如果STS为热部署，有时会出现java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.mysql.jdbc.profiler.ProfilerEventHandlerFactory]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.错误；解决方法：
修改tomcat目录下conf文件夹下的server.xml, 在标签添加子元素找到标签，把reloadble的属性值设为：reloadable=“false”.即可。
