import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
-import javax.annotation.Nullable;
import org.apache.commons.lang3.SerializationUtils;
+import org.eclipse.jdt.annotation.Nullable;
import org.junit.Assert;
import org.junit.Test;
import org.opendaylight.controller.cluster.raft.MockRaftActorContext.MockPayload;