springboot启动报java.io.FileNotFoundException:问题解决
2020-05-29 16:13:14.844 INFO 2896 --- [ main] com.baizhi.yxh.YingxueYxhApplication : Starting YingxueYxhApplication on DESKTOP-NMOCS9G with PID 2896 (G:\ideaWorkSpace\yingxue_yxh\target\classes started by job in G:\ideaWorkSpace\yingxue_yxh)
2020-05-29 16:13:14.860 INFO 2896 --- [ main] com.baizhi.yxh.YingxueYxhApplication : No active profile set, falling back to default profiles: default
2020-05-29 16:13:15.969 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : Skipping MapperFactoryBean with name 'adminDao' and 'com.baizhi.yxh.dao.AdminDao' mapperInterface. Bean already defined with the same name!
2020-05-29 16:13:15.969 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : Skipping MapperFactoryBean with name 'categoryMapper' and 'com.baizhi.yxh.dao.CategoryMapper' mapperInterface. Bean already defined with the same name!
2020-05-29 16:13:15.969 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : Skipping MapperFactoryBean with name 'userMapper' and 'com.baizhi.yxh.dao.UserMapper' mapperInterface. Bean already defined with the same name!
2020-05-29 16:13:15.969 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : Skipping MapperFactoryBean with name 'videoMapper' and 'com.baizhi.yxh.dao.VideoMapper' mapperInterface. Bean already defined with the same name!
2020-05-29 16:13:15.969 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : No MyBatis mapper was found in '[com.baizhi.yxh.dao]' package. Please check your configuration.
2020-05-29 16:13:16.125 WARN 2896 --- [ main] o.m.s.mapper.ClassPathMapperScanner : No MyBatis mapper was found in '[com.baizhi.yxh]' package. Please check your configuration.
2020-05-29 16:13:17.032 INFO 2896 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8181 (http)
2020-05-29 16:13:17.094 INFO 2896 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-05-29 16:13:17.094 INFO 2896 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.21]
2020-05-29 16:13:17.704 WARN 2896 --- [ main] o.a.tomcat.util.scan.StandardJarScanner : Failed to scan [file:/C:/Users/job/.m2/repository/org/bytedeco/javacv/0.8/javacpp.jar] from classloader hierarchy
java.io.FileNotFoundException: C:\Users\job\.m2\repository\org\bytedeco\javacv\0.8\javacpp.jar (系统找不到指定的文件。)
at java.util.zip.ZipFile.open(Native Method) ~[na:1.8.0_121]
at java.util.zip.ZipFile.(ZipFile.java:219) ~[na:1.8.0_121]
at java.util.zip.ZipFile.(ZipFile.java:149) ~[na:1.8.0_121]
at java.util.jar.JarFile.(JarFile.java:166) ~[na:1.8.0_121]
at java.util.jar.JarFile.(JarFile.java:130) ~[na:1.8.0_121]
at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:176) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.JarFileUrlJar.(JarFileUrlJar.java:65) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.JarFactory.newInstance(JarFactory.java:49) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:374) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.StandardJarScanner.processURLs(StandardJarScanner.java:309) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.StandardJarScanner.doScanClassPath(StandardJarScanner.java:266) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:229) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262) [tomcat-embed-jasper-9.0.21.jar:9.0.21]
at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:104) [tomcat-embed-jasper-9.0.21.jar:9.0.21]
at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:83) [tomcat-embed-jasper-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5132) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_121]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_121]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_121]
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) [tomcat-embed-core-9.0.21.jar:9.0.21]
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) [na:1.8.0_121]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.apache.catalina.startup.Tomcat.start(Tomcat.java:456) [tomcat-embed-core-9.0.21.jar:9.0.21]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:105) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.(TomcatWebServer.java:86) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:178) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) [spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:742) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:389) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:311) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202) [spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at com.baizhi.yxh.YingxueYxhApplication.main(YingxueYxhApplication.java:13) [classes/:na]
2020-05-29 16:13:17.704 WARN 2896 --- [ main] o.a.tomcat.util.scan.StandardJarScanner : Failed to scan [file:/C:/Users/job/.m2/repository/org/bytedeco/javacv/0.8/opencv.jar] from classloader hierarchy
问题描述
springboot项目启动的时候报错如上所示的警告，虽然不影响项目的正常运行，但是对于一个程序员来说看到如此，如不能解决是在是寝食难安。
这里省略一万个字
解决过程
1，由于项目并未用到这几个jar包（否则项目也不能成功运行），考虑将这几个子包通过pom文件过滤出去，最后失败。
2，没办法只能dubug其报错位置，查找原因，苦于本人技术不精，大概知道，tomcat在加载pom指定的依赖时，还会分析jar包中的classpath路径，但是还是不知怎么解决，于是只能问老师了，百度（并非广告），终于找到解决方案
解决办法
原来已经有大神分析并解决了，由衷 的佩服，问题原因如下：
其实问题就是出Manifest文件中的classpath，通过分析代码我们知道tomcat除了加载了我们maven管理的jar包之外，还会对jar中的manifest文件进行分析，如果其中存在classpath，他会将其中的内容也添加jar包依赖中，并对这些jar包进行加载。
知道原因自然就能解决，将自动解析关掉就好了
@Bean
public TomcatServletWebServerFactory tomcatFactory() {
return new TomcatServletWebServerFactory() {
@Override
protected void postProcessContext(Context context) {
((StandardJarScanner) context.getJarScanner()).setScanManifest(false);
}
};
}
另外附上这位大哥的博客
链接：https://www.jianshu.com/p/7ed2eaffbc18