Thymeleaf和Spring MVC中的错误形式绑定-Java 学习之路

我是从Thymeleaf开始的 . 我刚刚复制了一个例子并根据我的需要进行了调整 . 但它不起作用 . 我感谢任何帮助 .

标签

@Entity 
public class Label {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "label_id")
private Long labelId;

private String label;

public Label() {
}

public Label(Long labelId, String label) {

    this.labelId = labelId;
    this.label = label;
}

public Label(String label) {

    this.labelId = null;
    this.label = label;
}


public Long getLabelId() {
    return labelId;
}

public void setLabelId(Long labelId) {
    this.labelId = labelId;
}

public String getLabel() {
    return label;
}

public void setLabel(String label) {
    this.label = label;
}

@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof Label)) return false;

    Label label1 = (Label) o;

    return getLabel().equals(label1.getLabel());
}

@Override
public int hashCode() {

    return Objects.hash(getLabel());
}

@Override
public String toString() {
    return "Label{" +
            "labelId=" + labelId +
            ", label='" + label + '\'' +
            '}';
} }

调节器

@Controller
public class LabelController {


private NoteHandler handler;

@Autowired
public LabelController(NoteHandler handler) {
    this.handler = handler;
}

@RequestMapping(value = "/savelabel", method = RequestMethod.GET)
public String showSaveLabelForm(Model model) {
    model.addAttribute("labelentity", new Label());
    return "labelform";
}

@RequestMapping(value = "/savelabel", method = RequestMethod.POST)
public String submitLabel(@ModelAttribute Label labelentity) {
    return "result";
}    }

labelform.html

> <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <head>
>     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
>     <title>Save a New Label</title> </head> <body> <h1>Form</h1> 
><form action="#" th:action="@{/savelabel}" th:object="${labelentity}" method="post">
>     <p>Id: <input type="text" th:field="*{labelId}" /></p>
>     <p>Label: <input type="text" th:field="*{label}" /></p>
>     <p><input type="submit" value="Submit" /> <input type="reset" 
>value="Reset" /></p> </form> </body> </html>

result.html

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Saved Label</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>Result</h1>
<p th:text="'id: ' + ${labelentity.labelId}" />
<p th:text="'label: ' + ${labelentity.label}" />
<a href="/savelabel">Save another label</a>
</body>
</html>

问题：我去labelform页面，填入1到 ID 字段，abc到 label ，我提交，它给了我错误

出现意外错误（type = Bad Request，status = 400） . 无法将'java.lang.String'类型的值转换为必需类型'krystof.business.Label';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：“abc”

我猜 label 被错误地绑定到 labelId . 为什么？感谢帮助 .

控制台输出：

...

：找到资源处理程序映射：URL pattern =“/ webjars /”，locations = [类路径资源[META-INF / resources / webjars /]]，解析器= [org.springframework.web.servlet.resource.PathResourceResolver@349312d5 ] 2017-12-29 14：58：30.488 DEBUG 5492 --- [main] oswsresource.ResourceUrlProvider：找到资源处理程序映射：URL pattern =“/”，locations = [ServletContext资源[/]，类路径资源[META] -INF / resources /]，类路径资源[resources /]，类路径资源[静态/]，类路径资源[公共/]]，解析器= [org.springframework.web.servlet.resource.PathResourceResolver@5885e231] 2017 -12-29 14：58：30.573 INFO 5492 --- [main] sbcetTomcatEmbeddedServletContainer：Tomcat在端口上启动：8080（http）2017-12-29 14：58：30.574 DEBUG 5492 --- [主要] oswcsStandardServletEnvironment：添加具有最高搜索优先级的PropertySource'server.ports'2017-12-29 14：58：30.579 INFO 5492 --- [main] krystof.App：在8.625秒内启动应用程序（JVM运行9.133） 2017-12-29 14：58：39.455 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：初始化servlet'dispatcherServlet'2017-12-29 14：58：39.460 INFO 5492 - - [nio-8080-exec-2] oaccC [Tomcat] . [localhost] . [/]：初始化Spring FrameworkServlet'dispatcherServlet'2017-12-29 14：58：39.460 INFO 5492 --- [nio-8080-exec -2] osweb.servlet.DispatcherServlet：FrameworkServlet'dispatcherServlet'：初始化开始2017-12-29 14：58：39.460 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：使用MultipartResolver [org.springframework.web.multipart.support.StandardServletMultipartResolver@6ad6ae45] 2017-12-29 14：58：39.464 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：无法找到LocaleResolver名称为'localeResolver'：使用默认值[org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver@19ac22ef] 2017-12-29 14：58：39.477 DEBUG 5492 --- [nio-8080-exec-2] osweb . servlet.DispatcherServlet：无法找到ThemeRes名称为'themeResolver'的olver：使用默认值[org.springframework.web.servlet.theme.FixedThemeResolver@2ba12e19] 2017-12-29 14：58：39.484 DEBUG 5492 --- [nio-8080-exec-2] osweb .servlet.DispatcherServlet：无法找到名为'viewNameTranslator'的RequestToViewNameTranslator：使用默认[org.springframework.web.servlet.view.DefaultRequestToViewNameTranslator@4aca5c03] 2017-12-29 14：58：39.493 DEBUG 5492 --- [nio- 8080-exec-2] osweb.servlet.DispatcherServlet：无法找到名为'flashMapManager'的FlashMapManager：使用默认值[org.springframework.web.servlet.support.SessionFlashMapManager@6434e440] 2017-12-29 14：58：39.494 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：发布了servlet'dispatcherServlet'的WebApplicationContext作为ServletContext属性，名称为[org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcherServlet] 2017- 12-29 14：58：39.494 INFO 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：FrameworkSer vlet'dismpatcherServlet'：初始化完成时间为34 ms 2017-12-29 14：58：39.494 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：Servlet'discesscherServlet'已成功配置2017-12 -29 14：58：39.512 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：名为'dispatcherServlet'的DispatcherServlet处理[/ savelabel]的POST请求2017-12-29 14:58 ：39.517 DEBUG 5492 --- [nio-8080-exec-2] swsmmaRequestMappingHandlerMapping：查找path / savelabel的处理程序方法2017-12-29 14：58：39.520 DEBUG 5492 --- [nio-8080-exec-2 ] swsmmaRequestMappingHandlerMapping：返回处理程序方法[public java.lang.String krystof.Controller.LabelController.submitLabel（krystof.business.Label）] 2017-12-29 14：58：39.542 DEBUG 5492 --- [nio-8080-exec -2] osweb.cors.DefaultCorsProcessor：跳过CORS处理：请求来自同一个来源2017-12-29 14：58：39.578 DEBUG 5492 --- [nio-8080-exec-2] .wsmmaServletInvocableHandlerMethod：Fa iled解决'krystof.business.Label'类型的参数0org.springframework.beans.TypeMismatchException：无法将类型'java.lang.String'的值转换为必需类型'krystof.business.Label';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：org.springframework.beans.TypeConverterSupport.doConvert中的“abc”（TypeConverterSupport.java:71）〜[spring-beans-4.3.13.RELEASE.jar：4.3.13 .RELEASE] org.springframework.valid.Fringframework.valid.Fringframework.valid.Fringframework.valid.Fringframework.valid.Fringframework.valid.Rring （DataBinder.java:713）〜[spring-context-4.3.13.RELEASE.jar：4.3.13.RELEASE]在org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttributeFromRequestValue（ServletModelAttributeMethodProcessor.java： 137）〜[spring-webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute（ServletModelAttributeMethodProcessor.java:75）〜[spring -webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org.springframework.web.method.annotation.ModelAttributeMethodP org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument（HandlerMethodArgumentResolverComposite.java:121）中的rocessor.resolveArgument（ModelAttributeMethodProcessor.java:106）〜[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] ）〜[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues（InvocableHandlerMethod.java:158）[spring-web-4.3.13 .RELEASE.jar：4.3.13.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:128）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE在org.springframework上的org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:97）[spring-webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] . web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:827)[chring-webmvc- 4.3.13.REL EASE.jar：4.3.13.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:738）[spring-webmvc-4.3.13.RELEASE.jar：4.3 . 13.RELEASE] org.springframework上的org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:85）[spring-webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java）中的.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:967)[chring-webmvc- 4.3.13.RELEASE.jar:4.3.13.RELEASE ：901）[spring-webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:970)[chring-webmvc-4.3.13 . RELEASE.jar：4.3.13.RELEASE]在javax的org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:872）[spring-webmvc-4.3.13.RELEASE.jar：4.3.13.RELEASE] .servlet.http.HttpServlet.service（HttpServle t.java:661）[tomcat-embed-core-8.5.23.jar：8.5.23]在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:846）[spring-webmvc-4.3.13 .RELEASE.jar：4.3.13.RELEASE]在org.apache的javax.servlet.http.HttpServlet.service（HttpServlet.java:742）[tomcat-embed-core-8.5.23.jar：8.5.23] . catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） org.apache.tomcat.websocket.server.WsFilter.doFilter [tomcat-embed-websocket-8.5.23.jar ：8.5.23] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.core . ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.springframework.web.filter.RequestContextFilter .doFilterInternal（RequestContextFilter.java:99）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring- web-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.23.jar：8.5 . 23] org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal （HttpPutFormContentFilter.java:108）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] atorg.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5 .23.jar：8.5.23] org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:81）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org . springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain . java：193）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.23 .jar：8.5.23]在org.springframework.web .filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:197）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107 ）[spring-web-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）[tomcat-embed-core-8.5.23 . jar：8.5.23] org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）[tomcat-embed-core-8.5.23.jar：8.5.23] org.apache.catalina.core .standardWrapperValve.invoke（StandardWrapperValve.java:199）[tomcat-embed-core-8.5.23.jar：8.5.23] org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）[tomcat- embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:478）[tomcat-embed-core-8.5.23.jar：8.5.23]在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140） org.apache.catalina.valves.ErrorReportValve.invoke [tomcat-embed-core-8.5.23.jar：8.5] .23] org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.catalina.connector.CoyoteAdapter . 服务（CoyoteAdapter.java:342）[tomcat-embed-core-8.5.23.jar：8.5.23]在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:803）[tomcat-embed-core -8.5.23.jar:8.5.23]在org.apache的org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66）[tomcat-embed-core-8.5.23.jar：8.5.23] . coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:868）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint . java：1459）[tomcat-embed-core-8.5.23.jar：8.5.23] at org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）[tomcat-embed-core-8.5 .23.jar： 8.5.23] at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）[na：1.8.0_131] at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617)[na： 1.8.0_131] atg.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-embed-core-8.5.23.jar：8.5.23] at java.lang.Thread .run（Thread.java:748）[na：1.8.0_131]引起：org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型[java.lang.Long] Value 'abc';嵌套异常是java.lang.NumberFormatException：对于输入字符串：org.springframework.core.convert.support.ConversionUtils.invokeConverter中的“abc”（ConversionUtils.java:43）〜[spring-core-4.3.13.RELEASE.jar ：4.3.13.RELEASE] org.springframework.core.convert.support.GenericConversionService.convert（GenericConversionService.java:203）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org org.springframework.data.repository.support中的.springframework.core.convert.support.GenericConversionService.convert（GenericConversionService.java:187）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE] . DomainClassConverter $ ToEntityConverter.convert（DomainClassConverter.java:157）〜[spring-data-commons-1.13.9.RELEASE.jar：na] at org.springframework.core.convert.support.ConversionUtils.invokeConverter（ConversionUtils.java:37 ）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE]在org.springframework.core.convert.support.GenericConversionService.convert（GenericConversionService.java:203）〜[spring-core-4.3 . 1 3.RELEASE.jar：4.3.13.RELEASE]在org.springframework.beans.TypeConverterDelegate.convertIfNecessary（TypeConverterDelegate.java:173）〜[spring-beans-4.3.13.RELEASE.jar：4.3.13.RELEASE] at at org.springframework.beans.TypeConverterDelegate.convertIfNecessary（TypeConverterDelegate.java:108）〜[spring-beans-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.beans.TypeConverterSupport.doConvert（TypeConverterSupport.java）：64）〜[spring-beans-4.3.13.RELEASE.jar：4.3.13.RELEASE] ...省略了56个常见帧引起：java.lang.NumberFormatException：对于输入字符串：java.lang.NumberFormatException中的“abc” . forInputString（NumberFormatException.java:65）〜[na：1.8.0_131] at java.lang.Long.parseLong（Long.java:589）〜[na：1.8.0_131] at java.lang.Long.valueOf（Long . java：803）〜[na：1.8.0_131] at org.springframework.util.NumberUtils.parseNumber（NumberUtils.java:211）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org.springframework.core.convert.support.StringToNumberConverterFactory $ StringToNumber.convert（StringToNumberConverterFactory.java:62）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE] org.springframework.core.convert .support.StringToNumberConverterFactory $ StringToNumber.convert（StringToNumberConverterFactory.java:49）〜[spring-core-4.3.13.RELEASE.jar：4.3.13.RELEASE] at org.springframework.core.convert.support.GenericConversionService $ ConverterFactoryAdapter . convert（GenericConversionService.java:436）〜[sprin org.springframework.core.convert.support.ConversionUtils.invokeConverter（ConversionUtils.java:37）〜[spring-core-4.3.13.RELEASE .jar：4.3.13.RELEASE] ...省略了64个常用帧2017-12-29 14：58：39.579 DEBUG 5492 --- [nio-8080-exec-2] .mmaExceptionHandlerExceptionResolver：解析处理程序中的异常[public java.lang.String krystof.Controller.LabelController.submitLabel（krystof.business.Label）]：org.springframework.beans.TypeMismatchException：无法将类型'java.lang.String'的值转换为所需类型'krystof.business . 标签';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：“abc”2017-12-29 14：58：39.581 DEBUG 5492 --- [nio-8080-exec-2] .wsmaResponseStatusExceptionResolver：解析处理程序中的异常[public java.lang.String krystof.Controller.LabelController.submitLabel（krystof.business.Label）]：org.springframework.beans.TypeMismatchException：无法将类型'java.lang.String'的值转换为所需类型'krystof.business . 标签';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：“abc”2017-12-29 14：58：39.592 DEBUG 5492 --- [nio-8080-exec-2] .wsmsDefaultHandlerExceptionResolver：解析处理程序中的异常[public java.lang.String krystof.Controller.LabelController.submitLabel（krystof.business.Label）]：org.springframework.beans.TypeMismatchException：无法将类型'java.lang.String'的值转换为所需类型'krystof.business . 标签';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：“abc”2017-12-29 14：58：39.593 WARN 5492 --- [nio-8080-exec-2] .wsmsDefaultHandlerExceptionResolver：无法绑定请求元素： org.springframework.beans.TypeMismatchException：无法将类型'java.lang.String'的值转换为必需类型'krystof.business.Label';嵌套异常是org.springframework.core.convert.ConversionFailedException：无法从类型[java.lang.String]转换为类型为'abc'的类型[java.lang.Long];嵌套异常是java.lang.NumberFormatException：对于输入字符串：“abc”2017-12-29 14：58：39.593 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：Null ModelAndView返回to DispatcherServlet，名称为'dispatcherServlet'：假设HandlerAdapter已完成请求处理2017-12-29 14：58：39.594 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：已成功完成请求2017-12 -29 14：58：39.606 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：名为'dispatcherServlet'的DispatcherServlet处理POST请求[/ error] 2017-12-29 14:58 ：39.607 DEBUG 5492 --- [nio-8080-exec-2] swsmmaRequestMappingHandlerMapping：查找路径/错误的处理程序方法2017-12-29 14：58：39.610 DEBUG 5492 --- [nio-8080-exec-2 ] swsmmaRequestMappingHandlerMapping：返回处理程序方法[public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml（java） x.servlet.http.HttpServletRequest，javax.servlet.http.HttpServletResponse）] 2017-12-29 14：58：39.611 DEBUG 5492 --- [nio-8080-exec-2] osweb.cors.DefaultCorsProcessor：Skip CORS处理：请求来自同一个来源2017-12-29 14：58：39.638 DEBUG 5492 --- [nio-8080-exec-2] oswsvContentNegotiatingViewResolver：请求的媒体类型是[text / html，text / html; q = 0.8 ]基于Accept Headers 类型和可生成的媒体类型[text / html]）2017-12-29 14：58：39.654 DEBUG5492 --- [nio-8080-exec-2] oswsvContentNegotiatingViewResolver：根据请求的媒体类型'text / html'返回[org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView@2b999ee8] 2017-12-29 14 ：58：39.654 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：在DispatcherServlet中使用名称为“dispatcherServlet”的渲染视图[org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$SpelView@2b999ee8] '2017-12-29 14：58：39.694 DEBUG 5492 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet：已成功完成请求

1 回答

0

我有点不清楚为什么你看到你做的错误，因为我已经尝试了你的代码

org.springframework.expression.spel.SpelEvaluationException: EL1007E: Property or field 'labelId' cannot be found on null

我怀疑差异在于您可能在列表中编辑过的某些代码 .

然而，问题与以下事实有关：在您的发布请求控制器方法中，您有以下 @ModelAttribute Label labelentity ，这意味着spring将向模型映射添加名称标签的属性，但是您的模板引用了labelentity，因此您需要更改此成为

@ModelAttribute(name = "labelentity")

回复于 2024-04-19T22:38:31+08:00

Thymeleaf和Spring MVC中的错误形式绑定

1 回答

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