I\'m trying to create a custom way of computing and passing unique id\'s that follow my own pattern.
Hibernate has the @GenericGenerator annotation that lets you map
If you are using EclipseLink, you can define your own custom Sequence object.
http://wiki.eclipse.org/EclipseLink/Examples/JPA/CustomSequencing
JPA 2.0 does not define a custom sequence generator, but JPA 2.1 does define a Converter API, which may be of use.