jacob c++里方法的类型是bstr ,为啥JAVA调用时老是出错

Question

[id(4)] HRESULT sayHello2([in] BSTR say, [out, retval] BSTR* result);

ComThread.InitMTA(true);
ActiveXComponent com = new ActiveXComponent("CLSID:FF90EFCA-0856-4159-A9CC-0E7BBC317554") ;

  Dispatch disp = (Dispatch) com.getObject();
  Variant  a = new Variant(11);
  Variant  b = new Variant(2);
  Variant c  =  new Variant();

  c = Dispatch.call(disp, "Add",2,3);
  System.out.println(c.toString());
  Variant v = Dispatch.call(disp, "sayHello2","fuck");

  System.out.println(v.toString());
     Can't map name to dispid: sayHello2