ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject

Question

I am trying to parse a son file, and I don't know what I'm doing wrong (of course, I don't really know what I'm doing right, either).

file.json

[{  
"arrOne":{  
    "one":"a",
    "two":"b",
    "three":"c",
    "four":"d",
    "five":"e"
},
"elemTwo":"f",
"elemThree":"g",
"elemFour":"h",
"elemFive":"i",
"arrSix":[{  
    "six":1,
    "seven":2,
    "eight":"j"
}]}]

code:

import java.io.FileNotFoundException;
import java.io.FileReader;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
//...........
JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/path/to/file.json"));
JSONObject json = (JSONObject) obj;
String unit = (String) json.get("elemTwo");
System.out.println(unit);

I get the error ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject. Truthfully, I have no idea what I'm doing. Any help would be great! Thanks!

You've got a JSON array in your data (it's wrapped in []). So, if you parse it, its type is JSONArray, not JSONObject - exactly what the exception says. — Andy Turner
– Andy Turner, Commented Jan 29, 2016 at 22:01

rj27 · Accepted Answer · 2017-06-02 09:22:49Z

4

You should cast your obj toJsonArrayinstead of JsonObject, because your json file has [] at the root.

edited Jun 2, 2017 at 9:22

rj27

871 silver badge9 bronze badges

answered Jan 29, 2016 at 22:03

adushenin

2691 silver badge3 bronze badges

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

Comments

Sushant Gosavi · Accepted Answer · 2017-03-02 09:32:28Z

2

you are getting JSONArray not JsonObject

JSONParser parser = new JSONParser();
Object obj = parser.parse(new FileReader("/path/to/file.json"));
JSONArray json = (JSONArray) obj;

Than loop this and get jsonobject

edited Mar 2, 2017 at 9:32

answered Mar 1, 2017 at 13:20

Sushant Gosavi

3,8553 gold badges38 silver badges58 bronze badges

Comments

Abdelhak · Accepted Answer · 2016-01-29 22:24:02Z

0

When the JSonParser parses the file, it's returning it as a JSONArray, to solve it try to use this:

    JSONObject obj = (JSONObject)obj;
    JSONObject elem = (JSONObject)obj.get("0");
    String unit = (String) elem.get("elemTwo");
    System.out.println(unit);

answered Jan 29, 2016 at 22:24

Abdelhak

8,4154 gold badges25 silver badges37 bronze badges

Collectives™ on Stack Overflow

ClassCastException: org.json.simple.JSONArray cannot be cast to org.json.simple.JSONObject

3 Answers 3

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related