Caused by: java.lang.ClassNotFoundException: springfox.documentation.common.ClassPresentInClassPathC

因为swagger版本与knife4j不兼容

<dependency>             <groupId>com.github.xiaoymin</groupId>             <artifactId>knife4j-spring-boot-starter</artifactId>             <version>3.0.3</version>         </dependency> 

3.0.3版本太高可以降成2.0.4或2.0.9都行

<dependency>             <groupId>com.github.xiaoymin</groupId>             <artifactId>knife4j-spring-boot-starter</artifactId>             <version>2.0.4</version>         </dependency>