使用 Gradle 从 Spring Boot 中的环境变量设置 spring.profiles.active

Question

My company has a standard way to specifying the environment a web service should run in, specifically 'development' and 'production' by using an environment variable APP_ENV. Each of these environments have a separate config file: application-dev.yml and application-prod.yml.

In spring boot, we can use SPRING_PROFILES_ACTIVE or equivalents to do this, but what I really want to do is grab the VALUE from APP_ENV, and use that as the profile.

I've got some code

SpringApplication app = new SpringApplication(Application.class);
springApp.setAdditionalProfiles(System.getenv("APP_ENV"););
springApp.run(args);

Any tips on how to do this a bit cleaner? I'm getting java.lang.IllegalStateException: Failed to load ApplicationContext errors on various gradle tasks that make this solution kind of flimsy.

Answer 1

you can use System.getProperty which will always return a String like below,

springApp.setAdditionalProfiles(System.getProperty("APP_ENV", "dev"));

In the above snippet, we use System.getProperty(“APP_ENV”) to extract the value of the property APP_ENV. We also are making use of the default value so if the property is not available in the system, getProperty returns dev.