What caused the following error ?


package test.client;

import java.util.Calendar;

import org.apache.axis2.databinding.ADBBean;

import test.gen.EchoserviceStub;
import test.service.xsd.Echo;
import test.service.xsd.EchoResponse;
import test.service.xsd.User;



/**
* Client.java
*
* @author Chao Hoi Ka, Eric
*
*/
public class Client {
         public static void main(String[] args) throws Exception {
                 EchoserviceStub stub = new EchoserviceStub();
                 Echo echo = (Echo)((ADBBean)Echo.class.newInstance());
                
                
                 User u = (User)((ADBBean)User.class.newInstance());
                 u.setName("Eric");
                 u.setBirth(Calendar.getInstance());
                
                 echo.setU(u);
                
                
                EchoResponse resp = stub.echo(echo);
            }

}





og4j:WARN No appenders could be found for logger
(org.apache.axiom.om.impl.builder.StAXOMBuilder).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.apache.axis2.AxisFault:
java.lang.NullPointerException
        at 
org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:287)
        at test.gen.EchoserviceStub.echo(EchoserviceStub.java:133)
        at test.client.Client.main(Client.java:40)
Caused by: java.lang.Exception: org.apache.axis2.AxisFault:
java.lang.NullPointerException; nested exception is:
        org.apache.axiom.om.OMException: java.lang.NullPointerException
        at org.apache.axis2.AxisFault.makeFault(AxisFault.java:318)
        at 
org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:136)
        at 
org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive(AbstractInOutSyncMessageReceiver.java:37)
        at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:454)
        at 
org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:284)
        at 
org.apache.axis2.transport.http.HTTPWorker.processRequest(HTTPWorker.java:255)
        at 
org.apache.axis2.transport.http.server.SimpleConnectionThread.run(SimpleConnectionThread.java:92)
        at 
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at 
edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)
Caused by: org.apache.axiom.om.OMException: java.lang.NullPointerException
        at 
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:206)
        at org.apache.axiom.om.impl.llom.OMNodeImpl.build(OMNodeImpl.java:298)
        at 
org.apache.axiom.om.impl.llom.OMElementImpl.detach(OMElementImpl.java:584)
        at 
org.apache.axiom.om.impl.llom.OMNodeImpl.setParent(OMNodeImpl.java:118)
        at 
org.apache.axiom.om.impl.llom.OMElementImpl.addChild(OMElementImpl.java:240)
        at 
org.apache.axiom.om.impl.llom.OMElementImpl.addChild(OMElementImpl.java:197)
        at 
org.apache.axis2.rpc.receivers.RPCUtil.processResponse(RPCUtil.java:71)
        at 
org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:130)
        ... 8 more
Caused by: java.lang.NullPointerException
        at 
org.apache.axis2.databinding.utils.reader.WrappingXMLStreamReader.getEventType(WrappingXMLStreamReader.java:141)
        at 
org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.processProperties(ADBXMLStreamReaderImpl.java:964)
        at 
org.apache.axis2.databinding.utils.reader.ADBXMLStreamReaderImpl.next(ADBXMLStreamReaderImpl.java:807)
        at org.apache.axis2.util.StreamWrapper.next(StreamWrapper.java:68)
        at 
org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:123)
        ... 15 more

        at org.apache.axis2.AxisFault.<init>(AxisFault.java:159)
        ... 3 more

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