Question

i was wondering if it’s possible to initialize a constant in an interface from a property file using java or using spring messageSource, or such thing is not possible
please advise, thanks.

Answer 1

You can:

public interface Foo {
    String a = Properties.getProperty("foo"); // public static final by default
}

However, that means that Properties.getProperty(..) has to be a static method which relies on an already initialized message source (statically again). Depending on the project and the frameworks you use this might not be the best option.