import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
-import javax.annotation.concurrent.GuardedBy;
+import org.checkerframework.checker.lock.qual.GuardedBy;
import org.opendaylight.mdsal.dom.spi.AbstractDOMSchemaService;
import org.opendaylight.yangtools.concepts.ListenerRegistration;
import org.opendaylight.yangtools.concepts.Registration;