2020-02-18 11:07:26.864 ERROR 12160 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Handler dispatch failed; nested exception is java.lang.StackOverflowError] with root cause
java.lang.StackOverflowError: null
at com.hzy.service.UserServiceImpl.queryUserByName(UserServiceImpl.java:20) ~[classes/:na]
at com.hzy.service.UserServiceImpl.queryUserByName(UserServiceImpl.java:20) ~[classes/:na]
at com.hzy.service.UserServiceImpl.queryUserByName(UserServiceImpl.java:20) ~[classes/:na]
at com.hzy.service.UserServiceImpl.queryUserByName(UserServiceImpl.java:20) ~[classes/:na]
检查service层是否是自己调用了自己，形成了死递归
不要写成下面这个
