docs: @Override
      public void enlistInvocationCallback(InvocationCallback callback, Object cookie) {
          if (ivEJBMethodCallback == null) {
              ivEJBMethodCallback = new ArrayList<InvocationCallback>();
              ivEJBMethodCallbackCookie = new ArrayList<Object>();
          }
  
          ivEJBMethodCallback.add(callback);
          ivEJBMethodCallbackCookie.add(cookie);
      }