How to display "/oauth/token" endpoint on swagger-ui?

My project use spring cloud oauth to authenticate user with "/oauth/token" endpoint, but i can't find any way to display this api operation on swagger ui. What should I do?

Swagger Configuration:

@EnableSwagger2
@Configuration
public class SwaggerConfiguration {
    @Bean
    public Docket productApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("all").select()
            .apis(RequestHandlerSelectors.basePackage("com.demo.userservice.api.controller"))
            .paths(regex("/api.*"))
            .build()
            .apiInfo(metaInfo());
}



private ApiInfo metaInfo() {

    ApiInfo apiInfo = new ApiInfo(
            "Spring Boot Swagger USERSERVICE API",
            "Spring Boot Swagger USERSERVICE API",
            "1.0",
            "Terms of Service",
            new Contact("userservice", "",
                    ""),
            "Apache License Version 2.0",
            "https://www.apache.org/licesen.html", new ArrayList<VendorExtension>()
    );

    return apiInfo;
}


}

One solution is open all endpoint to show oauth/token endpoint this way

.apis(RequestHandlerSelectors.any())
.paths(PathSelectors.any()).build().pathMapping("/")

Or

If you want to show only desired path like /api/.* then you can modify the endpoint of oauth using this

@Configuration
@EnableAuthorizationServer
public class EndPointModificationConfig extends AuthorizationServerConfigurerAdapter {    

        @Override
        public void configure(AuthorizationServerEndpointsConfigurer endpoints) {
            endpoints
                .pathMapping("/oauth/token", "/api/oauth/token");
        }
}

And use this for get all api

.apis(RequestHandlerSelectors.any())