FreeMarker template error: The following has evaluated to null or missing: ==> item_style [in template "product/product_list_category.ftl" at line 2, column 46] Tip: If the failing expression is known to be legally null/missing, either specify a default value with 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 parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)?? The failing instruction (FTL stack trace): ---------- ==> ${item_style} [in template "product/product_list_category.ftl" at line 2, column 44] @page title="新东方\${categoryName}网络课程_... [in template "product/product_list_category.ftl" at line 1, 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:98) at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:382) at freemarker.core.Expression.evalAndCoerceToString(Expression.java:115) at freemarker.core.DollarVariable.accept(DollarVariable.java:76) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.renderElementToString(Environment.java:1798) at freemarker.core.StringLiteral.evalAndCoerceToString(StringLiteral.java:116) at freemarker.core.StringLiteral._eval(StringLiteral.java:93) at freemarker.core.Expression.eval(Expression.java:111) at freemarker.core.ListLiteral._eval(ListLiteral.java:83) at freemarker.core.Expression.eval(Expression.java:111) at freemarker.core.Environment.visit(Environment.java:646) at freemarker.core.UnifiedCall.accept(UnifiedCall.java:116) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.process(Environment.java:243) at freemarker.template.Template.process(Template.java:277) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283) at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233) at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:264) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1216) at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1001) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:867) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:951) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:842) at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:827) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:404) at com.dianping.cat.servlet.CatFilter$CatHandler$3.handle(CatFilter.java:219) at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402) at com.dianping.cat.servlet.CatFilter$CatHandler$4.handle(CatFilter.java:314) at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402) at com.dianping.cat.servlet.CatFilter$CatHandler$2.handle(CatFilter.java:202) at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402) at com.dianping.cat.servlet.CatFilter$CatHandler$1.handle(CatFilter.java:110) at com.dianping.cat.servlet.CatFilter$Context.handle(CatFilter.java:402) at com.dianping.cat.servlet.CatFilter.doFilter(CatFilter.java:48) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176) at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:410) at org.apache.catalina.core.ApplicationDispatcher.forward$original$r2ahzWwv(ApplicationDispatcher.java:337) at org.apache.catalina.core.ApplicationDispatcher.forward$original$r2ahzWwv$accessor$8aAEEEhp(ApplicationDispatcher.java) at org.apache.catalina.core.ApplicationDispatcher$auxiliary$fcBIrcWZ.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java) at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213) at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171) at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.koolearn.sso.filter.SSOLoginFilter.handleLogout(SSOLoginFilter.java:643) at com.koolearn.sso.filter.SSOLoginFilter.handleLogout(SSOLoginFilter.java:541) at com.koolearn.sso.filter.SSOLoginFilter.doFilter(SSOLoginFilter.java:392) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.koolearn.wapclass.filter.RefererFilter.doFilter(RefererFilter.java:62) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at com.koolearn.monitor.exporter.filter.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:44) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke$original$LDfb9QJW(StandardHostValve.java:169) at org.apache.catalina.core.StandardHostValve.invoke$original$LDfb9QJW$accessor$mV07pnqb(StandardHostValve.java) at org.apache.catalina.core.StandardHostValve$auxiliary$SeDCwDKw.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:683) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$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) 404
404