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]
檢查service層是否是自己調用了自己，形成了死遞歸
不要寫成下面這個
