Providing a getter at least is sometimes practically unavoidable, so there's 1 repetition, but with a good IDE that's just a quick key combination over the variable name.
I'm curious, could you please elaborate on this point? If a class has any dependency, i usually find it better to require that dependency to be passed in the constructor, so the constructed instance can always be in a valid initialized state. Why do you find nullary constructors to be good OO?
About the nullary constructor + init() method for deserializing purposes, i don't have any strong opinion really, as long as consistency is kept throughout the code base/module that relies on that. Using Java's reflection API though, you can extract all necessary type information from non-nullary constructors in order to call them with the required dependencies, which is not essentially more complicated than instantiating the class and then setting its properties thought setter methods.
Is there a preferred way on HN to address a "duplicate" reply?