import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicBoolean;
-import javax.annotation.concurrent.GuardedBy;
+import org.checkerframework.checker.lock.qual.GuardedBy;
import org.opendaylight.bgpcep.topology.TopologyReference;
import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;