swagger-codegen

TLDR

Generate documentation and code from an OpenAPI/swagger file

$ swagger-codegen generate -i [swagger_file] -l [language]

Generate Java code using the library retrofit2 and the option useRxJava2

$ swagger-codegen generate -i [http://petstore.swagger.io/v2/swagger.json] -l [java] --library [retrofit2] -D[useRxJava2]=[true]

List available languages

$ swagger-codegen langs

Display help for a specific command

$ swagger-codegen [generate|config-help|meta|langs|version] --help