问题1

super() 和this()为什么要放在构造函数的第一个语句

https://blog.csdn.net/fengxuanyuan2/article/details/48279315

https://zhidao.baidu.com/question/332236048952469525.html

用feign的时候，

Servlet.service() for servlet [dispatcherServlet] in context with path [] 报错解决  

 这个https://blog.csdn.net/sinat_35566306/article/details/90312461

'feign.codec.DecodeException'  实体加上空构造器

https://blog.csdn.net/ityqing/article/details/84620669