webService错误

Question

public static void main(String[] args) {
 Service srvcModel = new
      ObjectServiceFactory().create(ZtService.class);
      XFireProxyFactory factory =
         new XFireProxyFactory(XFireFactory.newInstance().getXFire());
      String url ="http://127.0.0.1:8080/ZtServicePro/ZtService";
      try {
       ZtService srvc = (ZtService)factory.create(srvcModel, url);
         String result = srvc.getRanking();
         System.out.print(result);
      } catch (MalformedURLException e){
         e.printStackTrace();
      } }我调用getRanking（）方法，getRanking（）方法里只有return "1";没有任何代码。但运行后出现
log4j:WARN No appenders could be found for logger (org.codehaus.xfire.transport.DefaultTransportManager).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: Couldn't send message.
org.codehaus.xfire.fault.XFireFault: Couldn't send message.
at org.codehaus.xfire.fault.XFireFault.createFault(XFireFault.java:89)
at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:30)
at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79)
at org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114)
at org.codehaus.xfire.client.Client.invoke(Client.java:336)
at org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77)
at org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57)
at $Proxy6.getRanking(Unknown Source)
at com.zt.model.WebServiceClientTest.main(WebServiceClientTest.java:23)
Caused by: org.codehaus.xfire.XFireException: Couldn't send message.
at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:145)
at org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48)
at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
... 8 more
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:79)
at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:121)
at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1321)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
at org.codehaus.xfire.transport.http.CommonsHttpMessageSender.send(CommonsHttpMessageSender.java:369)
at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:123)
... 10 more
请问高手，为什么会出现这样的错误，改怎么解决