Node node = session.getRootNode().addNode("node");
node.addMixin("mix:referenceable");
session.save();
String uuid = node.getIdentifier();
ByteArrayOutputStream out = new ByteArrayOutputStream();
session.exportSystemView("/node", out, true, false);
node.remove();
session.save();
session.importXML("/", new ByteArrayInputStream(out.toByteArray()),
ImportUUIDBehavior.IMPORT_UUID_CREATE_NEW);
session.save();