private static boolean lockInstance(final String lockFile) {
		try {
			final File file = new File(lockFile);
			final RandomAccessFile randomAccessFile = new RandomAccessFile(
					file, "rw");
			final FileLock fileLock = randomAccessFile.getChannel().tryLock();
			if (fileLock != null) {
				Runtime.getRuntime().addShutdownHook(new Thread() {
					public void run() {
						try {
							fileLock.release();
							randomAccessFile.close();
							file.delete();
						} catch (Exception e) {
							System.err.println("Unable to remove lock file: "
									+ lockFile);
							e.printStackTrace();
						}
					}
				});
				return true;
			}
		} catch (Exception e) {
			System.err
					.println("Unable to create and/or lock file: " + lockFile);
			e.printStackTrace();
		}
		return false;
	}