Environment Specific application.properties file in Spring Boot application

In my Spring Boot application, i want to create environment specific properties file. The packaging type of my application in war and i am executing it in embedded tomcat. I use sts and execute the main from sts itself.

1. Can i have environment specific properties file like application-${env-value}.properties?

In above case, env-value will have values as local/devl/test/prod

2. Where to set the env-value file? For local, i can set it as the jvm argument through sts

3. Who reads the application.properties in Spring Boot application.

4. How to load the environment specific properties file? For ex - if i set the database uid,pwd, schema etc in environment specific property file, in that case will the datasource be able to understand the properties in it?

5. Can i use application.properties and application-local.properties file at same time?

Spring Boot already has support for profile based properties.

Simply add an application-[profile].properties file and specify the profiles to use using the spring.profiles.active property.

-Dspring.profiles.active=local

This will load the application.properties and the application-local.properties with the latter overriding properties from the first.

Yes you can. Since you are using spring, check out @PropertySource anotation.

Anotate your configuration with

@PropertySource("application-${spring.profiles.active}.properties")

You can call it what ever you like, and add inn multiple property files if you like too. Can be nice if you have more sets and/or defaults that belongs to all environments (can be written with @PropertySource{...,...,...} as well).

@PropertySources({
  @PropertySource("application-${spring.profiles.active}.properties"),
  @PropertySource("my-special-${spring.profiles.active}.properties"),
  @PropertySource("overridden.properties")})

Then you can start the application with environment

-Dspring.active.profiles=test

In this example, name will be replaced with application-test-properties and so on.

we can do like this:

in application.yml:

spring:
  profiles:
    active: test //modify here to switch between environments
    include:  application-${spring.profiles.active}.yml

in application-test.yml:

server:
  port: 5000

and in application-local.yml:

server:
  address: 0.0.0.0
  port: 8080

then spring boot will start our app as we wish to.

My Point , IN this arent way asking developer to create all environment related in single go, resulting in risk of exposing Production Configuration to end developer

as per 12-Factor, shouldnt be enviornment specific reside in Enviornment only .

How do we do for CI CD

• Build Spring one time and promote to aother environment, in that case, if we have spring jar has all environment, it iwll security risk, having all environment variable in GIT