import akka.actor.Props;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
-import com.google.common.base.Supplier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
+import java.util.function.Supplier;
import org.opendaylight.controller.cluster.DataPersistenceProvider;
import org.opendaylight.controller.cluster.raft.ServerConfigurationPayload.ServerInfo;
import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;