private void checkRequiredSlots( SubmitObjectsRequest req, String[] slotNames, List<SlotType1> slots, String prefix) { SlotType1 slot; for (int i = 0; i < slotNames.length; i++) { slot = XDSTestUtil.removeSlot(slots, slotNames[i]); doRegisterDocumentAndCheckError(req, XDSException.XDS_ERR_REGISTRY_METADATA_ERROR, prefix); slots.add(slot); } }