Naked Objects will automatically inject any domain services into your domain objects, but to do this must know about then when they are instantiated. But it also requires to know about them so that it can track their persistence state. To do this, use the DomainObjectContainer#newTransientInstance(Class) method. Note that this also requires that your domain object has a public no-arg constructor.

Similarly, if you want to persist a domain object, use DomainObjectContainer#persist().

If inheriting from AbstractDomainObject, then there are helper methods that delegate to the container for you.