VaadinSession session = ui.getSession();
VaadinService service = session.getService();
// Purge pending access calls as they might produce additional changes
// to write out
service.runPendingAccessTasks(session);
ArrayList<ClientConnector> dirtyVisibleConnectors = ui
.getConnectorTracker().getDirtyVisibleConnectors();
LegacyCommunicationManager manager = session.getCommunicationManager();
// Paints components