How to override application.properties during production in Spring-Boot?

Question

I\'m using spring boot and application.properties to select a database during development by @Configuration @Profile(\"dev\").

spri         


        

Answer 1

You can also use @PropertySources

@PropertySources({
        @PropertySource(value = "classpath:application.properties"),
        @PropertySource(value = "file:/user/home/external.properties", ignoreResourceNotFound = true)
})
public class Application {
    public static void main(String[] args) throws Exception {
        ConfigurableApplicationContext context = SpringApplication.run(Application.class, args);

    }


}

Answer 2

I have found the following has worked for me:

java -jar my-awesome-java-prog.jar --spring.config.location=file:/path-to-config-dir/

with file: added.

LATE EDIT

Of course, this command line is never run as it is in production.

Rather I have

• [possibly several layers of] shell scripts in source control with place holders for all parts of the command that could change (name of the jar, path to config...)
• ansible deployment scripts that will deploy the shell scripts and replace the place holders by the actual value.

Answer 3

UPDATE: this is a bug in spring see here

the application properties outside of your jar must be in one of the following places, then everything should work.

21.2 Application property files
SpringApplication will load properties from application.properties files in the following    locations and add them to the Spring Environment:

A /config subdir of the current directory.
The current directory
A classpath /config package
The classpath root

so e.g. this should work, when you dont want to specify cmd line args and you dont use spring.config.location in your base app.props:

d:\yourExecutable.jar
d:\application.properties

or

d:\yourExecutable.jar
d:\config\application.properties

see spring external config doc

Update: you may use \@Configuration together with \@PropertySource. according to the doc here you can specify resources anywhere. you should just be careful, when which config is loaded to make sure your production one wins.

Answer 4

From Spring Boot 2, you will have to use

--spring.config.additional-location=production.properties

Answer 5

Update with Spring Boot 2.2.2.Release.

Full example here, https://www.surasint.com/spring-boot-override-property-example/

Assume that, in your jar file, you have the application.properties which have these two line:

server.servlet.context-path=/test
server.port=8081

Then, in production, you want to override the server.port=8888 but you don't want to override the other properties.

First you create another file, ex override.properties and have online this line:

server.port=8888

Then you can start the jar like this

java -jar spring-boot-1.0-SNAPSHOT.jar --spring.config.location=classpath:application.properties,/opt/somewhere/override.properties

Answer 6

I am not sure you can dynamically change profiles.

Why not just have an internal properties file with the spring.config.location property set to your desired outside location, and the properties file at that location (outside the jar) have the spring.profiles.active property set?

Better yet, have an internal properties file, specific to dev profile (has spring.profiles.active=dev) and leave it like that, and when you want to deploy in production, specify a new location for your properties file, which has spring.profiles.active=prod:

java -jar myjar.jar --spring.config.location=D:\wherever\application.properties