ksoap - Android ksoap2 object reference null exception -

here class calling soap. i'm getting following error , don't understand why.

ava.lang.nullpointerexception: attempt invoke virtual method 'java.lang.string org.ksoap2.serialization.soapprimitive.tostring()' on null object reference

public class webservicescontroller {  private static final string namespace = "http://mywebsite.com:9000/"; private static final string asmxurl = "services.asmx?";  private string tag = "pgguru"; static soapprimitive resultstring;  public static void soapactionexecutestoredprocedure(string method_name,list<string> argumentpipevalue) throws xmlpullparserexception, ioexception {      soapobject request = new soapobject(namespace, method_name);     //add arguments in     (string arg : argumentpipevalue) {         string[] splitargs = arg.split("|");         request.addproperty(splitargs[0], splitargs[1]);     }     soapserializationenvelope envelope = new soapserializationenvelope(soapenvelope.ver11);      envelope.setoutputsoapobject (request);     envelope.dotnet  = true;     httptransportse ht = new httptransportse(namespace+asmxurl);       ht.call (method_name, envelope);     soapobject response = (soapobject)envelope.getresponse();     string result = response.getproperty(0).tostring();  } } 

and here how call it.

  bt.setonclicklistener( new view.onclicklistener() {          @override         public void onclick(view v) {             log.i(tag, "doinbackground");             list<string> myargs = new arraylist<string>();             myargs.add("_caseid|apples");             try {                 webservicescontroller.soapactionexecutestoredprocedure("djprovider_delete", myargs);             } catch (exception e) {             }         }     }); 

any pointers fantastic. don't understand how use ksoap, i've followed few tutorials , keep getting error.

i think getting error on line

**string result = response.getproperty(0).tostring();**

if that's case please check whether getting response @ all. if getting no response @ all, reason.

check if providing arguments webservice correctly. when using soap have provide arguments in particular structure, soap object inside soap object. check soap object creating , 1 required same. (just print request.tostring() checking)

ps: meant put in comment section. dont have enough reputation.