xfire webservice 返回json，客户端访问报错 could not invoke service

XFIRE搭建的webservice，servic返回JSON格式数据，传递给客户端。发布在tomcat6.0上面。

启动tomcat，客户端测试获取webservice传递的json，报以下错误。

Exception in thread "main" org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: Error invoking 'com.foxhis.service.IGuestRegistrationService.getMasterList(java.lang.String)'. Nested exception is java.lang.reflect.InvocationTargetException: null
org.codehaus.xfire.fault.XFireFault: Error invoking 'com.foxhis.service.IGuestRegistrationService.getMasterList(java.lang.String)'. Nested exception is java.lang.reflect.InvocationTargetException: null
	at org.codehaus.xfire.fault.Soap11FaultSerializer.readMessage(Soap11FaultSerializer.java:31)
	at org.codehaus.xfire.fault.SoapFaultSerializer.readMessage(SoapFaultSerializer.java:28)
	at org.codehaus.xfire.soap.handler.ReadHeadersHandler.checkForFault(ReadHeadersHandler.java:111)
	at org.codehaus.xfire.soap.handler.ReadHeadersHandler.invoke(ReadHeadersHandler.java:67)
	at org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
	at org.codehaus.xfire.client.Client.onReceive(Client.java:406)
	at org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:139)
	at org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48)
	at org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
	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 $Proxy0.getMasterList(Unknown Source)
	at com.westsoft.kft.repairs.util.XFireUtils.main(XFireUtils.java:59)

 原因是：

        导入的包不全。

使用json需要导入以下包：

commons-beanutils-1.8.0.jar
commons-collections-3.2.1.jar
commons-lang-2.5.jar
commons-logging-1.1.1.jar
ezmorph-1.0.6.jar
json-lib-2.4-jdk15.jar