axis-1.4开发webservice，获取天气预报wsdl 报错！！！

public class Test {

public String getWeather()throws ServiceException, MalformedURLException, RemoteException{  
String endpoint =  "http://www.webxml.com.cn/WebServices/WeatherWebService.asmx";
    Service  service = new Service();
    
    Call  call  = (Call) service.createCall();    call.setTargetEndpointAddress(new java.net.URL(endpoint) );
    call.setUseSOAPAction(true); 
    call.setSOAPActionURI("http://WebXml.com.cn/getWeatherbyCityName"); 
   call.setOperationName(new QName("http://WebXml.com.cn/","getWeatherbyCityName"));   // String ret = (String) call.invoke( new Object[] { "Hello!" } );
    String ret =(String)call.invoke(new Object[] {"江西"});    System.out.println("getMessage:" + ret );
    return ret;
}
public static void main(String[] args) throws MalformedURLException, RemoteException, ServiceException  {
Test t=new Test();
t.getWeather();
         }}
报错如下：
Exception in thread "main" AxisFault
 faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server
 faultSubcode: 
 faultString: 服务器无法处理请求。 ---> 未将对象引用设置到对象的实例。
 faultActor: 
 faultNode: 
 faultDetail: 
{http://xml.apache.org/axis/}stackTrace:服务器无法处理请求。 ---> 未将对象引用设置到对象的实例。
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 org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
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.getQQState(Test.java:44)
at Test.main(Test.java:52)