Make dotenv env variables available in System.getProperty() too

Q: Why should I use dotenv.get(“MY_ENV_VAR”) instead of System.getenv(“MY_ENV_VAR”) A: 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(…).

Given that System.getenv("MY_ENV_VAR") doesn’t allow adding new environment variables at runtime, the other option is to plug the dotenv configured variables into System.setProperty().

This will allow libraries to use either System.getProperty("MY_ENV_VAR") or dotenv.get("MY_ENV_VAR").

A simple change would look like this after Dotenv is created.

Dotenv
   .load()
   .entries()
   .filter(entry -> System.getProperty(entry.getKey) == null)
   .forEach(entry -> System.setProperty(entry.getKey(), entry.getValue()));

[jongio]

I published a new blog with this update: https://blog.jongallant.com/2020/05/java-dotenv-azure-sdk-update/

[jongio]

Very cool. Thanks for doing this.