jedi3506 opened a new issue #724:
URL: https://github.com/apache/servicecomb-pack/issues/724


   以前这个bug也有人提过,即是:如果访问管理后台 http://localhost:8090,则提示错误:
   F][http-nio-8090-exec-1] Exception processing template "index": Exception 
evaluating SpringEL expression: "systemInfo.upTime" (template: "index" - line 
257, col 39)
   org.thymeleaf.exceptions.TemplateProcessingException: Exception evaluating 
SpringEL expression: "systemInfo.upTime" (template: "index" - line 257, col 39)
           at 
org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:290)
           at 
org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
           at 
org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
           at 
org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
           at 
org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
           at 
org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
           at 
org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74)
           at 
org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95)
           at 
org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633)
           at 
org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314)
           at 
org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
           at org.thymeleaf.engine.Model.process(Model.java:282)
           at 
org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1587)
           at 
org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
           at org.thymeleaf.engine.Model.process(Model.java:282)
           at 
org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1587)
           at 
org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205)
           at org.thymeleaf.engine.Model.process(Model.java:282)
           at org.thymeleaf.engine.Model.process(Model.java:290)
           at 
org.thymeleaf.engine.GatheringModelProcessable.process(GatheringModelProcessable.java:78)
           at 
org.thymeleaf.engine.ProcessorTemplateHandler.handleCloseElement(ProcessorTemplateHandler.java:1640)
           at 
org.thymeleaf.engine.CloseElementTag.beHandled(CloseElementTag.java:139)
           at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136)
           at 
org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:661)
           at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
           at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
           at 
org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362)
           at 
org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189)
           at 
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1371)
           at 
org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1117)
           at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1056)
           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.servlet.resource.ResourceUrlEncodingFilter.doFilter(ResourceUrlEncodingFilter.java:63)
           at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
           at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
           at 
org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:88)
           at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
           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:109)
           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:109)
           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:109)
           at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
           at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
           at 
org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:114)
           at 
org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:104)
           at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)
           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:109)
           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:202)
           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:853)
           at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
           at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
           at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
           at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
           at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
           at java.lang.Thread.run(Unknown Source)
   Caused by: org.springframework.expression.spel.SpelEvaluationException: 
EL1007E: Property or field 'upTime' cannot be found on null
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:406)
           at 
org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:90)
           at 
org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:109)
           at 
org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:328)
           at 
org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:263)
           ... 85 more
   2021-10-07 03:33:48.530 ERROR SK-20210601AGYI --- [nio-8090-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.TemplateProcessingException: Exception evaluating 
SpringEL expression: "systemInfo.upTime" (template: "index" - line 257, col 
39)] with root cause
   org.springframework.expression.spel.SpelEvaluationException: EL1007E: 
Property or field 'upTime' cannot be found on null
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference.access$000(PropertyOrFieldReference.java:51)
           at 
org.springframework.expression.spel.ast.PropertyOrFieldReference$AccessorLValue.getValue(PropertyOrFieldReference.java:406)
           at 
org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:90)
           at 
org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:109)
           at 
org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:328)
           at 
org.thymeleaf.spring5.expression.SPELVariableExpressionEvaluator.evaluate(SPELVariableExpressionEvaluator.java:263)
           at 
org.thymeleaf.standard.expression.VariableExpression.executeVariableExpression(VariableExpression.java:166)
           at 
org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:66)
           at 
org.thymeleaf.standard.expression.Expression.execute(Expression.java:109)
           at 
org.thymeleaf.standard.expression.Expression.execute(Expression.java:138)
           at 
org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144)
           at 
org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.ja


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