java json error on casting

Question

My Java code look like below:

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
String jsonMember = strUrl;
String strMember = readUrl(jsonMember);

if (!Validator.isEmpty(strMember)) {
    Object obj = parser.parse(strMember);
    JSONObject jo = (JSONObject) obj;
    JSONArray jsonArrayMember = (JSONArray) jo.get("member");
    for (int j = 0; j < jsonArrayMember.size(); j++) {
        JSONObject memberObj = (JSONObject) jsonArrayMember.get(j);
        String name = memberObj.get("name").toString();
        String age = memberObj.get("age").toString();
    }
}

the strUrl look like below:

{
    "team": {
        "team_id": "2",
        "team_name": "volcanoe"
    },
    "member": [
        {
            "name": "Samantha",
            "age": "20"
        }
    ]
}

it gives me error as below:

java.lang.ClassCastException: java.lang.Boolean cannot be cast to org.json.simple.JSONArray

for line:

JSONArray jsonArrayMember = (JSONArray) jo.get("member");

i was trying to read the member element of the json, but strangely get the boolean error. None of the json are using boolean, they are json object.

extra info: the code work fine on development server, but when put to production, it caused above error. Is there anything to do with the code or the library/jdk imported?

any help would be great.

I don't have any exception with the json string. I think your problem is string itself, check the real input string first. — tommybee
– tommybee, Commented May 21, 2018 at 7:53

Gokul raj · Accepted Answer · 2018-05-21 06:49:50Z

1

hope this will help you

String jsonString="{\"team\": {\"team_id\": \"2\",\"team_name\": \"volcanoe\"},\"member\": [{\"name\": \"Samantha\",\"age\": \"20\"}]}";

JSONObject jsonObject = new JSONObject(jsonString);

JSONArray jsonArrayMember=jsonObject.getJSONArray("member");

System.out.println(jsonArrayMember);

can you please change your org.json jar file to the one in this link org.json and try again hope this will solve your problem

edited May 21, 2018 at 6:49

answered May 21, 2018 at 6:44

Gokul raj

535 bronze badges

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

4 Comments

Teddybugs Over a year ago

what version of java jdk that org.json works, because i try to run it i get: Cannot find symbol symbol: method getJSONArray(String) location: variable jsonObject of type JSONObject

Gokul raj Over a year ago

am using jdk 1.8. So, try jdk 1.8 and later versions

Teddybugs Over a year ago

we are using the same jdk version.. still get that error, do you have any idea? thanks for helping..

Teddybugs Over a year ago

nvm solved.. --> import org.json.JSONArray; thanks alot

Panupong Kongarn · Accepted Answer · 2018-05-21 06:35:25Z

0

As "team" is a json object {}, "member" is a json array [],

You should try this

JSONArray jsonArrayMember = jo.getJSONArray("member");

answered May 21, 2018 at 6:35

Panupong Kongarn

1,9093 gold badges23 silver badges46 bronze badges

Collectives™ on Stack Overflow

java json error on casting

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related