public static List<File> getAllFilesInDirectory(String directoryPath) throws IOException {
		try (Stream<Path> walk = walk(get(directoryPath))) {
			return walk
				.filter(Files::isRegularFile)
				.map(Path::toFile)
				.collect(toList());
		}
	}
@param directoryPath Directory path for searching files.
ngrinder-core/src/main/java/net/grinder/util/FileUtils.java