OJB-JDO why sequence increment in retrieve

[Alessandro Vincelli]

I use this simple code to retrieve row,
but after this code the db sequence of Utenti table is autoincrement.
Why?
Thanks,Ale


     //1. Get the PersistenceManager
        PersistenceManager persistenceManager = jdo.getPersistenceManager();
        Utenti e = new Utenti();
        e.setId_utente(bean.getId_utente());
        PersistenceBroker broker =
PersistenceBrokerFactory.defaultPersistenceBroker();
        Identity oid = new Identity(e, broker);
        Utenti b = new Utenti();
        //    2. start transaction
        persistenceManager.currentTransaction().begin();
        // 3. Get the Object based on the primary key
        b = (Utenti) persistenceManager.getObjectById(oid, false);
        // 4. Copy data to bean
        copyData(b, bean);
        // 5. End transaction
        persistenceManager.currentTransaction().commit();

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