Swagger-ui: No operations defined in spec

Hi,

I’ve been having issues setting up the swagger UI. I’ve getting ‘No operations defined in spec’ even though Swagger API at localhost:8080/v2/api-docs returns what looks like a valid output

My build.gradle contains this:

    compile 'io.springfox:springfox-swagger2:2.8.0'
    compile 'io.springfox:springfox-swagger-ui:2.8.0'

App is written in Kotlin, this is the main entry class

@SpringBootApplication
@EnableAutoConfiguration(exclude = [(JacksonAutoConfiguration::class)])
class Application

fun main(args: Array<String>) {
    SpringApplicationBuilder()
            .sources(Application::class.java)
            .run(*args)
}

And Swagger config

@Configuration
@EnableSwagger2
class SwaggerConfig {
    @Bean
    fun api(): Docket {
        return Docket(DocumentationType.SWAGGER_2)
                .apiInfo(ApiInfoBuilder()
                        .title("Spring Boot project")
                        .description("Spring Boot bootstrap project")
                        .version("0.1")
                        .license("Unlicense")
                        .build())
                .select()
                .apis(RequestHandlerSelectors.any())
                .paths(PathSelectors.any())
                .build()
    }
}

Any help would be appreciated as my Googlefoo has failed me here

[mgumiero9]

Just check if your basePackage is configured properly.

`@Bean public Docket greetingApi() { return new Docket(DocumentationType.SWAGGER_2) .select() .apis(RequestHandlerSelectors.basePackage(“application.controller”)) .build() .apiInfo(metaData());

}`

[TopHatCroat]

Sigh… The problem was actually that I used GSON, which wrapped the entire JSON response from Swagger API into {value: “<actual Swagger content>”} object. The problem was hiding in plain sight, as is often in life…

Anyway, for anyone wondering how to fix this, add a new configuration bean like so

@Configuration
class GsonHttpMessageConverterConfig {

    @Bean
    fun gsonHttpMessageConverter() = GsonHttpMessageConverter().apply { gson = gson() }

    private fun gson() = GsonBuilder()
            .registerTypeAdapter(Json::class.java, JsonSerializer<Json> { src, _, _ ->
                JsonParser().parse(src.value())
            }).create()

}

In hindsight, maybe Swagger should report a bit clearer message like “No data found” when nothing recognizable to it exists in the docs response, but that’s an issue for another repo