From: mthalis <dinesh_nadeera_at_yahoo.com>
Date: Thu, 31 Dec 2009 01:50:42 -0800 (PST)

I want to handle concurrency in order to do it I use optimistic locking, I'm
new to locking below show my code. Is this code enough for handle
concurrency or is this code write?


@TransactionAttribute(TransactionAttributeType.REQUIRED)
    public void udateRole() {
        Role role;
        try {
            role = em.find(Role.class, "1");
            em.lock(role, LockModeType.WRITE);
            Query query = em.createQuery("UPDATE Role s SET s.roleName =
:roleName");
            query.setParameter("roleName", "6");
            query.executeUpdate();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

please give you're precious comments.

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