Vfrdtyky

I need the following XML structure converted to json using JSON.org library
I am able to achieve a json structure but need the root node to be truncated and represent the CHallan details node to be always represented as an array even if it has a single element.

Source XML

        <?xml version="1.0" encoding="UTF-8"?>

      <ns0:MT_CPINPushRequest xmlns:ns0="http://apcfss.com/CFMS/RCP-FM-          I071/CPINPushRequest">

    <System>GOAP</System>

    <ServiceType>CPINPUSHREQ</ServiceType>

    <Signature>ZJLASDFASDFAS</Signature>

    <Payload>

      <CPIN>10341234567890</CPIN>

      <ExpDt>20170720</ExpDt>

      <TotalAmt>200</TotalAmt>

      <PayerName>abc</PayerName>

      <ChallanDtls>

         <AcntID>101001001</AcntID>

         <Amount>200</Amount>

         <AdminZone>10</AdminZone>

      </ChallanDtls>

    <ChallanDtls>

         <AcntID>101001001</AcntID>

         <Amount>200</Amount>

         <AdminZone>10</AdminZone> 

        </ChallanDtls>

       </Payload>

     </ns0:MT_CPINPushRequest>

Required JSON Response

  {             

 "System":"GOBH",   

   "ServiceType":"CPINPUSHREQ",

          “Signature”:”ZJLASDFASDFAS”  ,                  

          “Payload” :

  {                 

              "CPIN":"10341234567890",

              "ExpDt":"20170720",

              "TotalAmt":"200.00",

    “PayerName”:”abc”,

              "ChallanDtls":

       [              

           {

            "AcntID":"101001001",

            "Amount":"200.00",

            "AdminZone":"10"

            },



        ]

       } 

   }

CODE

 import java.io.InputStream;

    import java.io.OutputStream;





     import org.json.JSONObject;

      import org.json.XML;





       import com.sap.aii.mapping.api.AbstractTransformation;

     import com.sap.aii.mapping.api.StreamTransformationException;

import com.sap.aii.mapping.api.TransformationInput;

import com.sap.aii.mapping.api.TransformationOutput;





public class XMLToJSONConversion extends AbstractTransformation {





  @Override

  public void transform(TransformationInput transformationInput, TransformationOutput transformationOutput)

  throws StreamTransformationException {

  InputStream inputStream = transformationInput.getInputPayload().getInputStream();

  OutputStream outputStream = transformationOutput.getOutputPayload().getOutputStream();

  try {

  byte buf = new byte[inputStream.available()];

  inputStream.read(buf);

  JSONObject xmlJsonObj = XML.toJSONObject(new String(buf, "utf-8"));

  String jsonPrettyPrintString = xmlJsonObj.toString(4);

  byte bytes = jsonPrettyPrintString.toString().getBytes("UTF-8");

  outputStream.write(bytes);

  } catch (Exception e) {

  getTrace().addDebugMessage("Exception while writing OutputPayload: IOException", e);

  throw new StreamTransformationException(e.toString());

  }

  }

}

Please suggest