[SpringFox Error] Unable to infer base url

Background

I want to use Swagger with Spring Boot, but the Swagger-UI can’t work. Following it’s my code.

pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.6.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>2.9.2</version>
    </dependency>
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>2.9.2</version>
    </dependency>
</dependencies>

AppConfig.java

@Configuration
@EnableSwagger2
public class SpringFoxConfig
{
    @Bean
    public Docket api()
    {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.any())
                .paths(PathSelectors.any())
                .build();
    }
}

Error Info

When I visited http://localhost:8080/swagger-ui.html, occur following error tips.

Solution

make sure your swagger configuration is under your spring boot application which can be scanned.
and then it solved.

Reason

My config file doesn’t scan by spring boot. It leads to the required bean is not exist.

References

https://github.com/springfox/springfox/issues/1996