Apache Common Id

1. AlphanumericGenerator Generates an incrementing number in base 36 as a String object
2. NumericGenerator Generates an incrementing decimal number as a String object
3. LongGenerator Generates an incrementing number as a Long object
4. SessionIdGenerator Generates an alphanumeric 10+ character identifier with a random component. The exact length depends on the number of ids requested per time period.
5. UUID Generators Generates universally Unique Identifiers based on the IETF Draft Uuid Specification.