之前Tomcat一直运行正常，重启之后一直报以下错误信息：
13-Jun-2019 19:46:13.000 SEVERE [Catalina-startStop-1] A child container failed during start
: : Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at (:122)
at (:192)
at (:945)
at (:871)
at (:145)
at $(:1410)
at $(:1400)
at (:266)
at (:1149)
at $(:624)
at (:748)
Caused by: : Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at (:162)
... 6 more
Caused by: : Failed to start component [@17084012]
打开tomcat安装目录编辑conf/配置文件，注释下面内容，重启即可：
<!-- <Context path="" docBase="..." reloadable="true"/> -->