Setting the Api Version with Swagger UI

Question

I have a REST API developed through the use of Jersey and we document the REST API through swagger-ui. Unfortunately, we did not start versioning the API from day 1. We are

Answer 1

API version displayed at the bottom of the Swagger UI is coming from the Swagger document.

Here is an example Swagger document:

{
    "swagger": "2.0",
    "info": {
        "description": "This is a sample server Petstore server.",
        "version": "1.0.0",
        "title": "Swagger Petstore",
    ...

"version": "1.0.0" is the default value but you can change it using the Swagger @Info annotation:

@SwaggerDefinition(
    info = @Info(
        description = "This is a sample server Petstore server.",
        version = "1.0.1",
        title = "Swagger Petstore"

This document can be added to any class scanned during the Swagger auto-configuration process as per the Swagger Wiki page:

The annotation can be on any class scanned during the Swagger auto-configuration process, i.e. it does not have to be on a JAX-RS API class but could just be on a marker/config interface

You can find some samples here: https://github.com/swagger-api/swagger-samples/tree/master/java. Some are using Jersey and setting the API version.