facing nullpointerexception while consuming kSOAP2 web service

[Anil Deshpande]

Hi,

I have implimented a SOAP web service using Axis. The web service adds two numbers and returns the sum. The code looks like this.

public class ServiceAdd {

	public double returnSum(String num1,String num2)
	{
		System.out.println("You are hitting the web service");
		return Double.parseDouble(num1)+Double.parseDouble(num2);
	}
}

And I have published the web service and its working fine. If I execute it through Axis framework it's working perfectly fine.
And now I am tring to access the web service through Android Activity

This is the utility interface which contains the constants.

public interface UtilityInterface {

	String WEBSERVICE_URL="http://10.122.133.120:13247/SimpleWebService/services/ServiceAdd?wsdl";
	String NAME_SPACE="http://getsum.com";
	String METHOD_NAME="returnSum";
	String SOAP_ACTION=NAME_SPACE+"/"+METHOD_NAME;
	
}

And this is the activity code.

Log.i("web"," "+i++);
		SoapObject soapObject=new SoapObject(UtilityInterface.NAME_SPACE,UtilityInterface.METHOD_NAME);
		Log.i("web"," "+i++);
		soapObject.addProperty("num1",num1.getText().toString() );
		Log.i("web"," "+i++);
		soapObject.addProperty("num2", num2.getText().toString());
		Log.i("web"," "+i++);
		
		SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
		Log.i("web"," "+i++);
    	envelope.dotNet = true;
    	Log.i("web"," "+i++);
    	envelope.setOutputSoapObject(soapObject);
    	Log.i("web"," "+i++);
    	AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport(UtilityInterface.WEBSERVICE_URL);
    	try {
    		Log.i("web"," "+i++);
			androidHttpTransport.call(UtilityInterface.SOAP_ACTION,envelope);
			Log.i("web"," "+i++);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (XmlPullParserException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	
    	
    	
		SoapSerializationEnvelope serializationEnvelope=new SoapSerializationEnvelope(SoapEnvelope.VER11);
		//serializationEnvelope.dotNet=true;
		serializationEnvelope.setOutputSoapObject(soapObject);
		KvmSerializable result=(KvmSerializable)serializationEnvelope.bodyIn;
		Log.i("web", ""+result.getPropertyCount());

The last line in the code is throwing NullPointerException. I know it's bacause "result" is being initialized to null. My Question is where I am going wrong. Please give me the solution on how to consume a web service which takes parameters and also returns some thing in response.

Thans and Regards,