Apache Isis™ is a framework to let you rapidly develop domain-driven apps in Java. This app has been generated using Isis' TodoApp archetype, which configures Isis to run a (quite feature rich) "todo" app.
The app itself consists of a single domain class, ToDoItem, along with a number of supporting services.
To access the app:
provides access to a RESTful API conformant with the Restful Objects spec. This is part of Isis Core. The implementation technology is JBoss RestEasy.
The default user/password is todoapp-admin/pass, as configured in an initial seed file.
To build your own app, while you could start with this todo app and remove/rename as required, you are probably better off using the extremely minimal SimpleApp archetype. Use this app as reference for configuring additional modules.