exemple

// run the project
url/v2/api-docs

// swagger ui (don't forget slash at the end)
url/swagger-ui/

pom.xml

<!-- https://mvnrepository.com/artifact/io.springfox/springfox-boot-starter -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-boot-starter</artifactId>
            <version>3.0.0</version>
        </dependency>

SwaggerConfig.java

package com.ecomflutter.demo.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;

@Configuration
public class SwaggerConfig {

    @Bean
    public Docket apiDocket(){
        Docket docket=new Docket(DocumentationType.SWAGGER_2)
                //select all routes on
                .select()
                // on this package
                .apis(RequestHandlerSelectors.basePackage("com.ecomflutter.demo"))
                .build();

        return docket;
    }
}