code: public static String createRandomAlphanumeric(final int length) {
  		final Random r = ThreadLocalRandom.current();
  		final char[] randomChars = new char[length];
  		for (int i = 0; i < length; ++i) {
  			randomChars[i] = ALPHANUMERICS[r.nextInt(ALPHANUMERICS.length)];
  		}
  		return new String(randomChars);
  	}
docs: Creates a random Strings consisting of alphanumeric characters with a length of 32.