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

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>