How to expand property references in jar resources?

Question

I\'m using Gradle to build a jar containing an xml file in META-INF. This file has a row like

Answer 1

I stumbled across this post in a thread about a different but closely related issue. Turns out you want to configure the processResources task, not the jar task:

processResources {
    expand project.properties
}

For some reason, though, I did have to clean once before Gradle noticed the change.