import java.util.Queue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
-import javax.annotation.concurrent.GuardedBy;
+import org.checkerframework.checker.lock.qual.GuardedBy;
import org.opendaylight.protocol.pcep.PCEPCloseTermination;
import org.opendaylight.protocol.pcep.PCEPSession;
import org.opendaylight.protocol.pcep.PCEPSessionListener;