dotenv is a Java library that loads environment variables from a .env file. Storing configuration in the environment separate from code is based on The Twelve-Factor App methodology.

Environment variables listed in the host environment override those in .env file.

Use DotEnv.get("...") instead of Java's System.getenv("...").

Since Java does not provide a way to set environment variables on a currently running process, vars listed in .env cannot be set and thus cannot be retrieved using System.getenv("...").

Step 1. Add the JitPack repository to your build file

Add it in your root build.gradle at the end of repositories:

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

Step 2. Add the dependency

dependencies {
    implementation 'com.salvadormontiel:dotenv:0.0.2'
}

Create a .env file in the root directory of your project. Add environment-specific variables on new lines in the form of NAME=VALUE. For example:

# formatted as key=value
DB_HOST=localhost
DB_USER=root
DB_PASS=your_super_password

That's it.

DotEnv now has the keys and values you defined in your .env file.

import com.salvadormontiel.dotenv.DotEnv;

DotEnv.get("DB_HOST");
// localhost

The parsing engine currently supports the following rules:

• BASIC=basic becomes {BASIC: 'basic'}
• empty lines are skipped
• lines beginning with # or // are treated as comments