freemarker的classic_compatible

最近在整合springboot和freemarker。在这过程中遇到了一个奇怪的问题.

我匹配下面这个请求:

@RequestMapping(value="/login",method=RequestMethod.GET)    public String loginget() {        return "pages/pub/login";    }

如果访问成功就是访问到了下面这个login.html文件

application.yml如下：

server:  port: 8081spring:  application:    name: springboot-freemarker-demo  resources:  #比如你要把static文件放在e盘的learn目录下    static-locations: file:///E:/learn/static/    freemarker:    content-type: text/html    suffix: .html

浏览器访问结果

一看控制台，原来是报错了

freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:==> res  [in template "pages/global/jscss.html" at line 1, column 33]----Tip: If the failing expression is known to be 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</#if>. (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: ${res}  [in template "pages/global/jscss.html" at line 1, column 31]    - Reached through: #include "/pages/global/jscss.html"  [in template "pages/pub/login.html" at line 4, column 1]----    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) ~[freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:451) ~[freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.EvalUtil.coerceModelToStringOrMarkup(EvalUtil.java:374) ~[freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:96) ~[freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.DollarVariable.accept(DollarVariable.java:59) ~[freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.visit(Environment.java:327) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.visit(Environment.java:333) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.include(Environment.java:2509) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Include.accept(Include.java:171) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.visit(Environment.java:327) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.visit(Environment.java:333) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.core.Environment.process(Environment.java:306) [freemarker-2.3.25-incubating.jar:2.3.25]    at freemarker.template.Template.process(Template.java:386) [freemarker-2.3.25-incubating.jar:2.3.25]    at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:367) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:284) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:234) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:89) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410) [tomcat-embed-core-8.5.5.jar:8.5.5]    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.5.jar:8.5.5]    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.7.0_80]    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.7.0_80]    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.5.jar:8.5.5]    at java.lang.Thread.run(Unknown Source) [na:1.7.0_80]2017-06-14 20:41:52.384 ERROR 5356 --- [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 freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:==> res  [in template "pages/global/jscss.html" at line 1, column 33]----Tip: If the failing expression is known to be 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</#if>. (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: ${res}  [in template "pages/global/jscss.html" at line 1, column 31]    - Reached through: #include "/pages/global/jscss.html"  [in template "pages/pub/login.html" at line 4, column 1]----] with root cause

最后原来是，我的applicaiton.yml文件少配了一个freemarker的配置:

server:  port: 8081spring:  application:    name: springboot-freemarker-demo  resources:  #比如你要把static文件放在e盘的learn目录下    static-locations: file:///E:/learn/static/    freemarker:    content-type: text/html    suffix: .html    #加上下面两行，问题就解决了    settings:      classic_compatible: true