spring - Why is Swagger's api-docs response wrapped in additional JSON Object? -

i added swagger spring boot application including dependency:

<dependency>   <groupid>io.springfox</groupid>   <artifactid>springfox-swagger2</artifactid>   <version>2.3.1</version> </dependency> 

and adding config class:

@configuration @enableswagger2 public class swaggerconfig {      @bean     public docket api(){         return new docket(documentationtype.swagger_2)             .select()             .apis(requesthandlerselectors.any())             .paths(predicates.or(pathselectors.regex("...")))             .build()             .apiinfo(apiinfo());     }      private apiinfo apiinfo() {         return new apiinfo(...);     } } 

i can access /v2/api-docs , json seems describe api. however, json wrapped in json object (abbreviated): {"value":"{\"swagger\":\"2.0\",\"info\":...}

the {"value": "..."} object isn't needed , causes errors in swagger-ui. petstore example doesn't has level. this bug? or config issue?

ps: created github issue that

the guys on @ https://github.com/springfox/springfox/issues/1156 pointed me in right direction. problem follows:

i'm using gson instead of jackson de-/serialise json. when object of type springfox.documentation.spring.web.json.json gets serialised, included annotation considered jackson ignored gson.