Spring Boot 项目，在 Spring Tool Suite 4, Version: 4.4.0.RELEASE 运行没有问题，将项目中的静态资源和页面复制到 IDEA 的项目中，除了 IDE 不同，其他基本相同。

运行 IDEA 中的项目，然后访问，出现异常：

Exception processing template "index": An error happened during template parsing (template: "class path resource [templates/index.html]")

具体异常：

  1 2019-12-10 21:37:40.896 ERROR 10276 --- [nio-8081-exec-1] org.thymeleaf.TemplateEngine             : [THYMELEAF][http-nio-8081-exec-1] Exception processing template "index": An error happened during template parsing (template: "class path resource [templates/index.html]")

  2

  3 org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/index.html]")

  4     at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241)

  5     at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100)

  6     at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666)

  7     at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)

  8     at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)

  9     at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362)

 10     at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189)

 11     at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)

 12     at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)

 13     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)

 14     at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)

 15     at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)

 16     at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)

 17     at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)

 18     at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)

 19     at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

 20     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

 21     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

 22     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

 23     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

 24     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

 25     at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)

 26     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

 27     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

 28     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

 29     at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)

 30     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

 31     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

 32     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

 33     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)

 34     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

 35     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

 36     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

 37     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)

 38     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

 39     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)

 40     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

 41     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

 42     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)

 43     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

 44     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)

 45     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)

 46     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)

 47     at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)

 48     at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

 49     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

 50     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

 51     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

 52     at java.lang.Thread.run(Thread.java:748)

 53 Caused by: org.attoparser.ParseException: Error resolving template [_fragment], template might not exist or might not be accessible by any of the configured Template Resolvers (template: "index" - line 3, col 11)

 54     at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:393)

 55     at org.attoparser.MarkupParser.parse(MarkupParser.java:257)

 56     at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230)

 57     ... 48 common frames omitted

 58 Caused by: org.thymeleaf.exceptions.TemplateInputException: Error resolving template [_fragment], template might not exist or might not be accessible by any of the configured Template Resolvers (template: "index" - line 3, col 11)

 59     at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869)

 60     at org.thymeleaf.engine.TemplateManager.parseStandalone(TemplateManager.java:250)

 61     at org.thymeleaf.standard.expression.FragmentExpression.resolveExecutedFragmentExpression(FragmentExpression.java:588)

 62     at org.thymeleaf.standard.processor.AbstractStandardFragmentInsertionTagProcessor.computeFragment(AbstractStandardFragmentInsertionTagProcessor.java:379)

 63     at org.thymeleaf.standard.processor.AbstractStandardFragmentInsertionTagProcessor.doProcess(AbstractStandardFragmentInsertionTagProcessor.java:110)

 64     at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)

 65     at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)

 66     at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)

 67     at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)

 68     at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleOpenElementEnd(TemplateHandlerAdapterMarkupHandler.java:304)

 69     at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleOpenElementEnd(InlinedOutputExpressionMarkupHandler.java:278)

 70     at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleOpenElementEnd(OutputExpressionInlinePreProcessorHandler.java:186)

 71     at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleOpenElementEnd(InlinedOutputExpressionMarkupHandler.java:124)

 72     at org.attoparser.HtmlElement.handleOpenElementEnd(HtmlElement.java:109)

 73     at org.attoparser.HtmlMarkupHandler.handleOpenElementEnd(HtmlMarkupHandler.java:297)

 74     at org.attoparser.MarkupEventProcessorHandler.handleOpenElementEnd(MarkupEventProcessorHandler.java:402)

 75     at org.attoparser.ParsingElementMarkupUtil.parseOpenElement(ParsingElementMarkupUtil.java:159)

 76     at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:710)

 77     at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)

 78     ... 50 common frames omitted

 79

 80 2019-12-10 21:37:40.900 ERROR 10276 --- [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/index.html]")] with root cause

 81

 82 org.thymeleaf.exceptions.TemplateInputException: Error resolving template [_fragment], template might not exist or might not be accessible by any of the configured Template Resolvers (template: "index" - line 3, col 11)

 83     at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869)

 84     at org.thymeleaf.engine.TemplateManager.parseStandalone(TemplateManager.java:250)

 85     at org.thymeleaf.standard.expression.FragmentExpression.resolveExecutedFragmentExpression(FragmentExpression.java:588)

 86     at org.thymeleaf.standard.processor.AbstractStandardFragmentInsertionTagProcessor.computeFragment(AbstractStandardFragmentInsertionTagProcessor.java:379)

 87     at org.thymeleaf.standard.processor.AbstractStandardFragmentInsertionTagProcessor.doProcess(AbstractStandardFragmentInsertionTagProcessor.java:110)

 88     at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)

 89     at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)

 90     at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)

 91     at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)

 92     at org.thymeleaf.engine.TemplateHandlerAdapterMarkupHandler.handleOpenElementEnd(TemplateHandlerAdapterMarkupHandler.java:304)

 93     at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler$InlineMarkupAdapterPreProcessorHandler.handleOpenElementEnd(InlinedOutputExpressionMarkupHandler.java:278)

 94     at org.thymeleaf.standard.inline.OutputExpressionInlinePreProcessorHandler.handleOpenElementEnd(OutputExpressionInlinePreProcessorHandler.java:186)

 95     at org.thymeleaf.templateparser.markup.InlinedOutputExpressionMarkupHandler.handleOpenElementEnd(InlinedOutputExpressionMarkupHandler.java:124)

 96     at org.attoparser.HtmlElement.handleOpenElementEnd(HtmlElement.java:109)

 97     at org.attoparser.HtmlMarkupHandler.handleOpenElementEnd(HtmlMarkupHandler.java:297)

 98     at org.attoparser.MarkupEventProcessorHandler.handleOpenElementEnd(MarkupEventProcessorHandler.java:402)

 99     at org.attoparser.ParsingElementMarkupUtil.parseOpenElement(ParsingElementMarkupUtil.java:159)

100     at org.attoparser.MarkupParser.parseBuffer(MarkupParser.java:710)

101     at org.attoparser.MarkupParser.parseDocument(MarkupParser.java:301)

102     at org.attoparser.MarkupParser.parse(MarkupParser.java:257)

103     at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:230)

104     at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100)

105     at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666)

106     at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)

107     at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)

108     at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362)

109     at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189)

110     at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)

111     at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)

112     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)

113     at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)

114     at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)

115     at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)

116     at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)

117     at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)

118     at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)

119     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

120     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

121     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

122     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

123     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

124     at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)

125     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

126     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

127     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

128     at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)

129     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

130     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

131     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

132     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)

133     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)

134     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

135     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

136     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)

137     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)

138     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)

139     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)

140     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)

141     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)

142     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)

143     at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)

144     at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)

145     at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)

146     at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)

147     at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

148     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

149     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

150     at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

151     at java.lang.Thread.run(Thread.java:748)

起初是直接运行项目，即 Shift + F10：

后来重新编译项目，再访问，就没有出现异常：

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