import akka.actor.ActorSystem;
import akka.actor.Props;
import com.google.common.annotations.VisibleForTesting;
-import com.google.common.base.Supplier;
import java.util.Collection;
+import java.util.function.Supplier;
import javax.annotation.Nullable;
import org.opendaylight.controller.cluster.DataPersistenceProvider;
import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;