java webservice调用中参数null的问题

package lavasoft; 
import javax.jws.WebService; 
import javax.xml.ws.Endpoint; 
/** 
　　* Java6开发WebService入门 
　　* 
　　* @author usegear 2009-11-13 16:10:44 
　　*/ 
@WebService 
public class ServiceServer { 
/** 
　　* Web服务中的业务方法 
　　* 
　　* @return 一个字符串 
　　*/ 
public String doSomething(String Myvar ){
    System.out.println(Myvar);
    return (Myvar+" Hello Java6 WebService!你好这个世界！");
    } 
public static void main(String[] args) { 
//发布一个WebService
    Endpoint.publish("http://192.168.1.78:8080/lavasoft.ServiceServer", new ServiceServer());
    }
}

调用接口：

unit SignLibrary_Intf;

{----------------------------------------------------------------------------}
{ This unit was automatically generated by the RemObjects SDK after reading  }
{ the RODL file associated with this project .                               }
{                                                                            }
{ Do not modify this unit manually, or your changes will be lost when this   }
{ unit is regenerated the next time you compile the project.                 }
{----------------------------------------------------------------------------}

{$I RemObjects.inc}

interface

uses
  {vcl:} Classes, TypInfo,
  {RemObjects:} uROXMLIntf, uROClasses, uROClient, uROTypes, uROClientIntf;

const
  { Library ID }
  LibraryUID = '{9BE13FC5-589E-4A60-9910-CA90F4E2C153}';
  WSDLLocation = 'http://192.168.1.78:8080/lavasoft.ServiceServer?wsdl';
  TargetNamespace = 'http://lavasoft/';

  { Service Interface ID's }
  IServiceServerService_IID : TGUID = '{E96358FB-544D-4AE6-B9F5-FAAC000BFC9A}';
  ServiceServerService_EndPointURI = 'http://192.168.1.78:8080/lavasoft.ServiceServer';

type
  TSeekOrigin = Classes.TSeekOrigin; // fake declaration
  { Forward declarations }
  IServiceServerService = interface;


  { IServiceServerService }
  IServiceServerService = interface
    ['{E96358FB-544D-4AE6-B9F5-FAAC000BFC9A}']
    function doSomething(const arg0: UnicodeString): UnicodeString;
  end;

  { CoServiceServerService }
  CoServiceServerService = class
    class function Create(const aMessage: IROMessage; aTransportChannel: IROTransportChannel): IServiceServerService;
  end;

  { TServiceServerService_Proxy }
  TServiceServerService_Proxy = class(TROProxy, IServiceServerService)
  protected
    function __GetInterfaceName:string; override;

    function doSomething(const arg0: UnicodeString): UnicodeString;
  end;

implementation

uses
  {vcl:} SysUtils,
  {RemObjects:} uROEventRepository, uROSerializer, uRORes;

{ CoServiceServerService }

class function CoServiceServerService.Create(const aMessage: IROMessage; aTransportChannel: IROTransportChannel): IServiceServerService;
begin
  Result := TServiceServerService_Proxy.Create(aMessage, aTransportChannel);
end;

{ TServiceServerService_Proxy }

function TServiceServerService_Proxy.__GetInterfaceName:string;
begin
  Result := 'ServiceServerService';
end;

function TServiceServerService_Proxy.doSomething(const arg0: UnicodeString): UnicodeString;
var
  lMessage: IROMessage;
  lTransportChannel: IROTransportChannel;
begin
  lMessage := __GetMessage;
  lTransportChannel := __TransportChannel;
    lMessage.SetAttributes(lTransportChannel, ['InputImportedFromUrl', 'Location', 'OutputImportedFromUrl', 'SoapActionIsEmpty', 'SOAPInputNameOverride', 'SOAPOutputNameOverride', 'TargetNamespace'
      , 'Type', 'Use', 'Wsdl'], 
      ['lavasoft.ServiceServer?xsd=1', 'http://192.168.1.78:8080/lavasoft.ServiceServer', 'lavasoft.ServiceServer?xsd=1', '1', 'doSomething', 'doSomethingResponse', TargetNamespace
       , 'SOAP', 'ioDocument', WSDLLocation]);
     // , 'SOAP', 'literal', WSDLLocation]);
      //ioDocument
  try
    lMessage.InitializeRequestMessage(lTransportChannel, 'SignLibrary', __InterfaceName, 'doSomething');
    lMessage.Write('arg0', TypeInfo(UnicodeString), arg0, []);
    lMessage.Finalize;

    lTransportChannel.Dispatch(lMessage);

    lMessage.Read('return', TypeInfo(UnicodeString), Result, []);
  finally
    lMessage.UnsetAttributes(lTransportChannel);
    lMessage.FreeStream;
    lMessage := nil;
    lTransportChannel := nil;
  end;
end;

initialization
  RegisterProxyClass(IServiceServerService_IID, TServiceServerService_Proxy);


finalization
  UnregisterProxyClass(IServiceServerService_IID);


end.

ioDocument和'literal'注意选择，why？你知道请告诉我。

由d本身通过wsdl进行import的单元如下

// ************************************************************************ //
// The types declared in this file were generated from data read from the
// WSDL File described below:
// WSDL     : http://192.168.1.78:8080/lavasoft.ServiceServer?wsdl
//  >Import : http://192.168.1.78:8080/lavasoft.ServiceServer?wsdl:0
//  >Import : http://192.168.1.78:8080/lavasoft.ServiceServer?xsd=1
// Encoding : UTF-8
// Version  : 1.0
// (2012-12-06 8:58:04 - - $Rev: 10138 $)
// ************************************************************************ //

unit lavasoft;

interface

uses InvokeRegistry, SOAPHTTPClient, Types, XSBuiltIns;

const
  IS_OPTN = $0001;
  IS_UNQL = $0008;


type

  // ************************************************************************ //
  // The following types, referred to in the WSDL document are not being represented
  // in this file. They are either aliases[@] of other types represented or were referred
  // to but never[!] declared in the document. The types from the latter category
  // typically map to predefined/known XML or Borland types; however, they could also 
  // indicate incorrect WSDL documents that failed to declare or import a schema type.
  // ************************************************************************ //
  // !:string          - "http://www.w3.org/2001/XMLSchema"[Gbl]



  // ************************************************************************ //
  // Namespace : http://lavasoft/
  // transport : http://schemas.xmlsoap.org/soap/http
  // style     : document
  // binding   : ServiceServerPortBinding
  // service   : ServiceServerService
  // port      : ServiceServerPort
  // URL       : http://192.168.1.78:8080/lavasoft.ServiceServer
  // ************************************************************************ //
  ServiceServer = interface(IInvokable)
  ['{0BEB1075-6464-A6B0-12F3-8BAF286836C6}']
    function  doSomething(const arg0: WideString): WideString; stdcall;
  end;

function GetServiceServer(UseWSDL: Boolean=System.False; Addr: string=''; HTTPRIO: THTTPRIO = nil): ServiceServer;


implementation
  uses SysUtils;

function GetServiceServer(UseWSDL: Boolean; Addr: string; HTTPRIO: THTTPRIO): ServiceServer;
const
  defWSDL = 'http://192.168.1.78:8080/lavasoft.ServiceServer?wsdl';
  defURL  = 'http://192.168.1.78:8080/lavasoft.ServiceServer';
  defSvc  = 'ServiceServerService';
  defPrt  = 'ServiceServerPort';
var
  RIO: THTTPRIO;
begin
  Result := nil;
  if (Addr = '') then
  begin
    if UseWSDL then
      Addr := defWSDL
    else
      Addr := defURL;
  end;
  if HTTPRIO = nil then
    RIO := THTTPRIO.Create(nil)
  else
    RIO := HTTPRIO;
  try
    Result := (RIO as ServiceServer);
    if UseWSDL then
    begin
      RIO.WSDLLocation := Addr;
      RIO.Service := defSvc;
      RIO.Port := defPrt;
    end else
      RIO.URL := Addr;
  finally
    if (Result = nil) and (HTTPRIO = nil) then
      RIO.Free;
  end;
end;


initialization
  InvRegistry.RegisterInterface(TypeInfo(ServiceServer), 'http://lavasoft/', 'UTF-8');
  InvRegistry.RegisterDefaultSOAPAction(TypeInfo(ServiceServer), '');
  //InvRegistry.RegisterInvokeOptions(TypeInfo(ServiceServer), ioDocument);
//上一句注释掉。why？你知道请告诉我
 //ioLiteral
  // InvRegistry.RegisterInvokeOptions(TypeInfo(ServiceServer), ioLiteral);
end.

调用：

procedure TForm1.Button2Click(Sender: TObject);
var
  myCoServiceServerService : IServiceServerService;
  mysre : WideString;
begin
  myCoServiceServerService := CoServiceServerService.Create(ROSOAPMessage1,ROWinInetHTTPChannel1);
  mysre := '12312';

  edt1.Text := myCoServiceServerService.doSomething('hello 这个万恶的世界');
end;

应用d的import的接口单元调用：

ShowMessage(GetServiceServer().doSomething('hello usegear哇哈哈+ '));

运行结果