@SuppressWarnings("unchecked") @Override public <T> CloseableIterator<T> iterate(Query query, FactoryExpression<?> projection) { Iterator<T> iterator = null; Closeable closeable = null; if (query instanceof JpaQuery) { JpaQuery<T> elQuery = (JpaQuery<T>) query; elQuery.setHint(QueryHints.RESULT_SET_TYPE, ResultSetType.ForwardOnly); elQuery.setHint(QueryHints.SCROLLABLE_CURSOR, true); final Cursor cursor = elQuery.getResultCursor(); closeable = new Closeable() { @Override public void close() throws IOException { cursor.close(); } }; iterator = cursor; } else { iterator = query.getResultList().iterator(); } if (projection != null) { return new TransformingIterator<T>(iterator, closeable, projection); } else { return new IteratorAdapter<T>(iterator, closeable); } }