How to use entity

I am trying to evaluate Roo to see if it can be a fit for my project. I just wanted to do a quick integration. Another word once I setup a simple entity with some simple column like name, address.... I need to make the call to the entity to to do some CRUD. But not from the MVC UI. I tried to instantiate the entity but there is were not setter to be had there. I been looking at some howto document and they seem to show that they can do setters, getters and the persist. Is the a current example of how to do this in the 1.2.2 roo implementation?

Thanks,