private static <E, X extends Exception> List<E> eagerFetch(PageSupplier<E, X> supplier, int size) throws X { Page<? extends E> page = supplier.getPage(size, 0); ArrayList<E> container = new ArrayList<>(page.hasNextPage() ? page.getItemsCount() * 2 : page.getItemsCount()); while (page.hasNextPage()) { container.addAll(page.getItems()); PageRef next = page.getNextPageRef(); page = supplier.getPage(next.getPageSize(), next.getItemsBefore()); } container.addAll(page.getItems()); return container; }