Spring Boot with Amazon DocumentDB

AWS has a service called DocumentDB. This is a managed NoSQL database with MongoDB compatibility. Only with a couple of clicks, one can easily set up a cluster. This tutorial is about how to connect the SpringBoot application running on the local machine with DocumentDB.

As I previously mentioned it is very easy and fast to create a DocumentDB cluster. But on the other hand, connecting to it outside the AWS cloud is a tedious task. All the clusters are deployed within Amazon VPC and accessible by other Amazon services, but when we need to access it outside of the Amazon private network (VPC) we have to make additional steps.

Imagine we have a Spring Boot application, that handles information about customers and as a persistent storage it uses AWS DocumentDB service. This application exposes REST API with 3 endpoints, one for customer creation and 2 for fetching all customers or a single one by id.

When developing an application we need to test it, for this, we have to connect the local instance of our application to the DocumentDB running on the cloud.

First, we have to create two Security groups, one for the DocumentDB cluster and another for the Bastion EC2 instance. In the AWS console go to EC2->Network & Security->Security Group and press Create security group

Fill up the name of a group, description choose a default VPC. The creation of the VPC is out of the scope of this tutorial. To make it simple I will use a default VPC, but in a real-life project, you may consider a separate…

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