I have a small application running on GlassFish. Part of it involves writing some details about a horse to a Derby database. I use an auto-generated session facade and entity class to write to the database. This works correctly, and I can see the data is written correctly using NetBeans SQL editor. If I then use List allHorses = aHorseFacade.findAll(); to fill a list with all the entries in the table the newest entry is duplicated twice and the previous final entry is gone. If I then re-deploy the application it works as expected and findAll() fills the list as it should. Any advice greatly appreciated.
Changing the value of Shared Cache Mode in persistence.xml from Unspecified to None resolves the problem I was having.