Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception 异常

参考文章

https://jiming.blog.csdn.net/article/details/103185972

其他文章

https://blog.csdn.net/weixin_44259720/article/details/95996829
https://blog.csdn.net/weixin_44259720/article/details/104541167