webservice cxf服务器端参数是HashMap问题？求大神帮忙。

Question

服务器端接口：
@WebMethod(operationName = "modifyUser")
@WebResult(name = "DataSyncResult")
public DataSyncResult modifyUser(@WebParam(name = "userid")String userid,@WebParam(name = "domainid")String domainid,
@WebParam(name = "attrs")HashMapattrs);

通过wsdl 生成客户端代码之后调用代码：

IDataSyncServiceService hss = new IDataSyncServiceService();
IDataSyncService idata = hss.getIDataSyncServicePort();
HashMap attrs=new HashMap();
attrs.put("logink-email", "[e-mail]");
System.out.println(idata.modifyUser("10126", "310112", attrs));

modifyUser方法进去看到不是HashMap：
public DataSyncResult modifyUser(
@WebParam(name = "userid", targetNamespace = "")
String userid,
@WebParam(name = "domainid", targetNamespace = "")
String domainid,
@WebParam(name = "attrs", targetNamespace = "")
com.logink.auth.ws.datasyncservice.ModifyUser.Attrs attrs);

为何不是HashMap