[Recipes] Setting Up Project and Environment For DynamoDB Java Spring Project

Problem:

Set up a basic Java Spring project for working with DynamoDB.

Solution Summary:

I will be using Spring Boot, however, I won’t be using any Spring Boot specific started dependencies for AWS. There will be a separate note on using spring-cloud-starter-aws starter dependency of Spring Boot.

Prerequisites:

This is the beginning of a new lab. Though having done the previous labs are an advantage, it is not a requirement.

Solution Steps:

Context class

I have created a separate context configuration class for DynamoDB in a package called context under the main class package:

package com.buddytutor.aws.dynamodb.context;

…

@Configuration

public class AWSDynamoDBContext {

…

In case of a non-Spring boot application, this context configuration class needs to be imported to the main Spring config file (@Configuration).

I have added the below dependency to maven file:

<dependency>

    <groupId>com.amazonaws</groupId>

    <artifactId>aws-java-sdk-dynamodb</artifactId>

    <version>1.11.98</version>

</dependency>

Note: You may use the latest version available in the maven repository at https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-dynamodb.

I will create two DynamoDB client beans inside AWSDynamoDBContext: one for cloud and one for local. While you have to only specify the region for the cloud, you need to specify the local endpoint for local. I will make the local version as Primary.

// For cloud.

@Bean

    public AmazonDynamoDB amazonDynamoDB() {

        final AWSCredentials credentials = new BasicAWSCredentials(

                awsAccessKeyId,

                awsSecretAccessKey);

        return AmazonDynamoDBClientBuilder.standard()

                .withClientConfiguration(PredefinedClientConfigurations.dynamoDefault())

                .withRegion(awsDynamoDBRegion)

                .withCredentials(new AWSStaticCredentialsProvider(credentials))

                .build();

    }

// For Local.

    @Primary

    @Bean

    public AmazonDynamoDB amazonDynamoDBLocal() {

        final AWSCredentials credentials = new BasicAWSCredentials(

                awsAccessKeyId,

                awsSecretAccessKey);

        return AmazonDynamoDBClientBuilder.standard()

                .withClientConfiguration(PredefinedClientConfigurations.dynamoDefault())

                .withEndpointConfiguration(

                        new AwsClientBuilder.EndpointConfiguration(

                                awsDynamoDBEndpoint,

                                awsDynamoDBRegion))

                .withCredentials(new AWSStaticCredentialsProvider(credentials))

                .build();

    }