Top level list in discovery document are not generated correctly

[ircecho]

In our discovery document we have lists as method return types like this:

"schemas": {
    "ListOfOrder": {
        "id": "ListOfOrder",
        "type": "array",
        "items": {
            "$ref": "Order"
        }
    },
    "...": "...",
}

"methods": {
    "list": {
        "...": "...",
        "response": {
            "$ref": "ListOfOrder"
        }
    }
}

The java client generator will happily use the type ListOfOrder like a class in many places, but will not generate the class itself, thereby yielding code, which will not even compile.