今天使用Spring Boot创建了一个项目，完成代码编写后，将项目打包成jar。但是，在命令行使用 java -jar 的方式去启动项目时，抛出如下错误：
2020-02-12 17:17:21.357 DEBUG 17156 --- [ main] o.s.w.s.v.f.FreeMarkerConfigurer : Cannot resolve template loader path [classpath:/templates/] to [java.io.File]: using SpringTemplateLoader as fallback java.io.FileNotFoundException: class path resource [templates/] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/D:/firefighting_v1.0/firefighting.jar!/BOOT-INF/classes!/templates/ at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:217) ~[spring-core-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:154) ~[spring-core-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.ui.freemarker.FreeMarkerConfigurationFactory.getTemplateLoaderForPath(FreeMarkerConfigurationFactory.java:345) [spring-context-support-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.ui.freemarker.FreeMarkerConfigurationFactory.createConfiguration(FreeMarkerConfigurationFactory.java:297) [spring-context-support-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer.afterPropertiesSet(FreeMarkerConfigurer.java:120) [spring-webmvc-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) [spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.1.RELEASE.jar!/:5.2.1.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.1.RELEASE.jar!/:2.2.1.RELEASE] at com.gosun.health.HealthFireFightingApplication.main(HealthFireFightingApplication.java:11) ~[classes!/:1.0.0-SNAPSHOT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_171] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_171] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_171] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[firefighting.jar:1.0.0-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[firefighting.jar:1.0.0-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) ~[firefighting.jar:1.0.0-SNAPSHOT] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) ~[firefighting.jar:1.0.0-SNAPSHOT]
首先，这不是错误信息，而是一个DEBUG日志信息。因此并不会影响我们程序当运行，你依然能够使用项目访问地址访问项目。如果你看这个DEBUG信息不顺眼，可以通过 application.properties 进行配置。配置如下：
# log config logging.level.web=debug
直接将 debug 改为 info 等其他日志级别即可。
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这tm是服务访问不到你的文件资源，你在这改log级别,讲真人才
非常感谢你的评论。从上面输出的日志，的确“java.io.FileNotFoundException”表示文件资源没有找到，但是输出这条日志采用的是DEBUG级别，意味着并不是一个错误，只是一个调试信息，只要服务能够正常访问，可以不理会。除非 Spring Boot 错误的将 Error 级别日志写成了 Debug 级别日志。