博客报错了 （解决办法）

系列文章目录

往期文章
 第一章：日常_JAVA_面试题集1（含答案）
 第二章：日常_JAVA_面试题集2（含答案）
 第三章：日常_JAVA_面试题集3（含答案）
 第四章：日常_JAVA_面试题集4（含答案）
 第四章：日常_JAVA_面试题集8（含答案）
 往期文章大全……

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@[TOC](博客报错了)

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前言

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提示：以下是本篇文章正文内容，下面案例可供参考

一、博客报错了

FreeMarker template error (DEBUG mode; use RETHROW in production!): The following has evaluated to null or missing: ==> data [in template “pc/template/header.ftl” at line 3, column 30] ---- Tip: If the failing expression is known to legally refer to something that’s sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: #assign blogModelDataInfo = data [in template “pc/template/header.ftl” at line 3, column 1] - Reached through: #include “…/template/header.ftl” par… [in template “pc/detail/index.ftl” at line 2, column 1] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [… Exception message was already printed; see it above …] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) at freemarker.core.Assignment.accept(Assignment.java:139) at freemarker.core.Environment.visit(Environment.java:331) at freemarker.core.Environment.visit(Environment.java:337) at freemarker.core.Environment.include(Environment.java:2694) at freemarker.core.Include.accept(Include.java:171) at freemarker.core.Environment.visit(Environment.java:331) at freemarker.core.Environment.visit(Environment.java:337) at freemarker.core.Environment.process(Environment.java:310) at freemarker.template.Template.process(Template.java:383) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:391) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:304) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:255) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:179) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) at javax.servlet.http.HttpServlet.service(HttpServlet.java:503) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) at javax.servlet.http.HttpServlet.service(HttpServlet.java:590) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:760) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1617)atorg.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:226)atorg.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604) at net.csdn.blog.web.filter.CorsFilter.doFilter(CorsFilter.java:52) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1596)atorg.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)atorg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)atorg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)atorg.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:590) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:235) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1607) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1297) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1577) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1212) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)atorg.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)atorg.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)atorg.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:270)atorg.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)atorg.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)atorg.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)atorg.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)atorg.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)atorg.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:388) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.lang.Thread.run(Thread.java:748)

二、解决办法

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