Springboot项目报错Circular view path [index]: would dispatch back to the current handler URL

报错：
Circular view path [index]: would dispatch back to the current handler URL [/index] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)
原因：
项目中没有导入 spring-boot-starter-thymeleaf的依赖
解决办法：
pom.xml中导入

 
     org.springframework.boot
    spring-boot-starter-thymeleaf