Page History

        EntityManagerFactory emf = 
            Persistence.createEntityManagerFactory("BeanValidation");
        EntityManager em = emf.createEntityManager();

        Location loc = new Location();
        loc.setCity("Rochester");
        loc.setState("MN");
        loc.setZipCode("55901");
        loc.setCountry("USA");

        // Create an Image with non-matching type and file extension
        Image img = new Image();
        img.setType(ImageType.JPEG);
        img.setFileName("Winter_01.gif");
        loadImage(img);
        img.setLocation(loc);
        
        // *** PERSIST ***
        try {
            em.getTransaction().begin();
            // Persist the entity with non-matching extension and type
            em.persist(img);
        } catch (ConstraintViolationException cve) {
            // Transaction was marked for rollback, roll it back and
            // start a new one
            em.getTransaction().rollback();
            em.getTransaction().begin();
            // Fix the file type and re-try the persist.
            img.setType(ImageType.GIF);
            em.persist(img);
            em.getTransaction().commit();
        }

        // *** UPDATE ***
        try {
            em.getTransaction().begin();
            // Modify the file name to a non-matching file name 
            // and commit to trigger an update
            img.setFileName("Winter_01.jpg");
            em.getTransaction().commit();
        }  catch (ConstraintViolationException cve) {
            // Handle the exception.  The commit failed so the transaction
            // was already rolled back.
            handleConstraintViolation(cve);
        }
        // The update failure caused img to be detached. It must be merged back 
        // into the persistence context.
        img = em.merge(img);

        // *** REMOVE ***
        em.getTransaction().begin();
        try {
            // Remove the type and commit to trigger removal
            img.setType(ImageType.GIF);
            em.remove(img);
            em.getTransaction().commit();
        }  catch (ConstraintViolationException cve) {
            // Rollback the active transaction and handle the exception
            em.getTransaction().rollback();
            handleConstraintViolation(cve);
        }
        em.close();
        emf.close();