DataFrame to read json and include raw Json in DataFrame

[Richard Xin]

Say I have following data in file:{"id":1234,"ln":"Doe","fn":"John","age":25}
{"id":1235,"ln":"Doe","fn":"Jane","age":22}
java code snippet:        final SparkConf sparkConf = new 
SparkConf().setMaster("local[2]").setAppName("json_test");
        JavaSparkContext ctx = new JavaSparkContext(sparkConf);
        HiveContext hc = new HiveContext(ctx.sc());
        DataFrame df = hc.read().json("files/json/example2.json");

what I need is a DataFrame with columns id, ln, fn, age as well as raw_json 
string
any advice on the best practice in java?Thanks,
Richard