Thinking a bit more about this (read trying out some stuff). The way we want to change the
API is right now is ‘just’ the message format, how about we take a servlet filter that
changes the json from the old version to the new?
There is a lib  that takes a json and transforms it into another json.
Other option is to have 2 jax-rs classes, but to make that work they will have to have 2
different paths. So you would have to ‘redirect’ / change the path in the servlet filter
based on the accept header. Which feels like kinda of a hack to me.
So WDYT any other suggestions?