code: public static byte[] nextBytes(final int count) {
          Validate.isTrue(count >= 0, "Count cannot be negative.");
  
          final byte[] result = new byte[count];
          RANDOM.nextBytes(result);
          return result;
      }
docs: <p>
  Creates an array of random bytes.
  </p>
  
  @param count
  the size of the returned array
  @return the random byte array
  @throws IllegalArgumentException if {@code count} is negative