Unexpected wrapper element XX found. 问题

我使用axis调用

Call call = (Call) service.createCall();
call.setoperationName("方法名");

在调用webservice服务端的时候报错

Unexpected wrapper element 方法名 found. 

Exception in thread "main" AxisFault
 faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Client
 faultSubcode: 
 faultString: Unexpected wrapper element 方法名found.   Expected {http://xx.com/} 方法名
 faultActor: 
 faultNode: 
 faultDetail: 
{http://xml.apache.org/axis/}stackTrace:Unexpected wrapper element 方法名 found.   Expected {http://xx.com/} 方法名

修改成如下

Call call = (Call) service.createCall(); call.setoperationName(new QName("命名空间地址","方法名"));