Parse JSON data

Hello there,

How get the response from the server with a list of objects. Now I want to know how can I get some part of the data on my client side. My JSON looks like this

{"productId":{
"isImported":false, "routeOfAdminId":null, "manufacturerId":null, "shelfDate":null, "dosagePackageTypeId":null, "genericname":null, "packageQty":null, "brandName":"Coar", "updatedBy":null, "id":5, "created":1385270765983, 
"productPackage":{"widthunit":null, "depthunit":null, "weight":null, "heightunit":null, "packageTypeByPackagingunit":null, "weightunit":null, "width":null, "qty":null, "depth":null, "id":5, "packageTypeByQtyunit":null, "height":null, "packaging":null}, 
"supplierId":{"phone":null, "fax":null, "suppliersince":null, "status":false, "perName":"Ba Per", "lastUpdated":1384580197033, "web":null, "postcode":null, "companycode":null, "section":{"id":1, "createdBy":1, "created":1369838095000, "name":"Medical", "lastUpdated":null, "code":1, "alternateName":"a", "updatedBy":1}, "updatedBy":1, "personincharge":null, "city":{"id":311, "telcode":21, "cityname":"?????", 
"district":{"id":531, "districtname":"?????", "countyId":{"id":113, "countyname":"?????", "province":{"id":8, "provincename":"?????", "code":10, "capital":"?????"}}}, "taxcode":1001000}, "id":1, "companyid":null, "createdBy":1, "address":"dsfadfadf", "created":1384579329223, "email":null, 
"contractId":{"id":1, "contractTo":1416116154000, 
"contractTp":{"id":1, "engname":"Credit", "pername":"Credit Per", 
"contractSs":[null,{"id":4, "contractTo":1417333515000, "contractTp":null, "contractNo":77, "contractFrom":1385797515000},{"id":3, "contractTo":1416633147000, "contractTp":null, "contractNo":122, "contractFrom":1385097146000}]}, "contractNo":1222, "contractFrom":1384580154000}, "supplierid":1, "printName":null, "engName":"Ba"}, "status":null, "productCode":5, "dosage":null, "barcode":null, "lastUpdated":null, "printname":null, "dosageFormId":null, "packageQtyPackageTypeId":null, 
"sectionId":{"id":1, "createdBy":1, "created":1369838095000, "name":"Medical", "lastUpdated":null, "code":1, "alternateName":"a", "updatedBy":1}, "createdBy":1, "irc":null, "fdocode":null, "productCategoryId":null, "storage":null}, "id":9, "purchasePrice":8000, "_selection_35":true, "orderQty":7500}

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now I when I do this(see below code) I get result of some values but some are retuning null( the LISTGRID RECORD  2   and LISTGRID RECORD  3 are NULL). what am I doing wrong

Record getQty = orderGrid.getEditedRecord(i);
JavaScriptObject jsObj = getQty.getJsObj();
			
JSONObject o = new JSONObject(jsObj);
			
System.out.println("LISTGRID RECORD   1  "+o.toString());
			
System.out.println("LISTGRID RECORD  2   "+o.get("section"));           //RETURNING NULL
			
System.out.println("LISTGRID RECORD   3  "+o.get("supplierId"));      //RETURNING NULL
			
System.out.println("LISTGRID RECORD   4  "+o.get("productId"));       
			
System.out.println("PRODUCT QTY    "+o.get("id")+"  PRODUCT QTY    "+o.get("orderQty"));  // PRODUCT QTY    9  PRODUCT QTY    7500

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