Stack Overflow Asked by NoobCoder on January 19, 2021
Hello I am trying to read and parse a JSON file, when I attempt to read it I got exception of =org.json.JSONException: JSONArray[0] is not a JSONObject
. The JSON is shorten for sake of example. Provided will be my code,json and desired output.
Code:
public void Trial () throws JSONException {
String json = "[[{"appId": "MBSP","askPrice": 0,"bidPrice": 0,"collectionDataSource": "ExternalTick","collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0","collectionObservationTime": "2020-09-21T17:47:59.703Z","collectionType": "LIVE","coupon": 1.03,"createdBy": "Test","createdOn": "2020-09-21T17:47:59.703Z","createdOnDate": 0,"forward": 0,"issuingAgency": "FF","lastUpdated": "2020-09-21T17:47:59.703Z","lastUpdatedBy": "string","lastUpdatedDate": 0,"maturity": ,"midPrice":0 ,"mtaVersionNumber": 0,"settlementDate": "2020-09-21T17:47:59.703Z"}]]
";
JSONArray jsonObj = new JSONArray(json);
for (int i = 0; i < jsonObj.length(); i++) {
JSONObject jsonobject = jsonObj.getJSONObject(i);
String Coupon = jsonobject.getString("Coupon");
System.out.println(Coupon);
}
}
JSON:
[[
{
"appId": "MBSP",
"askPrice": 0,
"bidPrice": 0,
"collectionDataSource": "ExternalTick",
"collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",
"collectionObservationTime": "2020-09-21T17:47:59.703Z",
"collectionType": "LIVE",
"coupon": 1.03,
"createdBy": "Test",
"createdOn": "2020-09-21T17:47:59.703Z",
"createdOnDate": 0,
"forward": 0,
"issuingAgency": "FF",
"lastUpdated": "2020-09-21T17:47:59.703Z",
"lastUpdatedBy": "string",
"lastUpdatedDate": 0,
"maturity": ,
"midPrice":0 ,
"mtaVersionNumber": 0,
"settlementDate": "2020-09-21T17:47:59.703Z"
}
]]
Wanted ooutput
1.03
Any help would be appreciated.
The valid JSON should be :
[
{
"appId": "MBSP",
"askPrice": 0,
"bidPrice": 0,
"collectionDataSource": "ExternalTick",
"collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",
"collectionObservationTime": "2020-09-21T17:47:59.703Z",
"collectionType": "LIVE",
"coupon": 1.03,
"createdBy": "Test",
"createdOn": "2020-09-21T17:47:59.703Z",
"createdOnDate": 0,
"forward": 0,
"issuingAgency": "FF",
"lastUpdated": "2020-09-21T17:47:59.703Z",
"lastUpdatedBy": "string",
"lastUpdatedDate": 0,
"maturity": 0,
"midPrice":0 ,
"mtaVersionNumber": 0,
"settlementDate": "2020-09-21T17:47:59.703Z"
}
]
Update the code as well :
public class Sample {
public static void main(String[] args) {
String json = "[{n" +
" "appId": "MBSP",n" +
" "askPrice": 0,n" +
" "bidPrice": 0,n" +
" "collectionDataSource": "ExternalTick",n" +
" "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0",n" +
" "collectionObservationTime": "2020-09-21T17:47:59.703Z",n" +
" "collectionType": "LIVE",n" +
" "coupon": 1.03,n" +
" "createdBy": "Test",n" +
" "createdOn": "2020-09-21T17:47:59.703Z",n" +
" "createdOnDate": 0,n" +
" "forward": 0,n" +
" "issuingAgency": "FF",n" +
" "lastUpdated": "2020-09-21T17:47:59.703Z",n" +
" "lastUpdatedBy": "string",n" +
" "lastUpdatedDate": 0,n" +
" "maturity": 0,n" +
" "midPrice": 0,n" +
" "mtaVersionNumber": 0,n" +
" "settlementDate": "2020-09-21T17:47:59.703Z"n" +
"}]";
JSONArray jsonObj = new JSONArray(json);
for (int i = 0; i < jsonObj.length(); i++) {
JSONObject jsonobject = jsonObj.getJSONObject(i);
double Coupon = jsonobject.getDouble("coupon");
System.out.println(Coupon);
}
}
}
Output :
1.03
Correct answer by Anish B. on January 19, 2021
Your JSON input seems invalid:
"maturity": ,
maybe not valid json nodeString Coupon = jsonobject.getString("Coupon");
not correctSolution:
maturity
to a valid even value is empty/nullString coupon = jsonobject.getString("coupon");
Answered by Toàn Nguyễn Hải on January 19, 2021
if you check again your json you will notice there is array in array and then object. [ [ { } ] ]
Try this input, [ { } ]
[ { "appId": "MBSP", "askPrice": 0, "bidPrice": 0, "collectionDataSource": "ExternalTick", "collectionName": "FRM_MBS_TBA_FN_15Y_0.03_FWD0", "collectionObservationTime": "2020-09-21T17:47:59.703Z", "collectionType": "LIVE", "coupon": 1.03, "createdBy": "Test", "createdOn": "2020-09-21T17:47:59.703Z", "createdOnDate": 0, "forward": 0, "issuingAgency": "FF", "lastUpdated": "2020-09-21T17:47:59.703Z", "lastUpdatedBy": "string", "lastUpdatedDate": 0, "maturity": , "midPrice":0 , "mtaVersionNumber": 0, "settlementDate": "2020-09-21T17:47:59.703Z" } ]
Another way is handle in code to access json array inside a json array to get json object.
Thanks, I hope that helps you.
Answered by Nícolas Sims Botelho on January 19, 2021
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