java MustacheException：第15行没有名为“Id”的方法或字段。白标错误页
我正在使用MySQL版本15.1发行版10.1.38-MariaDB，用于debian linux gnu（x86_64）。 打开JDK1.8.0 弹簧靴2.1.4版本
访问我的应用程序时，我在我的白色标签页面上得到了这个stacktrace：
This application has no explicit mapping for /error, so you are seeing
this as a fallback.
Mon May 27 16:12:06 AZOST 2019
There was an unexpected error (type=Internal Server Error, status=500).
No method or field with name 'id' on line 15
com.samskivert.mustache.MustacheException$Context: No method or field
with name 'id' on line 15
at com.samskivert.mustache.Template.checkForMissing(Template.java:326)
at com.samskivert.mustache.Template.getValue(Template.java:234)
at com.samskivert.mustache.Template.getValueOrDefault(Template.java:279)
at com.samskivert.mustache.Mustache$VariableSegment.execute(Mustache.java:802)
at com.samskivert.mustache.Mustache$BlockSegment.executeSegs(Mustache.java:845)
at com.samskivert.mustache.Mustache$SectionSegment.execute(Mustache.java:881)
at com.samskivert.mustache.Template.executeSegs(Template.java:157)
at com.samskivert.mustache.Template.execute(Template.java:134)
at org.springframework.boot.web.servlet.view.MustacheView.renderMergedTemplateModel(MustacheView.java:81)
at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:178)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
这是我的代码：
梅因。胡子
<html>
<body>
<div>
<form method="POST">
<input type ="text" name="text" placeholder="Введите сообщение" />
<input type ="text" name="tag" placeholder="Тег"/>
<button type="submit">Добавить</button>
</form>
</div>
<div>Message list</div>
{{#messages}}
<div>
<b>{{id}}</b>
<span>{{text}}</span>
<i>{{tag}}</i>
</div>
{{/messages}}
这是我的控制器：
迎宾控制器
package com.example.sweater;
import com.example.sweater.domain.Message;
import com.example.sweater.repos.MessageRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import java.util.Map;
@Controller
public class GreetingsController {
@Autowired
private MessageRepo messageRepo;
@RequestMapping("/greeting")
public String greeting(@RequestParam(name="name", required = false, defaultValue = "World") String name,
Map<String, Object> model)
{
model.put("name", name);
return "greeting";
}
@GetMapping
public String main(Map<String, Object> model){
Iterable<Message> messages = messageRepo.findAll();
model.put("messages", "messages");
return "main";
}
@PostMapping
public String add(@RequestParam String text, @RequestParam String tag, Map<String, Object> model){
Message message = new Message(text, tag);
messageRepo.save(message);
Iterable<Message> messages = messageRepo.findAll();
model.put("messages", messages);
return "main";
}
}
我希望这段代码显示HTML代码，其中有空字段等待我填写，访问数据库并显示所有键入空字段的元组，但我遇到了这个stacktrace。我应该修复什么以使其正常工作
# 1 楼答案
从堆栈跟踪可以看出，您正在传递要在模板中迭代的
messages：但是从控制器返回的消息模型可能缺少“id”值。如果我们没有给Mustache页面上的{id}赋值，jmustache将抛出上面的错误消息。请检查主方法返回的数据是否正确返回。或者在模板中将该值标记为可选
如果没有，请检查以下内容： 确保您已正确配置了胡须。确保在pom中添加了以下依赖项：
还要确保所有动态html内容都保存在目录中：
文件夹，这样spring就会把它拿起来