import java.util.concurrent.Callable;
import org.opendaylight.genius.itm.utils.TunnelStateInfo;
-public class TunnelStateAddWorkerForNodeConnector implements Callable<List<ListenableFuture<Void>>> {
+public class TunnelStateAddWorkerForNodeConnector implements Callable<List<? extends ListenableFuture<?>>> {
private final TunnelStateAddWorker tunnelStateAddWorker;
private final TunnelStateInfo tunnelStateInfo;