import java.util.List;
import java.util.Optional;
import java.util.OptionalInt;
-import org.apache.commons.lang.SerializationUtils;
+import org.apache.commons.lang3.SerializationUtils;
import org.junit.Test;
import org.opendaylight.controller.cluster.raft.RaftVersions;
import org.opendaylight.controller.cluster.raft.persisted.ServerConfigurationPayload;