Reconnect to the updated database.

Main.java

// Create a database and its connection
PersistenceManagerFactory factory = new EmbeddedPersistenceManagerFactory(); //1

factory.setCredentials("onyx", "SavingDataisFun!"); //2

String pathToOnyxDB = System.getProperty("user.home")
        + File.separatorChar + ".onyxdb"
        + File.separatorChar + "sandbox"
        + File.separatorChar +"model-update-db.oxd";
factory.setDatabaseLocation(pathToOnyxDB); //3

factory.initialize();

PersistenceManager manager = factory.getPersistenceManager();  //5