springboot集成knife4j的时候3.0.2版本出现了以下问题：
An attempt was made to call a method that does not exist. The attempt was made from the following location:
springfox.documentation.schema.plugins.SchemaPluginsManager.viewProvider(SchemaPluginsManager.java:95)
The following method did not exist:
org.springframework.plugin.core.PluginRegistry.getPluginFor(Ljava/lang/Object;)Ljava/util/Optional;
The method's class, org.springframework.plugin.core.PluginRegistry, is available from the following locations:
jar:file:/Users/zhangyanping/Documents/software/maven/maven_repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/spring-plugin-core-1.2.0.RELEASE.jar!/org/springframework/plugin/core/PluginRegistry.class
It was loaded from the following location:
file:/Users/zhangyanping/Documents/software/maven/maven_repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/spring-plugin-core-1.2.0.RELEASE.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.springframework.plugin.core.PluginRegistry
我自己的依赖如下：
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>knife4j-spring-boot-starter</artifactId>
<version>3.0.2</version>
</dependency>
解决办法：将依赖中的spring-plugin-core去除，并添加高版本。解决之后依赖如下：
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>knife4j-spring-boot-starter</artifactId>
<version>3.0.2</version>
<exclusions>
<exclusion>
<groupId>org.springframework.plugin</groupId>
<artifactId>spring-plugin-core</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependency>
<groupId>org.springframework.plugin</groupId>
<artifactId>spring-plugin-core</artifactId>
<version>2.0.0.RELEASE</version>
</dependency>
至此，问题就解决了
