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Problem Statement:

For DAO Layer unit testing, there isn't an embedded simulation of Oracle. There is H2, but there are several differences between the H2 simulation and Oracle.

Solution:

This project solves the problem by providing the Oracle instance as a Docker Image and spinning up a container with Oracle in it.

<dependency>
    <groupId>com.nnarendravijay</groupId>
    <artifactId>embeddedOracle</artifactId>
    <version>0.0.1</version>
</dependency>

More Details:

It nealy takes about a minute of two for starting up the default VM and caching the Docker Image you first run this on a machine (but, completely depends on the network bandwidth). After the first run, the Docker image is cached and it takes a maximum of 15 seconds for the container and Oracle to startup and available for accepting connections.

Prerequisites:

Docker installed on your machine.

Database Versioning/Migrations:

You can use your own migrations and could use Flyway or Liquibase, whichever you prefer for setting up your data.