前段 时间自己搭建 ssh项目框架的项目，最近有时间重新搭建一套ssh框架的项目，
搭建完后，启动项目的时候报错：Illegal access: this web application instance has been stopped already. Could not load com.mysql.jdbc.Driver. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
翻译： 无法加载Could not load com.mysql.jdbc.Driver（驱动类的问题）
查询项目才发现少导入了mysql的jar 这里是（mysql-connector-java-5.1.21.jar）