{
"person":{"first_name":"John", "last_name":"Smith"},
"pets":[{"species":"dog", "name":"Adama"}, {"species":"cat", "name":"Benton"} ],
"toys":[{"car":"corvet", "color":"black"}, {"action_figure":"hancock", "height":"1ft"} ]
}

@Post
public Representation readForm(Representation representation) {
    try {
        Person aPerson = …
        Set<Pet>  petSet = …
        Set<Toy> toySet = ...

      ….