Problem With Entity Listeners

[David Beer]

Hi All

I am try to listen for events when an Entity is persisted, updated and
removed. This is simply so that I can update the model which handles the UI.
I have successfully added @EntityListeners(EntryListener.class) anotation to
the entity class. My EntryListener class looks like the following.

public class EntryListener implements EntityListener{

    private PropertyChangeSupport pss = new PropertyChangeSupport(this);
    private EntityNotification en =
Lookup.getDefault().lookup(EntityNotification.class);

    /**
     * Blank no arg constructor
     */
    public EntryListener() {
    }

    @PostPersist
    @Override
    public void postPersist(Object obj) {
        en.postPersist(obj);
    }

    @Override
    public void prePersist(Object obj) {
        Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
"prePersist fired");
    }

    @Override
    public void preUpdate(Object obj) {
        Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
"preUpdate fired");
    }

    @Override
    public void postUpdate(Object obj) {
        Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
"postUpdate fired");
        en.postUpdate(obj);
    }

    @Override
    public void postRemove(Object Obj) {
        Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
"postRemove fired");
    }

    @Override
    public void preRemove(Object obj) {
        Logger.getLogger(EntryListener.class.getName()).log(Level.INFO,
"preRemove fired");
    }

    @Override
    public void addPropertyChangeListener(PropertyChangeListener pcl) {
        pss.addPropertyChangeListener(pcl);
    }

    @Override
    public void removePropertyChangeListener(PropertyChangeListener pcl) {
        pss.removePropertyChangeListener(pcl);
    }

}

The problem is that I seem to be able to catch the event for @postPersist
when a new item is added to the database. I am not closing the EntityManager
each time as a lot of transactions can occur. But am getting the data
straight from the db when updated and then passed to the UI. This works well
for when I add an entry with em.persist. But If I update an item in the UI
and try to either persist the updated item or merge the item no event is
being thrown.

Any advice is much appreciated.

Thanks

David