Duplicate error when using Gradle 7.1+

[AZWN]

Summary

Gradle 7+ detects overlapping files when creating Jars. This causes errors in some builds.

What you did

Run gradle :spoofax3.lwb.root:statix.cli:executableJar (with gradle 7.6.2) on a clean repository

What you expected to happen

Build succeeding

What actually happened

Error:

Execution failed for task ':spoofax3.lwb.root:statix.cli:executableJar'.
> Entry mb/statix/package-info.class is a duplicate but no duplicate handling strategy has been set. Please refer to https://docs.gradle.org/7.6.2/dsl/org.gradle.api.tasks.Copy.html#org.gradle.api.tasks.Copy:duplicatesStrategy for details.

Context

• Spoofax version: 0.19.5 - develop
• Operating system & version: MacOS 13
• Java version (if applicable): 11
• Gradle version (if applicable): 7.6.2

Additional information

Reporting this because it may hinder upgrading to more recent gradle versions. Also occurs in metaborg/pie examples.