From cb287e46eb2137d46d34ab63345d1e3bab05e51c Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Tue, 11 Jan 2022 14:33:05 +0100
Subject: [PATCH] Prevent build of empty root jar

---
 build.gradle | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/build.gradle b/build.gradle
index b205ae2..e37be14 100644
--- a/build.gradle
+++ b/build.gradle
@@ -42,6 +42,12 @@ allprojects {
         }
     }
 
+    // Only generate jar for submodules
+    // https://stackoverflow.com/a/25445035
+    jar {
+        onlyIf { !sourceSets.main.allSource.files.isEmpty() }
+    }
+
     // checkstyle
     checkstyle {
         toolVersion = '8.18'