Persistence

Backends as a Service (BaaS) usually refers to persisting data in a data store of some sort. This could be a relational database, a graph database or other NoSQL store.

For web applications it's usually best to interact with these via a REST API. You can find a good pragmatic introduction here

http://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/getting-started.html

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Auth

Use:


        DynamoDB dynamoDB = new DynamoDB(new AmazonDynamoDBClient(
        new EnvironmentVariableCredentialsProvider()));

Instead of:


        DynamoDB dynamoDB = new DynamoDB(new AmazonDynamoDBClient(
        new ProfileCredentialsProvider()));

and ensure you set the Amazon Region appropriately:

AmazonDynamoDBClient client = new AmazonDynamoDBClient(
        new EnvironmentVariableCredentialsProvider());

        client.setRegion(Region.getRegion(Regions.EU_WEST_1));
        client.setSignerRegionOverride("eu-west-1");

        DynamoDB dynamoDB = new DynamoDB(client);