错误描述：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:179)
at com.lyy.springboot.SpringBoot06DataMybatisApplication.main(SpringBoot06DataMybatisApplication.java:12)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more
出现错误的原因是——缺少 commons-logging.jar 包，只需在maven中央仓库中搜索下载commons-logging.jar，之后再导入你的java工程中即可！
仓库地址：mvnrepository.com/artifact/co…
或者下载jar：commons.apache.org/proper/comm…
