- Preconditions.checkNotNull(dataBroker, "dataBroker must be set");
- dataTreeChangeListenerRegistration = dataBroker.registerDataTreeChangeListener(
- DataTreeIdentifier.create(CONFIGURATION, TOASTER_IID), this);
+ dataTreeChangeListenerRegistration = requireNonNull(dataBroker, "dataBroker must be set")
+ .registerDataTreeChangeListener(DataTreeIdentifier.create(CONFIGURATION, TOASTER_IID), this);