Gson parse Json with array

Question

I am having some trouble building a class which will parse out gson as I expect it to.

I created a class.

public class JsonObjectBreakDown {
    public String type; 
    public List<String> coordinates = new ArrayList<String>();
}

And called

JsonObjectBreakDown p = gson.fromJson(withDup, JsonObjectBreakDown.class);

Below is my json

  {
   "type":"Polygon",
   "coordinates":[
      [
         [
            -66.9,
            18.05
         ],
         [
            -66.9,
            18.05
         ],
         [
            -66.9,
            18.06
         ],
         [
            -66.9,
            18.05
         ]
      ]
   ]
}

I have used gson before successfully, but never with an array like this. Should I not be using the List/ArrayList?

I get the error message;

Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 31

OpenCSV code

CSVReader reader = new CSVReader(new FileReader("c:\\Json.csv"));
String tmp = reader.readNext();
CustomObject tmpObj = CustomObject(tmp[0], tmp[1],......);

Here is an example thegeekyland.blogspot.com/2015/11/…

Arlind Hajredinaj
– Arlind Hajredinaj

2015-11-30 00:08:45 +00:00
Commented Nov 30, 2015 at 0:08 — Arlind Hajredinaj
– Arlind Hajredinaj, Commented Nov 30, 2015 at 0:08

Sotirios Delimanolis · Accepted Answer · 2013-09-18 18:59:47Z

4

The problem here is that you have an array of arrays of arrays of floating point numbers in your JSON. Your class should be

public class JsonObjectBreakDown {
    public String type; 
    public List<List<float[]>> coordinates = new ArrayList<>();
}

Parsing with the above and trying

System.out.println(p.coordinates.size());
System.out.println(p.coordinates.get(0).size());
System.out.println(Arrays.toString(p.coordinates.get(0).get(0)));

yields

1
2
[-66.9, 18.05]

answered Sep 18, 2013 at 18:59

Sotirios Delimanolis

281k62 gold badges718 silver badges744 bronze badges

Sign up to request clarification or add additional context in comments.

11 Comments

Sotirios Delimanolis Over a year ago

@user2524908 Yes, but if you are using Java 7, you don't need to put the argument in the constructor call. Just new ArrayList<>();

user2524908 Over a year ago

hm, I am getting 'Unterminated object at line 1 column 31.' I assume that means there is a problem with my json. I validated it correct format with some online json validator.

Sotirios Delimanolis Over a year ago

@user2524908 Can you edit your question with the actual json String you are using? I ran the code and it works.

user2524908 Over a year ago

I updated the json. Unfortunately it looks like my openvsc parser is stripping out one of the closing " after Polygon when I output it in eclipse

Sotirios Delimanolis Over a year ago

@user2524908 Before you go and fix how the CSV parsing happens, try to write the String out yourself with proper escaping and checking if that works for you.

|

Collectives™ on Stack Overflow

Gson parse Json with array

1 Answer 1

11 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

11 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related