An API documentation dashboard is available at http://localhost:2222/swagger-ui.html after application startup. This is a more user-friendly version of the Swagger JSON definition file, which is also automatically generated and available at http://localhost:2222/v2/api-docs. That file can be imported by any other REST tools, for example, SoapUI:
If you prefer SoapUI instead of Swagger UI, you can easily import the Swagger definition file by selecting Project | Import Swagger. Then, you need to provide a file address, as you can see in this screenshot:
Personally, I prefer Swagger UI. You can expand every API method ...