1 files changed, 11 insertions, 6 deletions
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidationException.java b/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidationException.java
index 24ff37963c..bffe382d89 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidationException.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/git/validators/CommitValidationException.java
@@ -14,30 +14,35 @@
 
 package com.google.gerrit.server.git.validators;
 
+import com.google.common.collect.ImmutableList;
 import com.google.gerrit.server.validators.ValidationException;
-import java.util.Collections;
 import java.util.List;
 
 public class CommitValidationException extends ValidationException {
   private static final long serialVersionUID = 1L;
-  private final List<CommitValidationMessage> messages;
+  private final ImmutableList<CommitValidationMessage> messages;
+
+  public CommitValidationException(String reason, CommitValidationMessage message) {
+    super(reason);
+    this.messages = ImmutableList.of(message);
+  }
 
   public CommitValidationException(String reason, List<CommitValidationMessage> messages) {
     super(reason);
-    this.messages = messages;
+    this.messages = ImmutableList.copyOf(messages);
   }
 
   public CommitValidationException(String reason) {
     super(reason);
-    this.messages = Collections.emptyList();
+    this.messages = ImmutableList.of();
   }
 
   public CommitValidationException(String reason, Throwable why) {
     super(reason, why);
-    this.messages = Collections.emptyList();
+    this.messages = ImmutableList.of();
   }
 
-  public List<CommitValidationMessage> getMessages() {
+  public ImmutableList<CommitValidationMessage> getMessages() {
     return messages;
   }