解决办法：

找到：
Tomcat运行时异常:Illegal access: this web application instance has been stopped already._tomcat

在server.xml内加入下面这句话：

<Context path="/expert" docBase="expert" debug="0" reloadable="false"></Context>

注意加的位置，在server标签内

Tomcat运行时异常:Illegal access: this web application instance has been stopped already._tomcat_02
然后重启Tomcat即可。