Spring Boot 集成接口管理工具 Knife4j

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

package com.cunyu.springbootknife4jdemo.config;
import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
@EnableKnife4j
public class Knife4jConfiguration {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .useDefaultResponseMessages(false)
                .apiInfo(apiInfo())
                .select()                .apis(RequestHandlerSelectors.basePackage("com.cunyu.springbootknife4jdemo.controller"))
                .paths(PathSelectors.any())
                .build();

    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .description("Kinfe4j 集成测试文档")
                .contact(new Contact())
                .version("v1.1.0")
                .title("API测试文档")
                .build();
    }
}

@Api(tags = "测试模块")
@RestController
public class DemoController {
    @ApiImplicitParam(name = "name", value = "姓名", required = true)
    @ApiOperation(value = "入门程序，Hello World")
    @PostMapping("/helloWorld")
    public ResponseEntity<String> helloWorld(@RequestParam(value = "name") String name) {
        return ResponseEntity.ok("Hello World，" + name);
    }
}

Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NullPointerException

@EnableWebMvc
@SpringBootApplication
public class SpringbootKnife4jDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootKnife4jDemoApplication.class, args);
    }
}

No mapping for GET /doc.html

@Configuration
public class WebMvcConfigurer extends WebMvcConfigurationSupport {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
        super.addResourceHandlers(registry);
    }
}