From c5028bca3d58a590ab7f290a7c7c20d9ec0f3f05 Mon Sep 17 00:00:00 2001
From: Havoc Pennington <hp@pobox.com>
Date: Tue, 13 Dec 2011 18:33:59 -0500
Subject: [PATCH] Throw BugOrBroken if a ValidationFailed is created with no
 problems

Reported by Max in blog comments, thanks.
---
 config/src/main/java/com/typesafe/config/ConfigException.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config/src/main/java/com/typesafe/config/ConfigException.java b/config/src/main/java/com/typesafe/config/ConfigException.java
index ef8b2d13..b8dcb8ca 100644
--- a/config/src/main/java/com/typesafe/config/ConfigException.java
+++ b/config/src/main/java/com/typesafe/config/ConfigException.java
@@ -339,6 +339,9 @@ public abstract class ConfigException extends RuntimeException {
                 sb.append(p.problem());
                 sb.append(", ");
             }
+            if (sb.length() == 0)
+                throw new ConfigException.BugOrBroken(
+                        "ValidationFailed must have a non-empty list of problems");
             sb.setLength(sb.length() - 2); // chop comma and space
 
             return sb.toString();