Client ExceptionFault

[Simone]

Hi,
I've a problem with the client of a web service. I've deployed the service
on axis1.4 and it seems works fine, but when i try to launch the client
receive the following message:


AxisFault
faultCode: { 
http://schemas.xmlsoap.org/soap/envelope/}Server.userException<http://schemas.xmlsoap.org/soap/envelope/%7DServer.userException>
faultSubcode:
faultString: java.lang.NullPointerException
faultActor:
faultNode:
faultDetail:
   { 
http://xml.apache.org/axis/}hostname:localhost.localdomain<http://xml.apache.org/axis/%7Dhostname:localhost.localdomain>

java.lang.NullPointerException
   at org.apache.axis.message.SOAPFaultBuilder.createFault(
SOAPFaultBuilder.java:222)
   at org.apache.axis.message.SOAPFaultBuilder.endElement (
SOAPFaultBuilder.java:129)
   at org.apache.axis.encoding.DeserializationContext.endElement(
DeserializationContext.java:1087)
   at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(
AbstractSAXParser.java :601)
   at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement
(XMLDocumentFragmentScannerImpl.java:1772)
   at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(
XMLDocumentFragmentScannerImpl.java:2923)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(
XMLDocumentScannerImpl.java:645)
   at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(
XMLNSDocumentScannerImpl.java:140)
   at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument
(XMLDocumentFragmentScannerImpl.java:508)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse (
XML11Configuration.java:807)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(
XML11Configuration.java:737)
   at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(
XMLParser.java:107)
   at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(
AbstractSAXParser.java:1205)
   at
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(
SAXParserImpl.java:522)
   at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
   at org.apache.axis.encoding.DeserializationContext.parse(
DeserializationContext.java:227)
   at org.apache.axis.SOAPPart.getAsSOAPEnvelope(SOAPPart.java:696)
   at org.apache.axis.Message.getSOAPEnvelope(Message.java:435)
   at org.apache.axis.handlers.soap.MustUnderstandChecker.invoke(
MustUnderstandChecker.java:62)
   at org.apache.axis.client.AxisClient.invoke(AxisClient.java :206)
   at org.apache.axis.client.Call.invokeEngine(Call.java:2784)
   at org.apache.axis.client.Call.invoke(Call.java:2767)
   at org.apache.axis.client.Call.invoke(Call.java:2443)
   at org.apache.axis.client.Call.invoke (Call.java:2366)
   at org.apache.axis.client.Call.invoke(Call.java:1812)
   at test.Client.ricercaPerTitolo(Client.java:121)
   at test.Finestra$1.widgetSelected(Finestra.java:75)
   at org.eclipse.swt.widgets.TypedListener.handleEvent (TypedListener.java
:90)
   at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
   at org.eclipse.swt.widgets.Display.runDeferredEvents (Display.java:3180)
   at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2856)
   at test.Finestra.<init>(Finestra.java:142)
   at test.Finestra.main(Finestra.java:149)

the client code that cause this exception is:

try{
           Call call=(Call)new Service().createCall();
           call.setTargetEndpointAddress(url);
           call.registerTypeMapping(Evento.class,new
QName("urn:WebServiceName", "Event"),BeanSerializerFactory.class,
BeanDeserializerFactory.class);
           call.setOperationName(new QName("urn:WebServiceName",
"searchByType"));
           result=(Event[])call.invoke(new Object[]{new String("a")});
       }catch(Exception e){
           e.printStackTrace();
       }

I debug the code and when  result=(Event[])call.invoke(new Object[]{new
String("a")});  is called, exception is launched.

What can i do?

Thanks for help