From a3223248e37e2f3efb09c009a5fcaf79ab6baf67 Mon Sep 17 00:00:00 2001
From: domi41 <dominique.merle.41@gmail.com>
Date: Fri, 24 Apr 2026 22:51:49 +0200
Subject: [PATCH 1/3] config: update the gradle wrapper

---
 build.gradle                             | 4 +++-
 gradle/wrapper/gradle-wrapper.properties | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/build.gradle b/build.gradle
index 3519cae..aa681a3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,9 +10,11 @@ apply plugin: 'java-library'
 
 // In this section we declare where to find the dependencies of our project
 repositories {
-    // Use jcenter for resolving our dependencies.
     // We can declare any Maven/Ivy/file repository here.
+
+    // Use jcenter for resolving our dependencies.
     //jcenter()
+
     mavenCentral()
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 5be06f5..de5ecef 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,4 +1,4 @@
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists

From aee96b12b63cea5e17ff6abbd991235eee552d32 Mon Sep 17 00:00:00 2001
From: domi41 <dominique.merle.41@gmail.com>
Date: Fri, 24 Apr 2026 22:53:06 +0200
Subject: [PATCH 2/3] docs: document how to show the full stacktrace in case of
 test errors

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 9ec7be3..beb1c07 100644
--- a/README.md
+++ b/README.md
@@ -142,7 +142,7 @@ ResultInterface result = mj.deliberate(tally);
 
 Install [maven](https://maven.apache.org), and run:
 
-    mvn test
+    mvn test -DtrimStackTrace=false
 
 > Maven is available as a debian package: `apt install maven`
 

From 49ceb78239bbed2b090abbc98283d66dc94ab846 Mon Sep 17 00:00:00 2001
From: domi41 <dominique.merle.41@gmail.com>
Date: Fri, 24 Apr 2026 22:53:28 +0200
Subject: [PATCH 3/3] feat: support tallies with no ballots

---
 .../mj/MajorityJudgmentDeliberator.java          |  4 ++++
 .../mj/MajorityJudgmentDeliberatorTest.java      | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/main/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberator.java b/src/main/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberator.java
index 2d96201..584d20e 100644
--- a/src/main/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberator.java
+++ b/src/main/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberator.java
@@ -335,6 +335,10 @@ private Double adjustMeritToAffine(
             BigInteger amountOfJudges,
             int amountOfGrades
     ) {
+        if (maxMerit.compareTo(BigInteger.ZERO) == 0) {
+            return 0.0;
+        }
+
         double meritNormalized = (new BigDecimal(merit).divide(
                 new BigDecimal(maxMerit), 15, RoundingMode.HALF_EVEN
         )).doubleValue();
diff --git a/src/test/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberatorTest.java b/src/test/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberatorTest.java
index a6681ec..8fe2ff6 100644
--- a/src/test/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberatorTest.java
+++ b/src/test/java/fr/mieuxvoter/mj/MajorityJudgmentDeliberatorTest.java
@@ -628,6 +628,22 @@ public void execute() throws Throwable {
         assertTrue(caught, "An exception is raised");
     }
 
+    @Test
+    @DisplayName("Allow no ballots")
+    void testNoBallots() {
+        Integer amountOfJudges = 0;
+        DeliberatorInterface mj = new MajorityJudgmentDeliberator();
+        TallyInterface tally =
+                new Tally(
+                        new ProposalTallyInterface[]{
+                                new ProposalTally(new Integer[]{0, 0, 0}),
+                                new ProposalTally(new Integer[]{0, 0, 0}),
+                        },
+                        amountOfJudges
+                );
+        mj.deliberate(tally);
+    }
+
     // …
 
     /**