Saving multiple values to DynamoDb at Amazon AWS - splitting list of items to be save so it doesn't exceed limits of one request (28, 25 is just for safety), as well with checking if there are no items left to saved - leftovers due to exceeding throughput limits. Might be useful for people working with Amazon DynamoDb and Java SDK.

testAmazon.java

private static void writeDynamoMultipleItems(ArrayList<Item> itemsBatchWrite, String tableName, DynamoDB dynamoDB) {
        System.out.println("Write to DynamoDB with " + itemsBatchWrite.size() + " items");
        if (itemsBatchWrite.size() > 25) {
            System.out.println("Splitting table");
            ArrayList<Item> writeItems = new ArrayList<>();
            for (Item item : itemsBatchWrite) {
                if (writeItems.size() < 25) {
                    writeItems.add(item);
                } else {
                    writeDynamoMultipleItems(writeItems, tableName, dynamoDB);
                    writeItems.clear();
                }
            }
            if (writeItems.size() > 0) {
                writeDynamoMultipleItems(writeItems, tableName, dynamoDB);
                writeItems.clear();
            }
            return;
        }
        TableWriteItems steamPricesTableWriteItems = new TableWriteItems(tableName);
        steamPricesTableWriteItems.withItemsToPut(itemsBatchWrite);
        BatchWriteItemOutcome outcome = dynamoDB.batchWriteItem(steamPricesTableWriteItems);
        itemsBatchWrite.clear();
        do {// Check for unprocessed keys which could happen if you exceed provisioned throughput
            Map<String, List<WriteRequest>> unprocessedItems = outcome.getUnprocessedItems();
            if (outcome.getUnprocessedItems().size() == 0) {
                System.out.println("No unprocessed items found");
            } else {
                System.out.println("Retrieving the unprocessed items");
                outcome = dynamoDB.batchWriteItemUnprocessed(unprocessedItems);
            }
        } while (outcome.getUnprocessedItems().size() > 0);
    }

Append this line of code after line number # 11.
writeItems.add(item);