Spring with Thymeleaf、BindingResult 或 bean 名称“user"的普通目标对象可用作请求属性 [英] Spring with Thymeleaf, BindingResult nor plain target object for bean name 'user' available as request attribute

问题描述

我使用 Thymeleaf 和 Spring 创建了一个表单并遇到了这个问题.我还阅读了这个问题，但是它对我不起作用

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0";xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation=http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><父母><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.3</version><relativePath/><!-- 从存储库中查找父级 --></父母><groupId>mz.painting</groupId><artifactId>mz</artifactId><version>0.0.1-SNAPSHOT</version><name>M&amp;Z 绘画</name><description>M&amp;Z 的 Web 应用程序 </description><属性><java.version>11</java.version></属性><依赖项><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></依赖><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></依赖><依赖><groupId>org.thymeleaf</groupId><artifactId>百里香</artifactId></依赖><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></依赖><依赖><groupId>org.thymeleaf</groupId><artifactId>thymeleaf-spring5</artifactId></依赖><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></依赖><依赖><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>运行时</scope></依赖><依赖><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><范围>测试</范围></依赖><依赖><groupId>javax.validation</groupId><artifactId>validation-api</artifactId></依赖><依赖><groupId>org.hibernate.validator</groupId><artifactId>hibernate-validator</artifactId></依赖></依赖项><构建><插件><插件><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></插件></plugins></build></项目>

控制器更新

@Controller公共类SavingUser{@自动连线私有 UserRepository userRepository;@GetMapping("/addUser")公共字符串添加用户(模型模型){System.out.println("在注册页面添加用户..");model.addAttribute(user", new Customer());返回服务"；}@PostMapping("/registerUser")公共字符串用户注册(@ModelAttribute 客户用户，模型模型){System.out.println("用户在注册页面..");model.addAttribute(用户", 用户);//userRepository.save(user);返回重定向:/服务"；}

**Bean 类**吸气剂()二传手()toString()

HTML 表单

 
<form action="registerUser";th:action="@{/registerUser}";th:object="${user}";方法=POST"><br/><label>您的姓名:</label><br/><输入类型=文本"th:field="*{name}";占位符="/><br><label >你的郊区</label><br/><输入类型=文本"th:field="*{suburb}";占位符="/><br/><label>电子邮件</label><br/><输入类型=电子邮件"th:field="*{email}";占位符="/><br/><label>电话</label><br/><输入类型=电话"th:field="*{电话}";占位符="/><br/><label>请告诉我们我们可以如何提供帮助</label><br/><textarea type="text";th:field="*{text}";行=10"cols=40"></textarea><br/><div><输入类=提交";类型=提交"值=提交"/><br/><br/>
</表单>

完整的错误信息

Servlet.service() for servlet [dispatcherServlet] in context with path [] 抛出异常 [Request processing failed;嵌套异常是 org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "index" - line 86, col 32)] 与根本原因

索引"- 第 86 行，第 32 列)] 在 HTML 表单中是这样的 ->

 这个解决方案，但它对我不起作用
知道如何解决这个问题吗?谢谢
解决方案
乍一看，
 缺少结束标记，Thymeleaf 处理器可能会抱怨.
应该是This question but it didn't work for me

pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>mz.painting</groupId>
    <artifactId>mz</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>M&amp;Z Painting</name>
    <description>Web Application for M&amp;Z </description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring5</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
        </dependency>

        <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
Controller Update
@Controller
 public class SavingUser{

    @Autowired
    private UserRepository userRepository;

    @GetMapping("/addUser")
    public String addUser(Model model){
        System.out.println("Adding User in registration page..");
        model.addAttribute("user", new Customer());
        return "service";

    }


    @PostMapping("/registerUser")
    public String userRegistration(@ModelAttribute Customer user, Model model){
        System.out.println("User in registration page..");
        model.addAttribute("user", user);
//        userRepository.save(user);
        return "redirect:/service";

    }

**Bean Class**
    Getters()
    Setters()
    toString()
HTML Form
    <div id="form">
        <form action="registerUser" th:action="@{/registerUser}"  
     th:object="${user}" method="POST">
            <br />
            <label>Your Name:</label><br />
            <input type="text" th:field="*{name}"  placeholder="" /><br>


            <label >Your Suburb</label><br />
            <input type="text"  th:field="*{suburb}"  placeholder="" /><br />

            <label>Email</label><br/>
            <input type="email" th:field="*{email}"  placeholder="" /><br />

            <label>Phone</label><br/>
            <input type="tel" th:field="*{phone}" placeholder="" /><br />

            <label>Please tell us how we can help</label><br />
            <textarea type="text" th:field="*{text}" rows="10" cols="40"></textarea><br />
            <div>
                <input class="submit" type="submit" value="Submit"  /><br/><br/>
            </div>
        </form>
    </div>
Full Error Message
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "index" - line 86, col 32)] with root cause
"index" - line 86, col 32)] in HTML Form is this ->
            <input type="text" th:field="*{name}"  placeholder="" /><br>
I also checked this solution and it didn't work for me
Any idea how to fix this ?  thank you
解决方案
At first glance, the <br> is missing the closing tag and Thymeleaf processor may complain about it.
It should be
<input type="text" th:field="*{name}"  placeholder="" /><br />. Note the ending slash of <br />.
You cut out the exception message exactly where it would specify the actual cause, namely after with root cause [...]. :)

                        
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