GetInfoResult result = new GetInfoResult();//这个类是在客户端重新创建了一个和服务端完全一样的自定义类
try {
Service service = new Service();
Call call = (Call) service.createCall();
call.setReturnType(new QName(namespace,"GetInfoResult"));
call.setReturnClass(GetInfoResult.class);
call.setReturnQName(new QName(namespace,"GetInfoResult"));

call.setTargetEndpointAddress(new java.net.URL(url));
call.setUseSOAPAction(true);
call.setSOAPActionURI(soapActionURI);
call.setOperationName(new QName(namespace,methodName));

call.addParameter(new QName(namespace,"Srcid"),XMLType.XSD_STRING,ParameterMode.IN);
call.addParameter(new QName(namespace,"bDate"),"Edate"),ParameterMode.IN);

result = (GetInfoResult)call.invoke(paraObject);
}
catch (Exception e) {
e.printStackTrace();
}
报如下错误：
0 ERROR client.Call invoke.2418 - No returnType was specified to the Call object! You must call setReturnType() if you have called addParameter().

第一次接触webservice，求高手帮忙！