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POerror in calling web service from android
 

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    <p>I have an webservice in my localhost has this link</p> <pre><code>http://localhost:8085/firstWS/services/getSum?wsdl </code></pre> <p>which contain this xml codes</p> <pre><code>&lt;wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:ns1="http://org.apache.axis2/xsd" xmlns:ns="http://omar" xmlns:wsaw="http://www.w3.org/2006/05/addressing/wsdl" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" targetNamespace="http://omar"&gt; &lt;wsdl:documentation&gt;Please Type your service description here&lt;/wsdl:documentation&gt; &lt;wsdl:types&gt; &lt;xs:schema attributeFormDefault="qualified" elementFormDefault="qualified" targetNamespace="http://omar"&gt; &lt;xs:element name="sum"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element minOccurs="0" name="a" type="xs:int"/&gt; &lt;xs:element minOccurs="0" name="b" type="xs:int"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;xs:element name="sumResponse"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element minOccurs="0" name="return" type="xs:int"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:schema&gt; &lt;/wsdl:types&gt; &lt;wsdl:message name="sumRequest"&gt; &lt;wsdl:part name="parameters" element="ns:sum"/&gt; &lt;/wsdl:message&gt; &lt;wsdl:message name="sumResponse"&gt; &lt;wsdl:part name="parameters" element="ns:sumResponse"/&gt; &lt;/wsdl:message&gt; &lt;wsdl:portType name="getSumPortType"&gt; &lt;wsdl:operation name="sum"&gt; &lt;wsdl:input message="ns:sumRequest" wsaw:Action="urn:sum"/&gt; &lt;wsdl:output message="ns:sumResponse" wsaw:Action="urn:sumResponse"/&gt; &lt;/wsdl:operation&gt; &lt;/wsdl:portType&gt; &lt;wsdl:binding name="getSumSoap11Binding" type="ns:getSumPortType"&gt; &lt;soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/&gt; &lt;wsdl:operation name="sum"&gt; &lt;soap:operation soapAction="urn:sum" style="document"/&gt; &lt;wsdl:input&gt; &lt;soap:body use="literal"/&gt; &lt;/wsdl:input&gt; &lt;wsdl:output&gt; &lt;soap:body use="literal"/&gt; &lt;/wsdl:output&gt; &lt;/wsdl:operation&gt; &lt;/wsdl:binding&gt; &lt;wsdl:binding name="getSumSoap12Binding" type="ns:getSumPortType"&gt; &lt;soap12:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/&gt; &lt;wsdl:operation name="sum"&gt; &lt;soap12:operation soapAction="urn:sum" style="document"/&gt; &lt;wsdl:input&gt; &lt;soap12:body use="literal"/&gt; &lt;/wsdl:input&gt; &lt;wsdl:output&gt; &lt;soap12:body use="literal"/&gt; &lt;/wsdl:output&gt; &lt;/wsdl:operation&gt; &lt;/wsdl:binding&gt; &lt;wsdl:binding name="getSumHttpBinding" type="ns:getSumPortType"&gt; &lt;http:binding verb="POST"/&gt; &lt;wsdl:operation name="sum"&gt; &lt;http:operation location="sum"/&gt; &lt;wsdl:input&gt; &lt;mime:content type="application/xml" part="parameters"/&gt; &lt;/wsdl:input&gt; &lt;wsdl:output&gt; &lt;mime:content type="application/xml" part="parameters"/&gt; &lt;/wsdl:output&gt; &lt;/wsdl:operation&gt; &lt;/wsdl:binding&gt; &lt;wsdl:service name="getSum"&gt; &lt;wsdl:port name="getSumHttpSoap11Endpoint" binding="ns:getSumSoap11Binding"&gt; &lt;soap:address location="http://localhost:8085/firstWS/services/getSum.getSumHttpSoap11Endpoint/"/&gt; &lt;/wsdl:port&gt; &lt;wsdl:port name="getSumHttpSoap12Endpoint" binding="ns:getSumSoap12Binding"&gt; &lt;soap12:address location="http://localhost:8085/firstWS/services/getSum.getSumHttpSoap12Endpoint/"/&gt; &lt;/wsdl:port&gt; &lt;wsdl:port name="getSumHttpEndpoint" binding="ns:getSumHttpBinding"&gt; &lt;http:address location="http://localhost:8085/firstWS/services/getSum.getSumHttpEndpoint/"/&gt; &lt;/wsdl:port&gt; &lt;/wsdl:service&gt; &lt;/wsdl:definitions&gt; </code></pre> <p>and i'm using this java code to get the data from the server</p> <pre><code>import org.ksoap2.SoapEnvelope; import org.ksoap2.serialization.PropertyInfo; import org.ksoap2.serialization.SoapObject; import org.ksoap2.serialization.SoapPrimitive; import org.ksoap2.serialization.SoapSerializationEnvelope; import org.ksoap2.transport.HttpTransportSE; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.TextView; public class MainActivity extends Activity { TextView tv; private static final String NAMESPACE = "http://omar/"; private static String URL = "http://192.168.1.3:8085/firstWS/services/getSum?wsdl"; private static final String METHOD_NAME = "sum"; private static final String SOAP_ACTION = "getSum"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv=(TextView)findViewById(R.id.hellotv); SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); PropertyInfo propInfo=new PropertyInfo(); propInfo.name="a"; propInfo.type=PropertyInfo.INTEGER_CLASS; request.addPropertyIfValue(propInfo, 5); PropertyInfo propInfo2=new PropertyInfo(); propInfo.name="b"; propInfo.type=PropertyInfo.INTEGER_CLASS; request.addPropertyIfValue(propInfo, 6); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); envelope.setOutputSoapObject(request); HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); try { androidHttpTransport.call(SOAP_ACTION, envelope); SoapPrimitive resultsRequestSOAP = (SoapPrimitive) envelope.getResponse(); tv.setText(resultsRequestSOAP.toString()); } catch (Exception e) { e.printStackTrace(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } </code></pre> <p>but when i run the application I've got this errors fro logcat</p> <pre><code>02-20 05:22:00.951: W/System.err(31571): java.lang.NullPointerException 02-20 05:22:00.961: W/System.err(31571): at java.io.Writer.write(Writer.java:141) 02-20 05:22:00.961: W/System.err(31571): at org.kxml2.io.KXmlSerializer.startTag(KXmlSerializer.java:412) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:594) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.serialization.SoapSerializationEnvelope.writeObjectBody(SoapSerializationEnvelope.java:573) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.serialization.SoapSerializationEnvelope.writeElement(SoapSerializationEnvelope.java:651) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.serialization.SoapSerializationEnvelope.writeBody(SoapSerializationEnvelope.java:555) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.SoapEnvelope.write(SoapEnvelope.java:205) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.transport.Transport.createRequestData(Transport.java:132) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:139) 02-20 05:22:00.961: W/System.err(31571): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:114) 02-20 05:22:00.961: W/System.err(31571): at com.example.wsclient.MainActivity.onCreate(MainActivity.java:49) 02-20 05:22:00.961: W/System.err(31571): at android.app.Activity.performCreate(Activity.java:5191) 02-20 05:22:00.961: W/System.err(31571): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 02-20 05:22:00.961: W/System.err(31571): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) 02-20 05:22:00.961: W/System.err(31571): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 02-20 05:22:00.961: W/System.err(31571): at android.app.ActivityThread.access$600(ActivityThread.java:140) 02-20 05:22:00.961: W/System.err(31571): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 02-20 05:22:00.961: W/System.err(31571): at android.os.Handler.dispatchMessage(Handler.java:99) 02-20 05:22:00.961: W/System.err(31571): at android.os.Looper.loop(Looper.java:137) 02-20 05:22:00.961: W/System.err(31571): at android.app.ActivityThread.main(ActivityThread.java:4898) 02-20 05:22:00.961: W/System.err(31571): at java.lang.reflect.Method.invokeNative(Native Method) 02-20 05:22:00.961: W/System.err(31571): at java.lang.reflect.Method.invoke(Method.java:511) 02-20 05:22:00.961: W/System.err(31571): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 02-20 05:22:00.961: W/System.err(31571): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 02-20 05:22:00.961: W/System.err(31571): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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