.process(Model.java:282) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.Model.process(Model.java:290) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.GatheringModelProcessable.process(GatheringModelProcessable.java:78) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.CloseElementTag.beHandled(CloseElementTag.java:139) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:661) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1103) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1077) ~[thymeleaf-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.spring6.view.ThymeleafView.renderFragment(ThymeleafView.java:372) ~[thymeleaf-spring6-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.thymeleaf.spring6.view.ThymeleafView.render(ThymeleafView.java:192) ~[thymeleaf-spring6-3.1.2.RELEASE.jar:3.1.2.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1435) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1167) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1105) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:978) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.33.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.2.0.jar:6.2.0]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.33.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.2.0.jar:6.2.0]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.0.jar:6.2.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.2.0.jar:6.2.0]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.0.jar:6.2.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.2.0.jar:6.2.0]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.0.jar:6.2.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:905) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at java.base/java.lang.Thread.run(Thread.java:1589) ~[na:na]
Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'articleDto' available as request attribute

2-1. 문제의 핵심.

  • Thymeleaf가 필요한 데이터 객체를 찾지 못해서 발생한 것.
    특히 #fields.hasAnyErrors()와 th:object="${articleDto}"를 사용하고 있는데 GET 요청 시점에 articleDto 객체가 모델에 추가되지 않아서 발생하는 문제임.
    • th:object 문제
      • 뷰페이지에서 th:object="${articleDto}"를 사용하고 있음.
        하지만 현재 @GetMapping("/create") 메서드는 아무런 객체도 모델에 담아주지 않고 바로 뷰만 반환하고 있기 때문에 Thymeleaf는 articleDto 객체를 찾지 못해서 오류가 발생.

3. 해결.

@GetMapping("/create")
public String createArticle(Model model) {
    model.addAttribute("articleDto", new ArticleDto());
    return "article_form";
}
  • 모델 객체에 addAttribute를 이용해서 'articleDto'이름으로 ArticleDto객체를 저장하면 됨.

  • 매개변수에 Model을 사용하지 않고
@GetMapping("/create")	
public String createArticle(ArticleDto articleDto) {
	return "question_form";
}
  • 이렇게 해도 해결이 됨.
    • Spring MVC가 메서드 파라미터에 있는 객체를 자동으로 Model에 추가해줌.

4. 참고.

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[Spring] How - validation을 이용해서 BindingResult 활용하기.

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