How To Override Application Properties Using External Configuration

Step-by-Step Guide

1. Override using CLI arguments
   Overriding properties is done by using the java -jar command and setting  the properties as -Dproperty.name=value 
   e.g.,

    java -jar -Dproperty.name=value executable-jar-name.jar

   To test this use case, download and unzip demo-0.1.zip.
   By default, the Spring Boot app runs and exposes endpoint at localhost:8090/home
   To override the property, open a terminal and run the following command:

    java -jar -Dserver.port=8080 demo-0.1.jar

   This will expose the endpoint at localhost:8080/home.

2. Override Uuing External application.yml file
   Another option to override properties is by using an external application.yml/application.properties file.
   This file should have the same structure of properties to be overridden, and be at the same path that we execute the java -jar command.
   To test this use case:
   
   1. Download and unzip demo-0.1.zip.
   2. Download application.yml file in the same folder of the extracted jar file
   3. Open Terminal and run java -jar demo.0.1.jar command
   This will expose the endpoint at localhost:8080/home

Attachments

application.yml
demo-0.1.zip

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