I want to be able to specify Environment Variables in my Spring Boot Application. I have an external library that I'm using that requires environment variables, and the values to those variables will change according to the environment where we are deploying.
For example, in application.properties of my packaged spring boot jar "myapp-boot-packaged.jar", I add the following property:
foo=bar
The equivalent for java -Dfoo=bar -jar myapp-boot-packaged.jar
You can simply run it informing in the command line like this:
$ java -jar myapp-boot-packaged.jar --foo='bar'
You have to declare in application.properties
foo=${bar}
The when you run it:
Java -jar myApp.jar -Dbar=someValue
You don't have to configure anything it's supported natively.
Spring Boot lets you externalize your configuration so that you can work with the same application code in different environments. You can use properties files, YAML files, environment variables, and command-line arguments to externalize configuration. Property values can be injected directly into your beans by using the @Value annotation, accessed through Spring’s Environment abstraction, or be bound to structured objects through @ConfigurationProperties.
It's done for you, so what you still have to do is to declare your variable in :
If you want to use property per environment (local, dev, production) you can use profiles, a dummy example is to have application-[profile].properties (where [profile] could be dev, prod ...) along with application.properties in the your classpath or externalized (refer to using spring.config.location ).
Note that application profile specific properties override those in application.properties
