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                                &nbsp;
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                                            <p style="margin: 10px 0 0 0">I'm working on a JpaMergeEventListener to clean the dirty-Flag on unchanged collections:</p> 
                                            <div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
                                                <div class="preformattedContent panelContent" style="padding: 9px 12px"> 
                                                    <pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">public class MyIntegrator implements Integrator {

    public void integrate(Configuration configuration, SessionFactoryImplementor sessionFactory,
            SessionFactoryServiceRegistry serviceRegistry) {
        EventListenerRegistry listenerRegistry = serviceRegistry.getService(EventListenerRegistry.class);

        listenerRegistry.setListeners(EventType.MERGE, new MyMergeEventListener());
    }

    public void integrate(MetadataImplementor metadata, SessionFactoryImplementor sessionFactory,
            SessionFactoryServiceRegistry serviceRegistry) {
        // TODO Auto-generated method stub       
    }

    public void disintegrate(SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
        // TODO Auto-generated method stub        
    }

    private static class MyMergeEventListener extends JpaMergeEventListener {

        private List&lt;PersistentCollection&gt; cleanCollections = new ArrayList&lt;PersistentCollection&gt;();

        @Override
        protected void copyValues(EntityPersister persister, Object entity, Object target, SessionImplementor source, Map copyCache) {
            Object[] origValues = persister.getPropertyValues(entity);
            Object[] targetValues = persister.getPropertyValues(target);
            Type[] types = persister.getPropertyTypes();

            // get Collections to be marked as clean
            // Do this BEFORE copyValues() is called, afterwards targetValues will be updated
            for (int i = 0; i &lt; types.length; i++) {
                if (types[i].isCollectionType()) {
                    checkCollection((Collection) origValues[i], (PersistentCollection) targetValues[i]);
                }
            }

            super.copyValues(persister, entity, target, source, copyCache);

            // Reset the dirtyFlag of unmodified collections
            for (PersistentCollection col : cleanCollections) {
                col.clearDirty();
            }
        }

        private void checkCollection(Collection origValue, PersistentCollection targetValue) {
            Collection target = (Collection) targetValue.getValue();

            if (origValue.size() != target.size()) {
                return;
            }

            if (origValue.size() == 0 &amp;&amp; target.size() == 0) {
                return;
            }

            if (origValue.containsAll(target)) {
                cleanCollections.add(targetValue);
            }
        }
    }
}
</pre> 
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