About delphi call EJB running in JBoss

Hi,friends
According to what is said on http://laurent.etiemble.free.fr/combridge/ the VB can call EJB in JBoss successfully.However i donot understand why the following program written in delphi can NOT do it
...
jboss: TJBossServices;
JvmControl1: TJvmControl;
...
procedure TForm1.ejbClick(Sender: TObject);
var
home : OleVariant;
bean : OleVariant;
begin
JvmControl1.Classpath :=
'd:\jboss\client\jboss-client.jar;' +
'd:\jboss\client\jboss-common-client.jar;' +
'd:\jboss\client\jboss-j2ee.jar;' +
'd:\jboss\client\jnp-client.jar;' +
'd:\jboss\client\jbosssx-client.jar;' +
'd:\jboss\client\log4j.jar;' +
'd:\myProject\cas\ejb\build\bank.jar' ;

JvmControl1.StartJvm;

jboss.ProviderURL := 'jnp://192.168.1.118:1099';
home := jboss.LookupEjbHome(
'bank/BankBean',
'com.xx.ejb.interfaces.BankHome');
showMessage('bank home varType=' + intToStr(varType(home)));

bean := home.create(); // raise error "Wrong type:cannot convert to Jobject:VT_ERROR"
showMessage('Created Bank');
showMessage(bean.getXml());
bean.remove();
showMessage('ok');
end;

Any suggestion is appreciated !

BTW,
Any interested person can test it by getting all your needs from http://laurent.etiemble.free.fr/combridge/