How to load property file based on spring profiles

For Spring Boot applications it will work easily even by using a YAML File

spring: 
  profiles: dev
  property: this is a dev env
---
spring: 
  profiles: prod
  property: this is a production env 
---

However, for a Spring MVC application, it needs more work. Have a look at this link

Basically, it involves 2 steps

1. Get the Spring Profile within servlet context

If you have set the profile on the server and want it to retrieve it within your application you can use System.getProperty or System.getenv methods. Here is the code which fetches the profile and defaults it to a local profile, if no profile has been found.

private static final String SPRING_PROFILES_ACTIVE = "SPRING_PROFILES_ACTIVE";
String profile;

/**
 * In local system getProperty() returns the profile correctly, however in docker getenv() return profile correctly
 * */
protected void setSpringProfile(ServletContext servletContext) {
if(null!= System.getenv(SPRING_PROFILES_ACTIVE)){
    profile=System.getenv(SPRING_PROFILES_ACTIVE);
}else if(null!= System.getProperty(SPRING_PROFILES_ACTIVE)){
    profile=System.getProperty(SPRING_PROFILES_ACTIVE);
}else{
    profile="local";
}
log.info("***** Profile configured  is  ****** "+ profile);

servletContext.setInitParameter("spring.profiles.active", profile);
}

2. To access the application-dev.properties, say now you will need to use @Profile("dev") at the class level

The following code will fetch the application-dev.properties and common.properties

@Configuration
@Profile("dev")
public class DevPropertyReader {


    @Bean
    public static PropertyPlaceholderConfigurer properties() {
    PropertyPlaceholderConfigurer ppc = new PropertyPlaceholderConfigurer();
    Resource[] resources = new ClassPathResource[] { new ClassPathResource("properties/common.properties"), new ClassPathResource("properties/application-dev.properties") };
    ppc.setLocations(resources);
    ppc.setIgnoreUnresolvablePlaceholders(true);
    return ppc;
    }
}

For accessing say application-prod.properties you have to use @Profile("prod") at the class level. More details can be found here

Put property file in same location as application.property and follow the naming convention application-{profile}.properties like application-dev.properties,application-test.properties, application-prod.properties

And in application.properties set spring.profiles.active=dev,test etc

I'll give step by step procedure for Spring boot applications.

1. Inside /src/main/resources/application.properties mention spring.profiles.active=dev (or Prod)
2. Create /src/main/resources/application-dev.properties and give your custom dev configurations here.
3. Create /src/main/resources/application-prod.properties and give your custom prod configurations here.

Run.