OMException java.lang.NullPointerExce

[abdul prodhani]

sir,
i have sented all my code. but i dont know where is wrong ... so please help me

//services.xml file
<service name="service" scope="application">
<description>Weather POJO Service</description>
<messageReceivers>
<messageReceiver mep="http://www.w3.org/2004/08/wsdl/in-only"
class="org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver"/>
<messageReceiver mep="http://www.w3.org/2004/08/wsdl/in-out"
class="org.apache.axis2.rpc.receivers.RPCMessageReceiver"/>
<parameter name="ServiceClass">edujinilabs.Service</parameter>
</service>

//service.java file

package edujinilabs;
import com.edujinilabs.aksh.quiz.Quiz;
public class Service
{

Quiz quiz;

public void submitQuiz(Quiz quiz)
{
this.quiz=quiz;
}
public Quiz getQuiz()
{

return quiz;
}
}
//client file



package client;

import javax.xml.namespace.QName;

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;

import com.edujinilabs.aksh.quiz.Quiz;

public class QuizClient
{
public static void main(String[] args) throws AxisFault
{
RPCServiceClient client = new RPCServiceClient();
Options op = client.getOptions();
EndpointReference epr = new EndpointReference("http://localhost:8080/axis2/services/service");
op.setTo(epr);
//for Quiz

QName opSetQuiz = new QName("http://quiz.aksh.edujinilabs.com/xsd", "submitQuiz");
Quiz q=new Quiz();
q.setDescription("QuizDesc");
q.setTitle("QuizTitle");
q.setQuizId("QuizID");

Object[] opSetQuizArgs = new Object[] {q};
client.invokeRobust(opSetQuiz, opSetQuizArgs);
//Getting MyQuiz Parameter
QName GetInsert1 = new QName("http://quiz.aksh.edujinilabs.com/xsd", "getQuiz");
Object[] opGetQuizArg1 = new Object[] {};
Class[] returnTypes1 = new Class[] {Quiz.class};
Object[] response1 = client.invokeBlocking(GetInsert1, opGetQuizArg1, returnTypes1);
Quiz quiz=(Quiz)response1[0];
if(quiz == null)
{
System.out.println("Time didnot initialize!");
return;
}
System.out.println("Title :" + quiz.getTitle());
System.out.println("Description :" + quiz.getDescription());
System.out.println("getQuiz methoid end......."+quiz.getQuizId());
}
}



///Exception after executing



Exception in thread "main" org.apache.axiom.om.OMException: java.lang.NullPointerException
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:211)
at org.apache.axiom.om.impl.llom.OMNodeImpl.build(OMNodeImpl.java:315)
at org.apache.axiom.om.impl.llom.OMElementImpl.build(OMElementImpl.java:608)
at org.apache.axiom.om.impl.llom.OMElementImpl.detach(OMElementImpl.java:577)
at org.apache.axiom.om.impl.llom.OMNodeImpl.setParent(OMNodeImpl.java:114)
at org.apache.axiom.om.impl.llom.OMElementImpl.addChild(OMElementImpl.java:236)
at org.apache.axiom.om.impl.llom.OMElementImpl.addChild(OMElementImpl.java:192)
at org.apache.axis2.client.ServiceClient.fillSOAPEnvelope(ServiceClient.java:631)
at org.apache.axis2.client.ServiceClient.sendRobust(ServiceClient.java:443)
at org.apache.axis2.client.ServiceClient.sendRobust(ServiceClient.java:426)
at org.apache.axis2.rpc.client.RPCServiceClient.invokeRobust(RPCServiceClient.java:132)
at client.QuizClient.main(QuizClient.java:29)
Caused by: java.lang.NullPointerException
at org.apache.axis2.databinding.utils.BeanUtil.getPullParser(BeanUtil.java:272)
at org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.processProperties(ADBXMLStreamReaderImpl.java:926)
at org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.next(ADBXMLStreamReaderImpl.java:780)
at org.apache.axis2.util.StreamWrapper.next(StreamWrapper.java:68)
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:125)
... 11 more