The current project that I'm working on is taking an existing fat-client application and starting to move it's functionality to the web. One of the requirements is that I have to use the existing database. This database was originally designed in 1997 and with the exception of tables being added has changed very little since then. That being said, it does some peculair things. One of the things that it does is that it obtains primary key ids from something called an id generator table. For example, if I had a table called "ACTIONS" then there would be another table called "ACTIONS_ID_GENERATOR" that supplies the next available id. I'm trying to make this work with POJOs and annotations. Is this even possible? All of my Hibernate experience has been with databases that were pretty much designed to work with Hibernate. Any ideas on this would be appreciated.