import akka.actor.PoisonPill;
import akka.dispatch.OnComplete;
import com.google.common.annotations.VisibleForTesting;
-import javax.annotation.concurrent.GuardedBy;
+import org.checkerframework.checker.lock.qual.GuardedBy;
import org.opendaylight.controller.cluster.datastore.exceptions.LocalShardNotFoundException;
import org.opendaylight.controller.cluster.datastore.messages.CloseDataTreeNotificationListenerRegistration;
import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener;