To compile and run the example execute:

cd initial
mvn package && java -jar target/gs-spring-boot-0.1.0.jar

To access to the Swagger-UI go to http://localhost:8080/swagger-ui.html

To access to the swagger-json file go to http://localhost:8080/v2/api-docs here if you find for the text: "ref" (literal with double quotes included) you will see that the parameter object is of type: "ref".