Custom ID Generator

[Malte]

Hi !

I'm new to JPA (and OpenJPA). For a new project i consider to use 
OpenJPA as the persistence layer. During my investigations, I came 
across a problem.

The existing system uses a table id generator. The ID saved in the 
id-table is always the last used id. The OpenJPA table-id-generator 
assumes that this is the next available id. I can't change the behaviour 
of the old system, so I'm looking for a solution in the OpenJPA System.

I've been looking for a way to implement a custom id generator, but i 
can't find any working example. Is it even possible to implement a 
custom generator?

Regards
Malte