I'm not completely sure what are you intending and there is probably a more elegant solution to this (using POJOs rather than Collections and Jacksons JSON representation), but I guess this example will clear it out to you. But if you have some more complicated processing you might want to write custom (de)serializers or something like that. Written using Jackson 2.3.3
ObjectMapper mapper = new ObjectMapper();
JsonNode parsedJson = mapper.readTree(json); //parse the String or do what you already are doing to deserialize the JSON
ArrayNode outerArray = mapper.createArrayNode(); //your outer array
ObjectNode outerObject = mapper.createObjectNode(); //the object with the "data" array
outerObject.putPOJO("data",parsedJson);
outerArray.add(outerObject);
System.out.println(outerArray.toString()); //just to confirm everything is working