Spring boot external application.properties

Question

I am developing a spring boot application

I want to override some properties in src/main/resources/application.properties with an external file (e.g.

Answer 1

I always use --spring.config.location= in the command line as specified in the documentation, and you can put various files in this, one with default values and another with the overridden ones.

Edit:
Alternatively, you could also use something like :

@PropertySources({
    @PropertySource("classpath:default.properties")
    , @PropertySource(value = "file:${external.config}", ignoreResourceNotFound = true)
})

and specify a external.config in your application.properties.
This would provide a default path for overridding config, that is still overriddable itself by specifying a --external.config in the command line.
I use this with ${external.config} being defined as a system env variable, but it should work with a application.properties variable too.