springboot 配置 OpenFeign 时报错：Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; Connection refused: no further information

报错内容如下：

2022-11-18 01:55:18.998 ERROR 22220 --- [nio-8086-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is feign.RetryableException: Connection refused: no further information executing GET http://127.0.0.1:8082/robotGroup/group/list] with root cause

java.net.ConnectException: Connection refused: no further information
at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
。。。

我在测试时忘记把另一个服务端启动，因为非springcloud项目，所以一直以为配置问题，准备放弃睡觉时发现另一个服务端没启动，启动之后发现能成功。