Getting entity change set in EclipseLink

gistfile1.java

UnitOfWork works = ((JpaEntityManager) em.getDelegate())
  			.getUnitOfWork();
UnitOfWorkChangeSet changes = works.getCurrentChanges();
ObjectChangeSet objectChangeSet = changes
		.getObjectChangeSetForClone(someEntityInstance);

if (objectChangeSet != null) {
	final List<ChangeRecord> changedProperties = objectChangeSet
			.getChanges();
	for (final ChangeRecord property : changedProperties) {
	}
}