Parsing a JSON array BEGIN_ARRAY but was NAME

Question

I'm parsing this JSON stream

{
    "status":"ok",
    "count":1,
    "data":{
        "1000194290":[
            {
                "statistics":{
                    "wins":472,
                    "all":{
                        "spotted":0,
                        "hits":0,
                        "battle_avg_xp":0,
                        "draws":0,
                        "wins":472,
                        "losses":0,
                        "capture_points":0,
                        "battles":894,
                        "damage_dealt":0,
                        "hits_percents":0,
                        "damage_received":0,
                        "shots":0,
                        "xp":0,
                        "frags":0,
                        "survived_battles":0,
                        "dropped_capture_points":0
                    },
                    "battles":894
                },
                "mark_of_mastery":4,
                "tank_id":3649
            },
            ...
        ]
    }
}

I attempt to start an array at 1000194290 but get this error

Exception in thread "main" java.lang.IllegalStateException: Expected BEGIN_ARRAY but was NAME at line 1 column 35

My parsing class looks like this

public List<TankStats> readJsonStream(InputStream in) throws IOException {
    try (JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"))) {
        return readTankIdStep(reader);
    }
}

public List<TankStats> readTankIdStep(JsonReader reader) throws IOException {
    List<TankStats> users = new ArrayList<>();
    reader.beginObject();
    while (reader.hasNext()) {
        String name = reader.nextName();
        if (name.equals("data")) {
            reader.beginObject();
            while (reader.hasNext()) {
                reader.beginArray();
                while (reader.hasNext()) {
                    users.add(readTankId(reader));
                 }
                 reader.endArray();
            }
        }   
        else {
            reader.skipValue();
        }   
    }
    reader.endObject();
    return users;
}

I'm not really sure how to get around this error.

Where is your error? Can you post the stack trace and tell us which line is the error? — Joffrey
– Joffrey, Commented Apr 28, 2014 at 14:09

Sotirios Delimanolis · Accepted Answer · 2014-04-28 14:13:57Z

4

You check for the JSON

"data":{

with

if (name.equals("data")) {

Then consume the object in that name value pair with

reader.beginObject();

But then you do this

while (reader.hasNext()) {
    reader.beginArray();

while the token in the reader is

"1000194290":[
        {

You have to first consume the name before you consume the array.

answered Apr 28, 2014 at 14:13

Sotirios Delimanolis

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3 Comments

njzk2 Over a year ago

to be more specific, reader.nextName(); will return "1000194290" at this point.

user3581606 Over a year ago

adding reader.nextName(); beforereader.beginArray(); fixed it thanks

Sotirios Delimanolis Over a year ago

@user3581606 You're welcome. If the answer fixes your issue, you should accept it (click the check mark next to the appropriate answer). That does two things. It lets everyone know your issue has been resolved, and it gives the person that helps you credit for the assist.

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