String contentPath = "c:\temp\data";
    String tmpContentPath = "c:\temp\data.TMP";
    if (Files.exists(Paths.get(tmpContentPath)) && Files.list(Paths.get(tmpContentPath)).count() > 0) {
        FileUtils.deleteDirectory(new File(contentPath));
        Files.move(Paths.get(tmpContentPath), Paths.get(contentPath), java.nio.file.StandardCopyOption.REPLACE_EXISTING);
    }