Hi Malte, Welcome to OpenJPA! Maybe this is old information since you have already been experimenting with the id generation, but I would first point you at this information. Basic id generation is documented here: http://ci.apache.org/projects/openjpa/trunk/docbook/manual.html#jpa_overview_meta_gen
>From here, there is some information on the various built-in generators: http://ci.apache.org/projects/openjpa/trunk/docbook/manual.html#ref_guide_sequence Since it sounds like you have a unique case for the table generator, you might want to consider extending the OpenJPA table generator and substitute your unique processing: *You can use JPA SequenceGenerators to describe any built-in Seqs or your own Seq implementation. Set the sequenceName attribute to a plugin string describing your choice. * * * * * * If specifying your own class name, you must include parentheses at the end of the class name, even if you have no plugin properties to configure. (E.g., sequenceName="com.example.SeqImpl()". * http://ci.apache.org/projects/openjpa/trunk/docbook/manual.html#jpa_overview_mapping_sequence Hope this helps! Kevin On Sun, Aug 18, 2013 at 1:06 PM, Malte <malte.neum...@googlemail.com> wrote: > 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 >
