404 when use swagger2-ui with spring-boot

Question

I'm trying to make documentation on the code I'm working with using Spring-boot , swagger2 and H2-database.

Here is the swaggerconfig

@Configuration
@EnableSwagger2
public class SwaggerConfig extends WebMvcConfigurationSupport {

    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2).select()
                .apis(RequestHandlerSelectors
                        .basePackage("se.dala.restserviceswagger.controller"))
                .paths(PathSelectors.any())
                .build();
    }
}

And here is the Controller

@RestController
public class EmployeeController {

    private final EmployeeRepository repository;
    private final EmployeeResourceAssembler assembler;

    public EmployeeController(EmployeeRepository repository, EmployeeResourceAssembler assembler) {
        this.repository = repository;
        this.assembler = assembler;
    }

    @GetMapping("/employees/{id}")
    public Resource<Employee> get(@PathVariable Long id) {
        Employee employee = repository.findById(id).orElseThrow(() -> new EmployeeNotFoundException(id));

        return assembler.toResource(employee);
    }

    @GetMapping("/employees")
    public Resources<Resource<Employee>> getAll() {
        List<Resource<Employee>> employees = repository.findAll().stream()
                .map(assembler::toResource)
                .collect(Collectors.toList());

        return new Resources<>(employees,
                linkTo(methodOn(EmployeeController.class).getAll()).withSelfRel());
    }

    //Blanda inte ihop resource.getId() med employee.getId(). resource.getId() ger dig en URI.
    @PostMapping("/employees")
    public ResponseEntity<?> newEmployee(@RequestBody Employee newEmployee) throws URISyntaxException {
        Resource<Employee> resource = assembler.toResource(repository.save(newEmployee));

        return ResponseEntity.created(new URI(resource.getId().expand().getHref())).body(resource);
    }

    @PutMapping("/employees/{id}")
    public ResponseEntity<?> replace(@RequestBody Employee newEmployee, @PathVariable Long id) throws URISyntaxException {
        Employee updatedEmployee =  repository.findById(id).map(employee -> {
            employee.setName(newEmployee.getName());
            employee.setRole(newEmployee.getRole());
            return repository.save(employee);
        }).orElseGet(() -> {
            newEmployee.setId(id);
            return repository.save(newEmployee);
        });

        Resource<Employee> resource = assembler.toResource(updatedEmployee);

        return ResponseEntity.created(new URI(resource.getId().expand().getHref())).body(resource);
    }

    @DeleteMapping("/employees/{id}")
    public ResponseEntity<?> delete(@PathVariable Long id) {
        repository.deleteById(id);

        return ResponseEntity.noContent().build();
    }
}

And here is my pom.

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-hateoas</artifactId>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.6.1</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.6.1</version>
            <scope>compile</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

When I go to http://localhost:8080/v2/api-docs I get it to work but not when I go to http://localhost:8080/swagger-ui.html. There I get: Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Thu Feb 14 15:22:38 CET 2019 There was an unexpected error (type=Not Found, status=404). No message available

I don't have any Spring security or anything.

Answer 1

Use SwaggerConfig without extending WebMvcConfigurationSupport should work then.

Error is not related to security its telling that there is no mapped path with that url.

@Configuration
@EnableSwagger2
public class SwaggerConfig {

 @Bean
 public Docket api() {
    return new Docket(DocumentationType.SWAGGER_2).select()
            .apis(RequestHandlerSelectors
                    .basePackage("se.dala.restserviceswagger.controller"))
            .paths(PathSelectors.any())
            .build();
 }
}

Answer 2

Same for me becareful with Spring boot it will work until version 2.8.0 it does'nt work with version 3.0.0

tested with this

@Configuration
@EnableSwagger2
public class SwaggerConfig{

@Value("${application.version}")
private String version;

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

/**
 * will add some importants information to the swagger docs
 * @return
 */
private ApiInfo apiInfo() {
    return new ApiInfo("Langton ant app", "rest api for langton ant app", version, null,
            new Contact("name", "N/A", "email"), null, null, Collections.EMPTY_LIST);
}

}

and in main class

@SpringBootApplication
public class LangtonAntLauncher{


public static void main(String[] args) {
    SpringApplication.run(LangtonAntLauncher.class, args);
}

}