问题背景

项目升级了SpringBoot 2.2.7之后，项目中少数遗留的前后端未分离的界面出现问题

完整报错信息

Circular view path would dispatch back to the current handler…This may be the result of an unspecified view, due to default view name generation

解决办法

添加配置

spring.freemarker.suffix=.ftl