import static java.util.Arrays.asList;
import static java.util.Collections.singleton;
import static java.util.Comparator.comparing;
import static java.util.Comparator.naturalOrder;
import static java.util.Comparator.reverseOrder;

import com.google.common.annotations.GwtCompatible;
import com.google.common.testing.EqualsTester;
import java.util.Collections;
import java.util.Comparator;
import java.util.Optional;

                logger.debug("{} does not exists.", dir);
            }
            return;
        }
        try (Stream<Path> walk = Files.walk(dir, FileVisitOption.FOLLOW_LINKS)) {
            walk.sorted(Comparator.reverseOrder()).forEach(f -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleting {}", f);
                }
                try {
                    Files.delete(f);