System property is @Sources - how to provide a default value?

[ZaziroZ]

Looks like it is not supported:

@Sources("classpath:org/aeonbits/owner/variableexpansion/${env:-develop}.xml")

Here develop would be a default value for env property.

[Dzmitry]

Yes. It looks like it's not supported yet.
Although it feels like it may be not that hard to add the support, I may be wrong.

I did a little research and looks like changes need to be done for this pattern to look for an additional group.

Something like this:
private static final Pattern PATTERN = compile("\\$\\{([^:]+?)(:(.+?)?)?\\}");

as well as to this block to check if there is a group(3). And if there is one, then use its value instead of an empty string.

Sorry for not trying to come up with a pull request with the implementation, but hopefully the info above is useful to anyone who's going to work on this.

@ZaziroZ ${env:-develop} looks like bash syntax (with - dash before the default value). Probably it would make more sense to use the same syntax as Spring does in its @Value annotation (without the dash)