Java UserPrincipalLookupService look up user

import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileOwnerAttributeView;
import java.nio.file.attribute.UserPrincipal;
import java.nio.file.attribute.UserPrincipalLookupService;

public class Main {

    public static void main(String[] args) {
        Path path = Paths.get("Main.java");
        FileOwnerAttributeView view = Files.getFileAttributeView(path, FileOwnerAttributeView.class);
        try {/*from ww w  .  ja v  a2s .  co  m*/
            UserPrincipalLookupService lookupService = FileSystems.getDefault().getUserPrincipalLookupService();
            UserPrincipal userPrincipal = lookupService.lookupPrincipalByName("Mary");

            view.setOwner(userPrincipal);
            System.out.println("Owner: " + view.getOwner().getName());
        } catch (IOException ex) {
            ex.printStackTrace();
        }

    }
}