if you are using spring boot V3.4.0, JDK17 version and above, update the below dependency version from 2.5.0 to 2.7.0, which is working my case

<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
<version>2.7.0</version>