Springfox swagger-ui.html not loading

Question

Im trying to acces the swagger ui page, but when i'm gonna acces the page, this error comes up

This application has no explicit mapping for /error, so you are seeing this as a fallback

My project tree:

The swagger Config class

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    @Bean
    public Docket productApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.aluno"))
                .paths(regex("/api.*"))
                .build()
                .apiInfo(metaInfo());
    }

    private ApiInfo metaInfo() {

        ApiInfo apiInfo = new ApiInfo(
                "Cursos API REST",
                "API REST de registro de alunos.",
                "1.0",
                "Terms of Service",
                new Contact("Romulo Sorato", "https://www.linkedin.com/in/r%C3%B4mulo-sorato-domingos-a6524437/",
                        "romulosorato@hotmail.com"),
                "Apache License Version 2.0",
                "https://www.apache.org/licesen.html", new ArrayList<>()
        );

        return apiInfo;
    }
}

My pom.xml

  <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger2</artifactId>
        <version>3.0.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger-ui -->
    <dependency>
        <groupId>io.springfox</groupId>
        <artifactId>springfox-swagger-ui</artifactId>
        <version>3.0.0</version>
    </dependency>
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>2.0.1.Final</version>
    </dependency>

Why i cant acces the swagger-ui?

Looks like even tomcat is launching. I added the correct depencies on pom.xml

Answer 1

Looks like you want to use Springfox3. If yes, then try the following changes.

Remove springfox-swagger2 and springfox-swagger-ui and add below dependency in pom.xml

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-boot-starter</artifactId>
            <version>3.0.0</version>
        </dependency>

SwaggerConfig - remove @EnableSwagger2 annotation

@Configuration
public class SwaggerConfig {

    @Bean
    public Docket productApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.aluno"))
                .paths(PathSelectors.any())
                .build()
                .apiInfo(metaInfo());
    }

    private ApiInfo metaInfo() {

        ApiInfo apiInfo = new ApiInfo(
                "Cursos API REST",
                "API REST de registro de alunos.",
                "1.0",
                "Terms of Service",
                new Contact("Romulo Sorato", "https://www.linkedin.com/in/r%C3%B4mulo-sorato-domingos-a6524437/",
                        "romulosorato@hotmail.com"),
                "Apache License Version 2.0",
                "https://www.apache.org/licesen.html", new ArrayList<>()
        );

        return apiInfo;
    }
}

For this version, URL of UI has been changed as shown below:

http://localhost:8080/swagger-ui/index.html

If you want to use older version then just use version 2.9.2 (works perfectly fine for me). No other changes required in your config file or UI's URL.

        <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>

Answer 2

could you please try this, it works for me

@Bean
    public Docket productApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()                                       
                  .apis(RequestHandlerSelectors.basePackage("com.aluno.controller"))
                  .paths(PathSelectors.any())                   
                  .build();
    }

could you please check, these dependencies are added

<dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.7.0</version>
        </dependency>