Type Reason Java.Util.Prefs.BackingStoreException if the backing store is unavailable or causes an operation failure. Java.Lang.IllegalStateException if this node has been removed.
Synchronizes the data of this preference node and its descendants with the back-end preference store. Any changes found in the back-end data should be reflected in this node and its descendants, and at the same time any local changes to this node and descendants should be persisted.