From d20e4f53af58315f2d7d79c235c90b3e76717607 Mon Sep 17 00:00:00 2001
From: emopers <emopers@gmail.com>
Date: Wed, 9 Jan 2019 03:35:27 -0600
Subject: [PATCH] [LANG-1476] Added sync for iterating over synced set

---
 src/main/java/org/apache/commons/lang3/CharSet.java | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/main/java/org/apache/commons/lang3/CharSet.java b/src/main/java/org/apache/commons/lang3/CharSet.java
index 21e7e175f..3fdfd07d8 100644
--- a/src/main/java/org/apache/commons/lang3/CharSet.java
+++ b/src/main/java/org/apache/commons/lang3/CharSet.java
@@ -237,9 +237,11 @@ protected void add(final String str) {
      * @return {@code true} if the set contains the characters
      */
     public boolean contains(final char ch) {
-        for (final CharRange range : set) {
-            if (range.contains(ch)) {
-                return true;
+        synchronized(set) {
+            for (final CharRange range : set) {
+                if (range.contains(ch)) {
+                    return true;
+                }
             }
         }
         return false;