Get all the table items from DynamoDB table using Java High Level API

I implemented scan operation using in dynamodb table using dynamodbmapper, but I'm not getting all the results. Scan returns different number of items, whenever I run my program.

Code snippet :

DyanmoDBScanExpression scanExpression = new DynamoDBScanExpression();
List<Books> scanResult = mapper.scan(Books.class, scanExpression);

I investigated into it, and found out about the limit of the items scan returns. But I couln't find a way to get all the items from the table using mapper! Is there a way so I can loop through all the items of the table. I have set enough heap memory in JVM so there won't be memory issues.